LASER OSCILLATION ELEMENT

PROBLEM TO BE SOLVED: To provide a laser oscillation element that can sufficiently reduce amount of excited energy required for laser oscillation. SOLUTION: The laser oscillation element 100 includes cholesteric liquid crystal and is provided with cholesteric liquid crystal layers 1 to 5 laminated in the constant direction. The cholesteric liquid crystal layer 1 of the cholesteric liquid crystal layers 1 to 5 is a pigment containing layer including pigment for emitting light when it is externally excited and the remaining four cholesteric liquid crystal layers 2 to 5 are non-pigment layers not including pigment. Each side of the pigment containing cholesteric liquid crystal layer 1, is provided with two of the cholesteric layers 2 to 5 of the non-pigment layers are respectively provided and each of the cholesteric liquid crystal layers 2 to 5 has the identical spiral pitch. At least a part of the light-emitting band of the light emitted from the pigment is overlapped with a part of the selected reflection wavelength band of the cholesteric liquid crystal in the cholesteric liquid crystal layers 2 to 5. COPYRIGHT: (C)2009,JPO&INPIT