Laser oscillation elements

Details Laser oscillation elements Laser oscillation elements

2004-10-08

2010-11-02

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular active media

Liquid

C372S053000

Reexamination Certificate

active

07826510

ABSTRACT:
A laser oscillation element1according to the invention comprises a cholesteric liquid crystal layer2containing cholesteric liquid crystals, a cholesteric liquid crystal layer3containing cholesteric liquid crystals facing the cholesteric liquid crystal layer2, and a defect layer4containing a dye5which emits fluorescence upon optical excitation disposed between the cholesteric liquid crystal layers2, 3. A selective reflection wavelength band in the cholesteric liquid crystals overlaps with the emission band of the fluorescence emitted by the dye5, the helical winding directions of the cholesteric liquid crystals contained in the cholesteric liquid crystal layers2, 3are identical, and the transition moments of the dye5are aligned parallel to the surfaces of the cholesteric liquid crystal layers2, 3. According to the laser oscillation element1, a laser oscillation can be generated with high efficiency. Moreover, continuous wave lasing can be generated.

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