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Lasing in liquid crystal thin films

Abstract

A lasing condition is formulated in matrix form for optically anisotropic thin films. Lasing behavior of liquid-crystal slabs is analyzed. In particular, it is shown that if the spatial extent of a liquid crystal slab is much larger than its thickness, then laser emission is feasible not only along the normal to the slab, but also in the entire angular sector. The generated laser light can be observed experimentally as a spot or as concentric rings on a screen. The lowest lasing threshold corresponds to in-plane sliding modes leaking into the substrate. The feedback required for lasing is provided by reflection from the interfaces, rather than edges, of the liquid-crystal slab operating as a planar Fabry-Perot cavity. For cholesteric liquid crystals, it is shown that energy loss to the sliding modes leaking into the substrates and escaping through their edges is a key factor that limits the efficiency of band-edge emission along the normal to the slab.
Authors:
Palto, S. P. , E-mail: palto@online.ru [1] 
  1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
Publication Date:
Sep 15, 2006
Product Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 103; Journal Issue: 3; Other Information: DOI: 10.1134/S1063776106090172; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; ENERGY LOSSES; FEEDBACK; LASERS; LIQUID CRYSTALS; PHOTON EMISSION; REFLECTION; SLABS; SUBSTRATES; THIN FILMS; VISIBLE RADIATION
OSTI ID:
21067632
Country of Origin:
United States
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1063-7761; JTPHES; TRN: US07L1185081701
Submitting Site:
INIS
Size:
page(s) 472-479
Announcement Date:
Sep 13, 2008

Citation Formats

Palto, S. P. , E-mail: palto@online.ru. Lasing in liquid crystal thin films. United States: N. p., 2006. Web. doi:10.1134/S1063776106090172.
Palto, S. P. , E-mail: palto@online.ru. Lasing in liquid crystal thin films. United States. doi:10.1134/S1063776106090172.
Palto, S. P. , E-mail: palto@online.ru. 2006. "Lasing in liquid crystal thin films." United States. doi:10.1134/S1063776106090172. https://www.osti.gov/servlets/purl/10.1134/S1063776106090172.
@misc{etde_21067632,
title = {Lasing in liquid crystal thin films}
author = {Palto, S. P. , E-mail: palto@online.ru}
abstractNote = {A lasing condition is formulated in matrix form for optically anisotropic thin films. Lasing behavior of liquid-crystal slabs is analyzed. In particular, it is shown that if the spatial extent of a liquid crystal slab is much larger than its thickness, then laser emission is feasible not only along the normal to the slab, but also in the entire angular sector. The generated laser light can be observed experimentally as a spot or as concentric rings on a screen. The lowest lasing threshold corresponds to in-plane sliding modes leaking into the substrate. The feedback required for lasing is provided by reflection from the interfaces, rather than edges, of the liquid-crystal slab operating as a planar Fabry-Perot cavity. For cholesteric liquid crystals, it is shown that energy loss to the sliding modes leaking into the substrates and escaping through their edges is a key factor that limits the efficiency of band-edge emission along the normal to the slab.}
doi = {10.1134/S1063776106090172}
journal = {Journal of Experimental and Theoretical Physics}
issue = {3}
volume = {103}
place = {United States}
year = {2006}
month = {Sep}
}