| abstract |
A laser oscillation element capable of sufficiently preventing fluctuations in the laser oscillation wavelength is provided. Laser oscillation element 1 of The present invention includes a dye 3 and the liquid crystal emits fluorescence by photoexcitation, the liquid crystal comprises a high polymer cholesteric liquid crystal 4, of the liquid crystal major axis direction refractive index n e and the minor axis direction of the the difference Δn between the refractive index n o is provided with a high polymer cholesteric liquid crystal film 2 is 0.15 to 0.45, the emission band and high polymer cholesteric liquid crystal film 2 of the selective reflection wavelength band of the fluorescence emitted from the dye 3 Are overlapped at least partially, and the helical axis of the liquid crystal in the polymer cholesteric liquid crystal film 2 is parallel to the thickness direction of the polymer cholesteric liquid crystal film 2, so that the spiral of the liquid crystal in the polymer cholesteric liquid crystal film 2 is The orientation is fixed. [Selection] Figure 1 |