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Proceedings Paper

Detection of coherent tunable THz-wave using of stimulated polariton scattering in MgO:LiNbO3
Author(s): Ruixiang Guo; Tomofumi Ikari; Hiroaki Minamide; Hiromasa Ito
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Paper Abstract

We report the experimental results of generation and coherent detection of narrow linewidth tunable terahertz radiation at room temperature utilizing a difference frequency generation as a result of stimulated scattering in the nonlinear crystal of MgO:LiNbO3. The terahertz radiation was generated from an all-solid-state tunable injection-seeded THz-wave parametric generator (is-TPG), which emits the monochromatic THz-wave over a wide tunable frequency range from 0.6 THz to 2.4 THz with the linewidth of narrower than 100 MHz. Mixing of terahertz radiation (frequency &ohgr;T ) with a near-infrared intense pump pulse (frequency &ohgr;P ) results in the excitation and amplification of the difference frequency component with frequency &ohgr;i =&ohgr;P -&ohgr;T, which is detected with a InGaAsbased photodiode. We demonstrate this method a fast response and very sensitive THz-wave detection running at room temperature, which is at least three of magnitude faster and two of magnitude more sensitive than a typical Liquid-He cooling Si bolometer for detecting the quasi-cw THz-wave beam. This detection technique is possible for coherent detection, it can measure the THz electric field, not only the intensity. As a result, the phase information is preserved, the real and imaginary parts of a sample's dielectric function may be determined simultaneously with this detection.

Paper Details

Date Published: 8 May 2007
PDF: 8 pages
Proc. SPIE 6582, Nonlinear Optics and Applications II, 65820Z (8 May 2007); doi: 10.1117/12.722990
Show Author Affiliations
Ruixiang Guo, RIKEN Sendai (Japan)
Tomofumi Ikari, RIKEN Sendai (Japan)
Hiroaki Minamide, RIKEN Sendai (Japan)
Hiromasa Ito, RIKEN Sendai (Japan)
RIEC Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 6582:
Nonlinear Optics and Applications II
Mario Bertolotti, Editor(s)

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