Photonic crystal surface emitting laser device and optical system

The invention provides a photonic crystal surface emitting type laser device. The photonic crystal surface emitting type laser device comprises a substrate; the light-emitting layer is positioned on one surface of the substrate and is used for generating photons under the driving of a driving signal; the photonic crystal layer is located on the side, away from the substrate, of the light-emitting layer, and Bragg diffraction oscillation is generated in the photonic crystal layer when photons are incident to the photonic crystal layer so that laser can be generated; the metasurface is located on the side, away from the photonic crystal layer, of the substrate, the metasurface comprises a base and a plurality of cylinders formed on one surface of the base at intervals, at least two cylinders are different in shape or/and size, and the metasurface is used for receiving the laser, diffracting the laser and then emitting the laser. And the shapes and sizes of the plurality of cylinders are used for controlling the