Lasing in Dye-Doped Nematic Liquid Crystals at a Dynamic Distributed Feedback for Two-Scheme Excitation

Abstract

The lasing of a dye doped nematic liquid crystal (NLC) under the dynamic distributed feedback (DFB) recorded in NLC for two-scheme pumping is considered. Estimations of the contribution of the amplitude and phase gratings to the forward-backward wave interaction in the arising periodic structure are made. The narrow frequency tunable emission against the background wide spectrum of the superluminescence is gained, by manifesting the oscillation under DFB. The spectral characteristics of some dyes in NLC important for lasing has been studied and tested under laser pumping. The obtained experimental results give a positive credit to the selected approach.

Keywords:

• distributed feedback
• dye
• frequency tuning
• lasing
• nematic LC

Acknowledgments

We acknowledge our colleagues L.A. Dolgov and R.M. Kravchuk for making the NLC oriented layers on a TIR-prism and a mirror cell used in experiments.