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Traditional methods for generating orbital angular momentum (OAM) lightinclude holographic diffraction gratings, vortex phase plate and spatial lightmodulator. In this article, we report a new method for high efficient OAM lightgeneration. By pumping an external cavity contains a quasi phase matchingnonlinear crystal with a fundamental OAM carrying light and properly aligningthe cavity, mode matching between the pump light and the cavitys higher orderLaguerre-Gaussian (LG) mode is achieved, conversion efficiency up to 10.3percentage have been obtained. We have demonstrated that the cavity can stablyoperate at its higher order LG mode just as Gaussian mode for the first time.The SHG light possesses a doubled OAM value with respect to the pump light. Theparameters that affect the beam quality and conversion efficiency are discussedin detail. Our work opens a brand new field in laser optics, and makes thefirst step toward high efficiency OAM light processing.

High efficiency SHG of orbital angular momentum light in an external cavity