Manifestation of the Chiral Liquid Crystal Boundary Conditions in Lasing Features

Abstract

Spectral, thresholds and spatial characteristics of lasing in dye-doped chiral liquid crystals (CLC) of steroidal - type for parallel and perpendicular orientation of directors on the substrates are studied. The observed improvements of lasing parameters can be supposedly explained by appearance of the helical structure defect. Corresponding details of theoretical analysis in the frame of the similar model is presented. The observed lasing behavior of CLC with orthogonal director orientation occurs to be similar to predicted ones in the theory for the oscillation on the defect mode in the presence of phase defect layer in the helical structure.

Keywords:

• Cholesteric liquid crystal
• distributed feedback laser
• photon crystal
• defect mode