Statistics – Applications
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4457..111p&link_type=abstract
Proc. SPIE Vol. 4457, p. 111-114, Spatial Light Modulators: Technology and Applications, Uzi Efron; Ed.
Statistics
Applications
1
Scientific paper
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.
Huang Ming-Jay
Lu Wen-Li
Pan Ci-Ling
Pan Ru-Pin
Shieu Chia-Reung
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