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Opt Express. 2002 Sep 09;10(18):965-71. doi: 10.1364/oe.10.000965.

Performances of a polymer-cholesteric-liquidcrystal output-coupler in Nd-doped fiber lasers.

Optics express

Belkacem Meziane, Chuin Li, Pierre Carette, Marc Warenghem, Michel Mitov

PMID: 19451951 DOI: 10.1364/oe.10.000965

Abstract

The performances and characteristics of a polymer-cholestericliquid-crystal reflector, used as an output coupler in a Nd-doped fiber laser, are presented. We show that a judicious combination of a linear polarizer and a quarter wave plate with the cholesteric coupler allows for a continuous scanning of the output-intensity from zero to a maximum value following the well-known Malus law. The results are shown to be contained in a simple Jones Matrix formalism. The LP-QW-PCLC combination is characterized by a reflection coefficient that can be freely adjusted from 0 to 1 by a simple rotation of the quarter-wave plate.

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