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Optical Engineering

Fine-tuning of a diode laser wavelength with a liquid crystal intracavity element
Author(s): Yu-Pin Lan; Chao-Yuan Chen; Ru-Pin Pan; Ci-Ling Pan
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Paper Abstract

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.

Paper Details

Date Published: 1 January 2004
PDF: 5 pages
Opt. Eng. 43(1) doi: 10.1117/1.1629684
Published in: Optical Engineering Volume 43, Issue 1
Show Author Affiliations
Yu-Pin Lan, National Chiao Tung Univ. (Taiwan)
Chao-Yuan Chen, National Chiao Tung Univ. (Taiwan)
Ru-Pin Pan, National Chiao Tung Univ. (Taiwan)
Ci-Ling Pan, National Chiao Tung Univ. (Taiwan)

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