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Proceedings Paper

Transient nematic liquid crystal modulator as an active Q-switch for solid state lasers
Author(s): Ignatius Iryanto; Hans Joachim Eichler; D. Grebe; Rainer Macdonald
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Paper Abstract

Recently, fast electro-optical switching in planar nematic liquid crystals using Multipass and also Fabry-Perot modulators has been reported. By applying short driving- voltage pulses of 150 V microsecond switching times have been achieved with nematic planar cells (NPC) and even sub- microsecond switching in case of nematic Fabry-Perot modulators (NFPM). In the present report the performance of these modulators depending on the thickness, the temperature, the amplitude and the width of driving pulsed voltage is discussed with respect to realization of nematic Q-switch modulators for solid state lasers. A special ITO-electrode configuration has been developed to minimize the electrical time constant of the modulators. Results of using those fast nematic modulators as active Q-switches in flash lamp pumped Nd:YAG solid state lasers are shown. Three different resonator configurations have been designed. The realized Q-switch lasers emit pulses of 40 - 70 ns duration (FWHM) and energies between 10 - 25 mJ.

Paper Details

Date Published: 24 October 2000
PDF: 7 pages
Proc. SPIE 4107, Liquid Crystals IV, (24 October 2000); doi: 10.1117/12.405319
Show Author Affiliations
Ignatius Iryanto, Trisakti Univ. (Indonesia)
Hans Joachim Eichler, Technical Univ. of Berlin (Germany)
D. Grebe, Technical Univ. of Berlin (Germany)
Rainer Macdonald, Physikalisch-Technische Bundesanstalt (Germany)


Published in SPIE Proceedings Vol. 4107:
Liquid Crystals IV
Iam-Choon Khoo, Editor(s)

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