Submicrosecond switching with a Fabry–Perot interferometer containing a nematic liquid crystal

A polarization-insensitive, electrically tunable Fabry-Perot filter (FP) with a nematic liquid crystal (NLC) is demonstrated in an axially symmetrical configuration. Due to the axial symmetry, the wavelength-selection property of the FP filter is completely independent of the polarization state of the input beam in the whole range of tuning. For normal incidence, the in-plane symmetry of the input polarization state is preserved in such configuration that the alignment of the NLC molecules are homeotropic on one mirror surface and axially homogeneous on the other surface.

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Active Q-Switching of a Solid State Laser Using Nematic Liquid Crystal Modulators

Eichler

Grebe

Iryanto

et al. 1998

Molecular Crystals and Liquid Crystals Science and Technology.

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Fast electro-optical switching with planar nematic liquid crystals in multipass and also Fabry-Perot modulators has been realized. By using short driving pulses of 150V, we achieved microsecond switching times for nematic planar cells (NPC) and even sub micro-second switching in case of nematic Fabry-Perot modulators (NFPM), which have been applied as active Q-switches in Nd:YAG solid state lasers. Four different resonator configurations have been investigated. Typically, giant pulses of 35-70 ns duration (FWHM) with energies between 10-25 mJ are emitted. A rather plain Q-switch resonator design consists of only two optical components: a cholesteric liquid crystal polarizing mirror and a reflecting nematic liquid crystal modulator.

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Submicrosecond switching with a Fabry–Perot interferometer containing a nematic liquid crystal

Abstract: Novel electrooptic effect associated with a homeotropic to twisted-planar transition in nematic liquid crystals

Cited by 3 publications

References 16 publications

Passive laser Q-switching using a dye-doped liquid-crystalline layer near total internal reflection

Passive laser Q-switching using a dye-doped liquid-crystalline layer near total internal reflection

Polarization-insensitive wavelength selection in an axially symmetric liquid-crystal Fabry-Perot filter

Active Q-Switching of a Solid State Laser Using Nematic Liquid Crystal Modulators

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