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Proceedings Paper

Wavelength tuning and multiple-wavelength generation using a reflection-type liquid crystal spatial light modulator
Author(s): Ru-Pin Pan; Chia-Reung Shieu; Wen-Li Lu; Ming-Jay Huang; Ci-Ling Pan
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Paper Abstract

A reflection-type spatial light modulator using twisted nematic (TN) liquid crystal (the liquid crystal pixel mirror or LCPM) is employed to realize a new type of digitally tunable, narrow line-width (less than 0.1 nm, instrument-limited), multi-wavelength semiconductor laser. The laser is based on a novel folded telescopic grating-loaded external cavity with LCPM at the focal plane of the folded telescope. With a 50-pixel LCPM, the single wavelength digitally tunable range of a visible laser diode was from 650.8 to 661.24 nm in 0.21 nm steps by biasing the individual pixels. Further, the wavelength can be switched and reset with a response time of 13.6 ms. By biasing two pixels at the same time, obtain dual-wavelength output with the wavelength tunable from 0.21 to 10.4 nm. Generation of tunable triple wavelengths with equal or arbitrary wavelength separation are also demonstrated. Preliminary results on such a laser operating at 1550 nm is also shown.

Paper Details

Date Published: 8 November 2001
PDF: 4 pages
Proc. SPIE 4457, Spatial Light Modulators: Technology and Applications, (8 November 2001); doi: 10.1117/12.447745
Show Author Affiliations
Ru-Pin Pan, National Chiao Tung Univ. (Taiwan)
Chia-Reung Shieu, National Chiao Tung Univ. (Taiwan)
Wen-Li Lu, National Chiao Tung Univ. (Taiwan)
Ming-Jay Huang, National Chiao Tung Univ. (Taiwan)
Ci-Ling Pan, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 4457:
Spatial Light Modulators: Technology and Applications
Uzi Efron, Editor(s)

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