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Proceedings Paper

Ultra-low threshold lasing in silica whispering-gallery-mode microcavities with Nd3+:Gd2O3 nanocrystals
Author(s): Guoping Lin; Olivier Tillement; Yves Candela; Matteo Martini; Zhiping Cai; Valérie Lefèvre-Seguin; Jean Hare
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Paper Abstract

The laser performances of silica microspheres functionalized by neodymium doped gadolinium oxide nanocrystals are investigated. First, we have developed a new method to identify and selectively excite small mode volume WGMs using a tapered fiber coupler. The electromagnetic-field distribution ofWGMs is mapped by the excitation efficiency, providing a measurement of the near field intensity. Moreover a method to characterize the ultra-low threshold microlaser is presented here, which relies on the use of the thermal bistability effect: the thermal drift of the resonance line which slows down the power scanning help us to detect the onset of laser effect on the emitted light. Finally, a single mode lasing at 1088.2 nm with threshold as low as 65 nW is achieved, for a quality factor at lasing wavelength of 1.4 × 108.

Paper Details

Date Published: 13 May 2010
PDF: 8 pages
Proc. SPIE 7716, Micro-Optics 2010, 771622 (13 May 2010); doi: 10.1117/12.853915
Show Author Affiliations
Guoping Lin, Lab. Kastler Brossel, École Normale Supérieure, UPMC, CNRS (France)
Xiamen Univ. (China)
Olivier Tillement, LPCML, Univ. Claude Bernard Lyon 1 (France)
Yves Candela, Lab. Kastler Brossel, École Normale Supérieure, UPMC, CNRS (France)
Matteo Martini, LPCML, Univ. Claude Bernard Lyon 1 (France)
Zhiping Cai, Xiamen Univ. (China)
Valérie Lefèvre-Seguin, Lab. Kastler Brossel, École Normale Supérieure, UPMC, CNRS (France)
Jean Hare, Lab. Kastler Brossel, École Normale Supérieure, UPMC, CNRS (France)


Published in SPIE Proceedings Vol. 7716:
Micro-Optics 2010
Hugo Thienpont; Peter Van Daele; Jürgen Mohr; Hans Zappe, Editor(s)

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