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8 November 2001 Wavelength tuning and multiple-wavelength generation using a reflection-type liquid crystal spatial light modulator
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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.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ru-Pin Pan, Chia-Reung Shieu, Wen-Li Lu, Ming-Jay Huang, and Ci-Ling Pan "Wavelength tuning and multiple-wavelength generation using a reflection-type liquid crystal spatial light modulator", Proc. SPIE 4457, Spatial Light Modulators: Technology and Applications, (8 November 2001); https://doi.org/10.1117/12.447745
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