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Doubling the optical efficiency of a chiral liquid crystal laser using a reflector

2005; American Institute of Physics; Volume: 87; Issue: 23 Linguagem: Inglês

10.1063/1.2138353

1520-8842

Ying Zhou, Yuhua Huang, Alexandra Rapaport, Michael Bass, Shin‐Tson Wu,

Plant and animal studies

A simple method for doubling the laser emission efficiency of Nd:yttrium-aluminum-garnet pumped cholesteric liquid crystal (CLC) photonic band edge lasers is demonstrated. By adding a mirror or a CLC reflector behind the dye-doped CLC cell, the lasing intensity is nearly doubled. For the mirror reflector, due to the mixing of right-handed and left-handed circular polarizations, the output laser is basically unpolarized. However, for the CLC reflector, a partially coherent laser can be built in which either right-handed or left-handed circularly polarized laser could dominate the output, depending on the handedness of the cholesteric structure.