Photonic crystal miniature laser device resonant cavity based on Brewster angle

The invention relates to a laser resonant cavity, discloses a photonic crystal miniature laser device resonant cavity based on a Brewster angle, and aims to realize selective laser wavelength output.According to the main scheme, the laser resonant cavity, discloses a photonic crystal miniature laser device resonant cavity comprises two total reflection mirrors, wherein a certain included angle isformed between the two total reflection mirrors, the two total reflection mirrors are combined with a defect-shaped photonic crystal to form a triangular prism, the defect-shaped photonic crystal isa one-dimensional photonic crystal with defects and can be represented by (AB)4C(AB)4, the middle layer C is nematic liquid crystal and is a defect layer, the AB periods of the dielectric layers on the two sides are 4, compatible electrodes connected with an adjustable voltage source are arranged on the upper surface and the lower surface of a photonic crystal defect layer, when an external electric field exceeds a threshol