Semiconductor Lasers

Fine-tuning of a diode laser wavelength with a liquid crystal intracavity element

[+] Author Affiliations
Yu-Pin Lan

National Chiao Tung University, Institute of Electro-Optical Engineering, Hsinchu, Taiwan?30050

Chao-Yuan Chen

National Chiao Tung University, Institute of Electro-Optical Engineering, Hsinchu, Taiwan?30050

Ru-Pin Pan

National Chiao Tung University, Department of Electrophysics, Hsinchu, Taiwan?30050

Ci-Ling Pan

National Chiao Tung University, Institute of Electro-Optical Engineering, Hsinchu, Taiwan?30050 E-mail: clpan@mail.nctu.edu.tw

Opt. Eng. 43(1), 234-238 (Jan 01, 2004). doi:10.1117/1.1629684
History: Received Apr. 30, 2003; Revised Jun. 20, 2003; Accepted Jun. 26, 2003; Online February 06, 2004
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A novel and simple approach for fine-tuning a laser wavelength is proposed and demonstrated. The key element is a planarly aligned nematic liquid crystal (NLC) cell inserted between the grating and end mirror of an external-cavity semiconductor laser (ECL). Varying the voltage driving the NLC cell, causes its extraordinary index of refraction to change due to field-induced reorientation of the LC director. This is equivalent to tuning the laser cavity length. As a result, the laser wavelength can be continuously tuned. With a 35.5-μm-thick NLC cell, the output frequency of the present laser can be continuously tuned over 4 GHz. The root mean square driving voltage required is 1.5 V or less. The tuning range is in good agreement with the theoretical predictions. © 2004 Society of Photo-Optical Instrumentation Engineers.

© 2004 Society of Photo-Optical Instrumentation Engineers

Citation

Yu-Pin Lan ; Chao-Yuan Chen ; Ru-Pin Pan and Ci-Ling Pan
"Fine-tuning of a diode laser wavelength with a liquid crystal intracavity element", Opt. Eng. 43(1), 234-238 (Jan 01, 2004). ; http://dx.doi.org/10.1117/1.1629684


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