We report 32% efficient frequency doubling of single-frequency $1029\mathrm{nm}$ light to green light at $514.5\mathrm{nm}$ using a single-pass configuration. A congruent composition, periodically poled magnesium-doped lithium niobate (PPMgLN) crystal of $50\mathrm{mm}$ length was used to generate a second-harmonic power of $2.3\mathrm{W}$ . 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.

© 2008 Optical Society of America

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