Intracavity measurement of liquid crystal layer thickness by wavelength tuning of an external cavity laser diode

The gap of a planar-aligned liquid crystal (LC) cell is measured by a novel method: Monitoring the change in output wavelength of an external-cavity diode laser by varying the voltage driving the LC cell placed in the laser cavity. This method is particularly suitable for measurement of LC cells of...

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Bibliographic Details
Published in:Optics express 2005-10, Vol.13 (20), p.7905-7912
Main Authors: Lan, Yu-Ping, Lin, Yea-Feng, Li, Yu-Tai, Pan, Ru-Pin, Lee, Chao-Kuei, Pan, Ci-Ling
Format: Article
Language:English
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Summary:The gap of a planar-aligned liquid crystal (LC) cell is measured by a novel method: Monitoring the change in output wavelength of an external-cavity diode laser by varying the voltage driving the LC cell placed in the laser cavity. This method is particularly suitable for measurement of LC cells of small phase retardation. Measurement errors of +/-0.5 % and +/-0.6 % for 9.6-microm and 4.25-microm cells with phase retardations of 1.63 microm and 0.20 microm respectively are demonstrated.
ISSN:1094-4087
1094-4087
DOI:10.1364/OPEX.13.007905