Spectral and Spatial Features of Radiation Emitted by a Cholesteric Liquid-Crystal Laser

Authors

  • I. P. Ilchyshyn Institute of Physics, Nat. Acad. Sci. of Ukraine
  • E. A. Tikhonov Institute of Physics, Nat. Acad. Sci. of Ukraine
  • T. V. Mykytiuk Institute of Physics, Nat. Acad. Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe63.4.339

Keywords:

cholesteric liquid crystal, planar texture, lasing spectra, spatial mode structure

Abstract

Spectral and spatial characteristics of radiation emitted by a laser operating on the Bragg structure arising in cholesteric liquid crystals (CLCs) have been studied, as well as their variations with a change of the planar CLC orientation. A defect in the helical structure of the CLC formed by a ternary mixture of cholesterol viscous esters is revealed at the mutually orthogonal orientations of the CLC director at the substrates. This defect manifests itself as a local dip in the selective reflection band, which agrees with the behavior of the defect mode in the photonic crystal. Such a defect in the helical structure stimulates the selection of longitudinal modes with the indices N = ±1, so that the single-mode lasing regime is realized. A spatial ring structure in the laser radiation is found to arise, when higher longitudinal modes are generated.

UJP 2018 V63 #4

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Published

2018-06-18

Issue

Vol. 63 No. 4 (2018)

Section

Liquid crystals and polymers

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How to Cite

Spectral and Spatial Features of Radiation Emitted by a Cholesteric Liquid-Crystal Laser. (2018). Ukrainian Journal of Physics, 63(4), 339. https://doi.org/10.15407/ujpe63.4.339

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