Photonic crystal surface-emitting laser and optical system

An optical system, comprising:

• a photonic crystal surface-emitting laser, comprising:
• a light emitting module, comprising:
• a photonic crystal layer,
• an active light emitting layer on a side of the photonic crystal layer,
• a first electrode on a side of the active light emitting layer facing away from the photonic crystal layer, and
• a second electrode at least partially on the side of the active light emitting layer facing away from the photonic crystal layer, and
• a driving module in electrical contact with surfaces of the first electrode and the second electrode facing away from the photonic crystal layer;
• and
• a control device electrically connected with the photonic crystal surface-emitting laser and configured to output the driving signals to the photonic crystal surface-emitting laser to drive the photonic crystal surface-emitting laser to generate a laser light;
• wherein the driving module is configured to output driving signals to the first electrode and the second electrode to drive the active light emitting layer to generate photons, the photons are incident into the photonic crystal layer to generate a laser light through oscillation on Bragg diffraction.