Mode-hop-free fine tuning of an external-cavity diode laser with an intracavity liquid crystal cell.
A planar nematic liquid crystal (NLC) cell is incorporated into a Littman-type external cavity as the wavelength-tuning device for a semiconductor laser diode. By varying the driving voltage of the NLC cell and laser diode bias current simultaneously, we demonstrate single-mode oscillation and mode-hop-free tuning over 19.2 GHz at 775 nm. The result is in good agreement with the theoretical predictions.
Institute of Electro-Optical Engineering and Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan.
Yu-Ping
YP
Lan
Ru-Pin
RP
Pan
Ci-Ling
CL
Pan