This PDF file contains the front matter associated with SPIE Proceedings Volume 8772, including the Title Page, Copyright information, Table of Contents, and the Conference Committee listing.

Here we present the measurements of the second harmonic generation (SHG) signal raised by self ordered dielectric nanospheres partially covered by thin (10nm) Au layer. The measurement were performed by studying the SHG efficiency in different polarization states of the light. In particular measurement performed with circular polarized light show the presence of chiral response of the nanospheres that is induced by the particular geometry of the metasurface.

In this work we report optical parametric generation in two dimensional, second order periodically poled lithium tantalate crystals. We are particularly interested by angular tuning of the conversion efficiency. We experimentally demonstrate that the generated intensity can be driven by the incidence angle of the pump beam. A double circle construction, different from the conventional Ewald sphere, is adopted to explain the quasi phase matching process.

Self-diffraction of two types has been discovered in the case of resonant excitation of excitons in CdSe/ZnS quantum dots (highly absorbing colloidal solution) by powerful beams of mode-locked laser with picosecond pulse duration. I. The bleaching of exciton transition provokes the creation of transparency channel and laser beam’s self-diffraction at the induced circular aperture. II. Self-diffraction arises for two laser beams intersecting in the cell with colloidal CdSe/ZnS quantum dots due to the induced transient diffraction grating. Nonlinear optical properties responsible for the observed self-action effects in CdSe/ZnS quantum dots are discussed and a method for estimating laser pulse duration is suggested.

We study spontaneous parametric down-conversion generating ultra-broadband biphotons in spatially chirped photoniclike crystals. The novelty is that these structures are considered as definite assembles of second-order layers with both linear and nonlinear chirping. It is shown that the biphoton spectra for two structures with linear and nonlinear chirps under consideration are essentially different in form.

A new design of aperiodic As2Se3-based chalcogenide photonic crystal fibers (PCF) is proposed in order to obtain broadband, mid-IR, and coherent supercontinuum (SC) sources. The proposed fibers possess an ultra-flattened dispersion curve over a wide wavelength range. The significance of this work is that it provides a new type of midinfrared SC source with flat shape, broadband and high coherence properties by femtosecond pumping the As2Se3-based PCF. The generated SC in the designed fibers cover a broadband range extending from 2 μm to more than 8 μm with a low input energy of 120 pJ and a short fiber length of 16 mm. In this context, many applications can be performed such as fiber lasers, pulse compression and multi-wavelength optical sources in the mid-infrared region.

In this work we present the study of nonlinear optical properties of Au nanoparticles suspended in different solutions, using the z-scan technique. Thermal lens model and Shiek-Bahae formalism were used to determine the nonlinear properties. Parameters as the sign and nonlinear refractive index n₂ , nonlinear absorption coefficient (β) and dn/dt were found. Analyses of changes in these parameters using different solutions with the same concentration of Au nanoparticles are shown.

We developed a semiclassical theory of polariton excitations for the Λ-scheme of interaction realized in an yttrium orthosilicate crystal doped with Pr ⁵⁹ atoms. The threshold optical pump power for efficient amplification of the probefield polaritons in a medium consisting of three-level atoms is determined. At the near-threshold conditions in the system the appearance of strong non-classical correlations (entanglement) between light and dark polaritons, similar to generation of biphotons in optics is predicted.

A mechanism of creating a Newton's cradle (NC) in the form of a chain of solitons is proposed for understanding fission of higher-order soliton in optical fibers caused by higher-order dispersion. After the transformation of the initial Nsoliton into a chain of fundamental quasi-solitons, the tallest one travels along the chain through elastic collisions with other solitons, and then escapes, while the other solitons remain in a bound state. Multiple releases of solitons take place if N is sufficiently large. The NC effect is robust against inclusion of the Raman and self-steepening terms.

We consider the problem of formation and propagation of optical vortex solitons in hollow-core optical fibres filled with a cold atomic gas for the case of the Raman regime in the Λ-scheme of interaction subject to the Lorentz local field effects and in the presence of optical and atomic perturbations. We shows that the coherent optical control by pump beam in such an atomic medium leads to effective development of dynamical equilibrium of diffraction, nonlinear and dissipative processes necessary to stabilize dissipative vortex solitons. We demonstrate that the generation of acoustic waves even with small amplitudes in the fiber can quickly destroy the soliton mode.

In this paper we treat electron distributions produced in high intensity X-ray laser experiments and compare the behaviour of the sample assuming thermalization or following the non-equilibrium distribution at densities well below that of the solid.

In this work, we present experimental results on an optoelectronic resonator (OEO) based on intensity modulation and a high-Q disk resonator. In our configuration, the crystalline whispering-gallery-mode resonator acts both as a frequency filter, selecting the microwave oscillating frequency, and as an optical storage element. In such a system, the oscillating frequency corresponds to the free spectral range of the resonator (between 10 GHz and 11 GHz), and therefore no delayinduced spurious peaks are present in the spectrum, in contrast to the case of the classical optoelectronic oscillator where the storage element consists of an optical fiber delay line. An other advantage of our system resides in its compactness allowing for efficient control of the temperature.

We simulated propagation of few-cycle femtosecond pulses in fused silica fiber based on the set of first-order equations for forward and backward waves that generalizes widely used equation of unidirectional approximation. Appearance of a weak reflected field in conditions default to the unidirectional approach is observed numerically. It arises from nonmatched initial field distribution with the nonlinear medium response. Besides additional field propagating forward along with the input pulse is revealed. The analytical solution of a simplified set of equations valid over distances of a few wavelengths confirms generation of reflected and forward-propagating parts of the backward wave. It allowed us to find matched conditions when the reflected field is eliminated and estimate the amplitude of backward wave via medium properties. The amplitude has the order of the nonlinear contribution to the refractive index divided by the linear refractive index. It is small for the fused silica so the conclusions obtained in the unidirectional approach are valid. The backward wave should be proportionally higher in media with stronger nonlinear response. We did not observe in simulations additional self-reflection not related to non-matched boundary conditions.

Dispersion engineering in integrated silicon nitride waveguides is numerically and experimentally investigated. We show that by modifying the transversal dimensions of the silicon nitride core, it is possible to have a good control of the chromatic dispersion. The inaccuracies due to typical fabrication process in PECD-Si_XN_Y films shows that the dispersion uncertainty is in the order of 20 ps/nm-km at 1550 nm. Silicon nitride waveguides were then fabricated using the same PECVD process and the chromatic dispersion was measured using a low-coherence frequency domain interferometry technique. A comparison between measurements and simulations shows good agreement.

In this paper we investigate the nonlinear and polarization effects in optical transmission systems and its influence on transmitted pulses. The main attention is focused on fundamental description of refractive index in nonlinear birefringent environment. In general, optical fiber is nonlinear transmission medium. The mutual interaction between transmission medium and optical intensity induces changes in the refractive index resulting to nonlinear effects that can be polarization-dependent in presence of birefringence. The global effect has a significant impact on pulse propagation. The aim of this paper is to present a numerical model, which will be suitable for estimation of DGD (Differential Group Delay) parameter in nonlinear birefringence medium. The DGD is crucial for evaluation of the impact of PMD (Polarization Mode Dispersion) in high-bit-rates fiber-optic system. Our approach opens the novel opportunity for DGD estimation based on numerical model of optical pulse propagation in nonlinear birefringence medium. Numerical model is based on solving NLSE (Nonlinear Schrodinger Equation) through the SSFM (Split-Step Fourier Method). The model is compatible for various input parameters, different kinds of optical fibers and also for different types of modulation formats. The obtained results show the DGD for different system parameters (such as input power and wavelength) and for different fiber polarization characteristics (birefringence and mode coupling). The total pulse broadening is also calculated and illustrates how all degradation effects influence the performance of fiber-optic transmission system.

Single longitudinal-mode Brillouin fiber lasers are very promising for many applications, such as coherent optical communication, interferometric sensing, coherent radar detection, and microwave photonics. In the lasers with doublyresonant cavities Stokes wave is generated by a short fiber ring cavities that are simultaneously resonant for pump and Stokes radiation. Therefore, such lasers emit coherent light in two laser lines separated by the Brillouin shift. We report a simple procedure allowing precise adjustment of the Brillouin fiber ring cavities for doubly-resonant operation and demonstrate two completely passive solutions enabling perfect stabilization of such cavities for generation of doublefrequency light. In our experiments, the first laser configuration is stabilized through self-injection locking mechanism implemented to the laser cavity with DFB semiconductor pump laser. Second configuration comprises a nonlinear fiber mirror based on the population inversion dynamical gratings induced in low-absorbed Er-doped fiber. The pump-to- Stokes conversion efficiency of ~40% in both cases and the Stokes linewidth of <500Hz for the first case and < 100Hz for the second are successfully demonstrated.

The chirped multilayer quantum-dot (QD) gain media are arranged in Fourier-transform external-cavity laser (FT-ECL) configuration. Novel slit designs select 2, 3, and 4 different wavelengths that are diffracted from the grating for optical feedback. Therefore, the dual-, triple- and quadruple-wavelength ECLs are demonstrated in this study. The resulted multi-wavelength lasing emissions are achieved under injected current of 100 mA (or 1.33 kA/cm²) with signal to amplified spontaneous emission (ASE) ratio over 20 dB. Around peak-gain wavelength of 12xx-nm range, the adjacent wavelength separation is over 50 nm for dual-wavelength lasing, up to 13 nm for triple-wavelength lasing, and about 4-5 nm for quadruple-wavelength lasing emissions. To further extend the wavelength separation for dual-wavelength lasing emissions, another modified scheme with two separate external mirrors are adopted and the achieved maximum value is about 126 nm in wavelength separation or over 25 THz in frequency difference. The terahertz (THz) generation by photomixing of dual-wavelength ECLs is also discussed in this study.

We introduce an analytical approach to the description of broadband lasing spectra of semiconductor quantum dot lasers emitting via ground-state optical transitions of quantum dots. The explicit analytical expressions describing the shape and the width of lasing spectra as well as their temperature and injection current dependences are obtained in the case of low homogeneous broadening. It is shown that in this case these dependences are determined by only two dimensionless parameters, which are the dispersion of the distribution of QDs over the energy normalized to the temperature and loss-to-maximum gain ratio. The possibility of optimization of laser’s active region size and structure by using the intentionally introduced disorder is also carefully considered.

The Al Nano apertures surrounded by periodic patterns on the pyramidal structures were fabricated. The nanometric size aperture with ~ 100 nm diameter surrounded by equidistant elliptic groove patterns presented greater transmission than the aperture with circular groove patterns. The translocation of λ-DNA through these fabricated nanostructures was tested using electrically biased techniques. We observed the strong fluorescent optical signal from the translocated DNA through the nanoprobe with a charge coupled device camera. The optical force driven DNA translocation though a nanoprobe surrounded with elliptically patterned grooves is under investigation.

On the base of computer simulation, we investigated a propagation of femtosecond laser pulse in a linear medium with time-dependent dielectric permittivity. We showed that in dependence on the relation between carrier frequency of wave package and the modulation frequency of a medium the various phenomena take place: frequency conversion, instability. We analyze two cases: dielectric permittivity modulation is unlimited during time or the modulation is limited during time. We show that for incident laser pulse with a few cycles the influence of its absolute phase is strong. For such incident pulse, a high enrichment of a spectrum of the laser pulse, propagated in a medium with time-dependent dielectric permittivity, takes place. This enrichment may be similar to the spectrum enrichment if a perturbation of the dielectric permittivity occurs unlimited during time. We believe that considering scheme of laser pulse interaction with medium can be used in data processing by optical methods, for example.

Current optical communication systems have been usually deployed in different physical environments. All environmental conditions have different physical characteristics that can significantly influence transmission properties of these systems. In this article, we focus on possible temperature effects on the refractive indices of optical fibers and their transmission characteristics. The article also attempts to determine the impact of thermal effects caused by the propagation of optical radiation through optical fiber. We discuss the impact of the stochastic changes in susceptibilities and consequently nonlinear effects occurring in optical fibers and influencing the propagation of optical pulses. As input pulses the Gaussian pulses of intensities exceeding intensities of atomic electric fields in the fibers have been taken into account. For such pulses the refractive index changes can become nonlinear, especially in case when considerable environmental changes of temperature can occur. The numerical studies of the pulse propagations in such nonlinear environmental conditions have been performed in this article. Stochastic changes in temperature lead to changes in the phase shift which can influence the spreading of the pulse spectrum due to SPM. The aim is to simulate the final effect at pulse shape and spectrum of propagated Gaussian pulses.

Two-photon absorption initiating crosslinking of diacrylate mesogen RM257 has been studied. Two-photon absorption process in the diacrylate mesogen is trigged by a low-power continuous laser irradiation at 632.8 nm wavelength. In order to manipulate the diacrylate mesogen to contain local structures, a thin layer of RM257 was exposed to a holographic irradiation produced by means of two-beam interferometry, in which the two coherent beams were provided by a HeNe laser. The holography irradiation acts double as the optical source that provides energy to produce freeradicals for initiating the crosslinking of the acrylate units and the driving force for the alignment of mesogenic groups in the diacrylate mesogen. The regions in the resultant diacrylate polymer exposed to the constructive fringes are found to contain ordered polymer network whose mesogenic groups orient perpendicular to the polarization of the holographic field, whereas those regions exposed to the destructive fringes present isotropic polymer networks.

The aim of this work is to determine the uncertainty on phase noise results obtained by using a double delay line optoelectronic system operating at 1.55 μm wavelength and designed for microwave photonics applications. The use of cross-correlation increases the noise floor of the system. We present how the phase noise is determined and how the global uncertainty of this system is calculated according to the main guideline delivered by the Bureau International des Poids et Mesures (BIPM). Its leads to a global uncertainty better than 2 dB at 2 sigma.

Common optical fibers are randomly birefringent, and solitons formatting and traveling in them are randomly polarized. However it is desirable to have solitons with a well-defined polarization. We analyzed the two coupled propagation equations in a circularly birefringent fiber. Our equations include SPM, XPM and the soliton self frequency shift. In a difference of previously published works we consider the polarization dependence of the Raman amplification. We have found that the difference between perpendicular and parallel Raman gain results in energy transform from slow to fast circularly polarized component. We have shown this effect analytically and by a numerical simulation. For analytical consideration we performed a transformation of equations which reduces them to a form of perturbed Manakov task. The perturbation method gives us equations for evolution of the polarization state of pulse which show that in a circularly birefringent fiber the cross–polarization Raman term leads to unidirectional energy transfer from the slow circularly polarized component to the fast one. The magnitude of this effect is determined by the product of birefringence and amplitudes of both polarization components. Thus, solitons with any initial polarization state will eventually evolve stable circularly polarized solitons. We also made numerical analysis of two coupled nonlinear Shrödinger equations using a split-step Fourier method. The parameters of a standard fiber were used with delay between left- and right- circular polarizations of 1 ps/km that corresponds to circular birefringence in a fiber twisted by 6 turns/m. Numerical analysis confirms the analytical approximation. We analyzed also the polarization of solitons generated by modulation instability. We used a 30-ps, 40-W pulse with noise imposed on them at the fiber input. We found that polarization ellipticity of solitons is distributed randomly; however the average polarization ellipticity is closer to the circular than the polarization ellipticity of the input pulse. In experiment we used 220-m SMF-28 fiber twisted by 6 turns/m. The fiber was pumped by 1-ns pulse. We have found that at circular polarization of the input pulse solitons at the fiber output have polarizations close to the circular.

We implemented and compared three different quasi-phase-matching (QPM) frequency-doubling configurations for 1560nm laser of single pass, double pass and cascade by using of MgO:PPLN bulk crystals. Also a fiber-pigtailed MgO:PPLN waveguide is utilized in single-pass frequency doubling configuration in the case of low-power 1560nm fundamental wave (FW) laser. Employing the second-harmonic wave (SHW) output at 780nm and a rubidium (Rb) vapor cell, we also performed the modulation transfer spectroscopy (MTS). MTS is insensitive to the fluctuation of laser intensity and the temperature drift of atomic vapor cell, so it is a good choice for laser frequency stabilization against atomic hyperfine transition line. The laser frequency stability is significantly improved after being locked via MTS scheme compared with the free-running case.

We present here the broadband and parametric gain for tellurite/phospho-tellurite optical fiber by carefully engineering the chromatic dispersion for optical parametric amplifier. This optical parametric amplification with broad bandwidth promises significant solutions for wavelength division multiplexing (WDM) and advanced ultrafast optical telecommunication systems. The parametric gain has been obtained with inclusion of higher and even order dispersion parameters in phase-mismatching factor (Δβ). The results have been obtained for step index fiber (SI) and hybrid microstructured optical fiber (HMOF) with engineered chromatic dispersion, having one zero dispersion wavelength (ZDW) and two ZDWs. The HMOF with a core diameter of 1.1 μm and chromatic dispersions having two ZDWs at 1262 and 1559 nm provides broadest parametric gain bandwidth (280 nm). This broad bandwidth advents due to the high nonlinear coefficient of tellurite/phospho-tellurite hybrid microstructured optical fiber. The paper explores variation in dispersion parameters, supercontinuum spectra and bandwidth of the parametric gains for these fibers.

The interest toward strong electromagnetic confinement structures through the use of microcavities is of great interest, from both the fundamental understanding and the technological application sides. Here, we focus our attention to second order nonlinear processes inside such structures. From a basic point of view, electromagnetic confinement leads, physically, to the manipulation of vacuum field fluctuations and, formally, to an anomalous commutation relation [Ueda, M. and Imoto, N., "Anomalous commutation relation and modified spontanenous emission inside a microcavity," Phys. Rev. A, 50(1), 89-92 (1994)]. However, an attempt to probe the resulting anomaly with a beam splitter located inside a cavity is theoretically proved inadequate for this task. For this reason, parametric fluorescence (PF, parametric down conversion) and second harmonic generation (SHG) are considered as potential tools to probe vacuum field fluctuations in confinement structures. Indeed, it was recently showed that PF can be strongly intensified, by two orders of magnitude or more, when it occurs inside a high confinement (open) cavity. Therefore, PF could efficiently be used to probe the expected anomaly. Additionally, in consideration of the simplest possible experimental scheme to probe the anomaly and because it is generally admitted that SHG is the time reversal of degenerate parametric fluorescence, here our attention is also directed toward SHG. Formally, we show that the equations describing SHG and PF are not symmetrical regarding quantum noise. It turns out that, conversely to the case of PF, the intensification of vacuum field fluctuations tends to inhibit SHG. We interpret this result as due to the reduction of waves coherence induced by stronger quantum noise. In conclusion, albeit both processes could be used as probes to prove or disprove the realm of quantum anomalies, PF appears as a more convenient tool.

In this paper we present fabrication and characterization of the laboratory-designed Bragg fiber. The fiber consisted of a silica core with the diameter of 26 μm surrounded by 3 pairs of circular Bragg layers with a refractive index contrast up to 0.033. Spectral attenuation was measured using a halogen lamp source and the cut-back method resulting in the attenuation coefficient of 0.175 dB/m at 1064 nm. Experiments on high power laser radiation delivery were performed using a laboratory-designed passively mode-locked Nd:YAG laser system generating pulses with the duration of 20 ps and energy of 15 μJ at the wavelength of 1064 nm. The attenuation coefficient measurements resulted in a value of 0.168 ± 0.005 dB/m. The delivered beam spatial profile was detected in the far-field zone in the distance of ~1 cm from the fiber output face. The beam had a circular symmetry with almost Gaussian intensity profile. Bending losses were measured on 1-m long fiber segments using mandrels with different diameters. The bending losses were equal to zero at mandrel diameters greater than 50 mm. Decreasing the mandrel diameter, the bending losses were slightly increasing to a value of 3.6 dB/turn at the mandrel diameter of 8 mm. Stimulated Raman scattering in the fiber was also investigated. The Raman threshold intensity in the fiber core for a 1-m long fiber segment was 113 GWcm². In a 48-m long fiber, generation up to the 3^rd Stokes component was observed together with the spectral broadening up to 1650 nm.

In this study, the optical nonlinearity of LCs with cell substrates coated with gold-nanoparticle (AuNP) -doped PVA alignment layers were examined using the Z-scan technique. The results show that the nonlinear refractive index n2 of the sample is enhanced by the gold nanoparticles doped in the alignment layers, because of the thermal effect of the absorption by the surface of the sample through the localized surface plasmon resonance (LSPR) of the gold nanoparticles. As the concentration of AuNPs in the alignment layers of the LC sample increases, the thermal effect of the LSPR increases, and |n₂| observably increases. Furthermore, the self-defocusing effect (n₂<0) of the sample can be modulated by the application of an external voltage, and a self-focusing effect (n₂<0) can be observed when samples are illuminated by a high-intensity laser with the application of a high voltage. Therefore, the magnitude and the sign of n2 of the sample can be modulated by combining the applied electric field and the optical field.

A high-quality KTiOAsO4 (KTA) single crystal has been successfully synthesized employing the high temperature solution growth technique with rotating and pooling. The XPS valence-band spectra have been measured for pristine and the 1.5 keV Ar⁺ ion-bombarded thin (001)KTA plate cut from the crystal part that was without any optical inhomogeneities or domain boundaries. The present XPS measurements have revealed the existence of two O 2s subbands on the XPS spectrum of the pristine (001)KTA surface. It has been established that 1.5 keV Ar⁺ ion bombardment of the (001)KTA surface causes the complete elimination of the O 2s sub-band related to oxygen atoms involved in the formation of Ti–O–As bonds in KTA. In addition, the XPS results reveal that such a treatment leads to a significant decrease of the relative intensity of the XPS As⁵⁺ 3d core-level spectrum and causes the formation of the additional As⁰ 3d core-level spectrum in the topmost layer of the (001)KTA surface. The experimental data are compared to the results of the first-principles band-structure calculations of KTA.

Thin organic waveguiding layers are applied more and more frequently as optical components in novel optoelectronic devices. For development of such devices it is important to know the optical properties of the used waveguides. One of the most important parameters is optical propagation loss in the waveguide. In this paper we present optical propagation loss measurements in planar electro optical waveguides using travelling fiber method. Using this method attenuation coefficient α at 633 nm as a function of chromophore concentration for the first two guiding modes in the slab waveguide was determined.

We demonstrated multiwavelengths formation by utilising a combination of fibre ring laser, three fbgs and 20 m of photonic crystal fibre (PCF) with zero dispersion wavelength at 1040 nm. Although it characteristics efficiently interacts in 1040nm range lasers in efficiency of non linear effects, we determined to exploit four wave mixing (FWM) effect in generating multiwavelength at C band transmission window. Prior, the Erbium Doped Fiber Amplifier (EDFA) spectrum was performed in order to identify its performance and suitable FBG. Two FBGs at the end of C band amplification and one fibre Bragg grating (FBG) at gain spectrum are selected. The FBGs assigned are FBG 1, 2 and 3 with its own specifications (1530.47 nm and reflectivity 89.9%), (1561.42 nm and reflectivity 91.6%) and (1563.95 nm and reflectivity 96.7%) respectively. Through FWM effect, new wavelengths generated successfully at gain spectrum range 1530nm to 1540nm. These findings show, multiwavelengths able to be generated even though the separation between signals which are not consistent at lengths and far among each other able to induce by sufficient energy level. The findings give a valuable impact and prospective relevance towards sensors and optical communications.

We examine in detail the cyclic adiabatic population transfer methods for five-level diagrams in order to construct a four-bit universal reversible logic gate. We show that under certain conditions and sequence of turning on and off the laser pulses a five-level system may be reduced to an effective Λ-diagram.

The known crystal structures of borate compounds with general composition A^I ₂MIII ₂B₂O₇ (AI: Na, K, Cs, Rb) have been considered. The structures in space groups P63/m, P-3₁c, P321 and P21/c have been found depending on cation combination. Criterion k = (r(M^III)+r(B)+2r(O))/r(A^I) has been formulated and it controls the formation of trigonal K2Al2B2O7 (KABO) type structure. The existence of noncentrosymmetric KABO-type borates is possible over the range of k = 2.7 – 2.06. This range is promising for searching new borate crystals and solid solutions with pronounced nonlinear optical properties.

Laser-induced incandescence (LII) of carbon surface is investigated with 1.06 um YAG:Nd3+ pulsed laser excitation. The experiments show that the intensity of LII or carbon surface depends on the initial temperature of the investigated sample. A method is proposed for estimation of temperature of laser-heated surfaces. The method requires measurement of LII at a fixed wavelength with a moderate variation of initial sample temperature.

The сentimeter-sized GaSe crystals doped with 0.01, 0.05, 0.1, 0.2, 0.5, 1, 2 at.% of Al and 0.025, 0.1, 0.5, 1,2 at. % of Er have been grown by the modified Bridgman method with heat field rotation. The crystals have been studied in comparison with GaSe crystals doped with 0.1, 0.5, 1, 2, 3, 5, 7, 10.2 wt.% of S, 0.01, 0.1, 0.5, 1, 2, 3, 5 wt.% of In and 0.01, 0.1, 0.5, 1, 2 wt. % of Te grown by the conventional Bridgman method. The distribution coefficient of Al in the grown GaSe:Al (≥0.1 at.%) crystals has been estimated to be ∼8⋅10^-3 and it is within the range of 10^-2-10^-3 in Er-doped crystals. For the first time, the optimal doping levels have been estimated for Al and Er in GaSe as 0.01- 0.05 at.% for Al and ~ 0.5 wt.% for Er, respectively.