Lowering the lasing threshold by introducing cholesteric liquid crystal films to dye-doped cholesteric liquid crystal cell surfaces
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- Lowering the lasing threshold by introducing cholesteric liquid crystal films to dye-doped cholesteric liquid crystal cell surfaces
- Amemiya, K; Song, Myoung Hoon; Takanishi, Y; Ishikawa, K; Nishimura, S; Toyooka, T; Takezoe, H
- Cholesteric liquid crystal; DFB cavity; Lasing; Polymer; Threshold
- Issue Date
- JAPAN SOC APPLIED PHYSICS
- JAPANESE JOURNAL OF APPLIED PHYSICS, v.44, no.11, pp.7966 - 7971
- The effect of the introduction of polymer cholesteric liquid crystal (PCLC) films on the threshold of dye-doped cholesteric liquid crystal (CLC) distributed feedback (DFB) cavity lasing has been investigated. A PCLC film used to reflect a pump beam brings about the efficient use of incident energy, whereas a PCLC film used to reflect the emission contributes to amplifying the stimulated emission. As a result, the cell, in which both PCLC films are introduced, gains about a 60% reduction in the lasing threshold. It is also found that a lasing threshold exists not only for the excitation energy but also for the emission intensity. Namely, the lasing starts to occur at a certain emission level irrespective of the cell structures.
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