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Proceedings Paper

Hyper coherent linewidth control for a 30mW 405nm visible laser diode by delayed self-heterodyne beat
Author(s): Masahiro Matsumura; Toshiki Kuromori; Wakao Sasaki
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Paper Abstract

We have demonstrated a hyper coherent spectral linewidth evaluation for a frequency stabilized 405nm GaN violet laser diode (LD) based on the delayed self-heterodyne beat. The laser light source was stabilized to a reference confocal Fabry-Perot (CFP) cavity by negative electrical feedback to the injection current of the LD under the Pound-Drever-Hall technique. In addition, by introducing optical feedback from another tilted CFP cavity, the spectral linewidth has been efficiently narrowed. In this scheme, we have achieved 1.65×10-11 estimated with Allan variance for the feedback error signal from CFP cavity. We also measured the linewidth directly by a separate FP interferometer, which resulted in close coincidence with above Allan variance estimations. In this work, we have tried to measure our narrowed linewidth by the delayed self heterodyne technique which consists of optical fiber of about 1km~3km length to have delay time the light of our stabilized violet laser. In conclusion, we have achieved a practical and inexpensive linewidth control for a high power violet LD to attain hyper coherent conditions of the semiconductor lasers.

Paper Details

Date Published: 18 February 2011
PDF: 8 pages
Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79131C (18 February 2011); doi: 10.1117/12.874148
Show Author Affiliations
Masahiro Matsumura, Doshisha Univ. (Japan)
Toshiki Kuromori, Doshisha Univ. (Japan)
Wakao Sasaki, Doshisha Univ. (Japan)

Published in SPIE Proceedings Vol. 7913:
Laser Resonators and Beam Control XIII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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