3results about How to "High beam quality" patented technology

The application discloses a kind of parallel coupling self-imaging external cavity coherent array semiconductor laser, comprising: semiconductor laser chip array, light transmission dielectric layer and external cavity reflection layer;Semiconductor laser chip array includes multiple light emitting units, light transmission dielectric layer and external cavity reflection layer form laser self-imaging external cavity;The non-light emitting area of semiconductor laser chip array light emitting surface is coated with high reflection film, and the feedback light that cannot be injected into the light emitting unit due to incomplete self-imaging at the edge of semiconductor laser chip array can oscillate in self-imaging external cavity multiple times to reform the self-imaging that can be completely injected into the light emitting unit.The application improves the injection of laser outside the light emitting area, can efficiently parallel coupling all light emitting units including edge in chip array, eliminate the edge effect of chip array generated by self-imaging external cavity feedback, enhance the feedback efficiency of self-imaging external cavity, obtain the coherent array laser output of high parallel coupling efficiency, high efficiency optical mutual injection.

The application discloses a low-repetition-frequency optical fiber laser amplifier pump light time-sharing and light-splitting device. The device comprises a pump source, a fiber acousto-optic modulator, a plurality of laser systems and a control unit. The pump source is used for generating pump light; the fiber acousto-optic modulator is connected with the output end of the pump source and is used for receiving the pump light and realizing time-sharing and light-splitting; the plurality of laser systems are respectively connected with the light-splitting output ends of the fiber acousto-optic modulator to form respective light-splitting branches and are used for receiving time-sharing pump light and performing laser amplification; and the control unit is connected with the fiber acousto-optic modulator and is used for controlling the time-sharing and light-splitting operation of the fiber acousto-optic modulator according to a preset time sequence. The device structure in the technical scheme of the application is relatively simple, easy to realize and integrate, the pump light is time-shared and light-split by the acousto-optic modulator, the ASE during the fiber laser amplification can be obviously inhibited, the beam quality and power stability of the laser output are improved, and the reasonable distribution and efficient utilization of the pump light in the plurality of laser systems can be realized.

The utility model discloses a critical space laser ranging device, including laser emission module and receiving module, laser emission module includes laser, emission lens barrel and emission collimating optical system, and the laser is fixed at the back end of emission lens barrel, and emission collimating optical system is located in emission lens barrel, and emission collimating optical system includes first double concave lens, first double convex lens, second double concave lens and second double convex lens, receiving module includes receiving lens barrel, focusing system and detector, and focusing system is located in receiving lens barrel, and focusing system includes third double convex lens, first meniscus and second meniscus, and the detector is fixed at the back end of receiving lens barrel. The utility model improves laser emitter's output power density and beam quality, realizes the spatial concentrated distribution of energy through the divergence angle of emission beam is suppressed, and the focusing characteristic of echo beam is optimized simultaneously, improves the optical coupling efficiency, thereby enhances the signal to noise ratio of detector receiving signal.