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A simple scheme for the efficient frequency doubling of a Fabry–Perot diode laser in a bow tie ring cavity is described. By feeding back the ring cavity transmission into the laser after reflection off a grating, the diode laser operates in single mode and the frequency locks to the cavity resonance. Using a simple analytic form of the beam parameters for the ring cavity, the optimum cavity configuration is found for a high degree of mode matching between the diode output beam and the ring cavity.
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Sun et al. (2000) studied this question.
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