We report 32% efficient frequency doubling of single-frequency light to green light at using a single-pass configuration. A congruent composition, periodically poled magnesium-doped lithium niobate (PPMgLN) crystal of length was used to generate a second-harmonic power of . To our knowledge, this is the highest reported power and efficiency achieved in the second-harmonic generation of single-frequency green light in a single-pass configuration.
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