We report continuous-wave single-pass second-harmonic generation (SHG) in 4-μm -period 0.5-mm-thick backswitch-poled lithium niobate. Pump sources at 920–930 nm include both Ti:sapphire and diode-oscillator–amplifier lasers. SHG of a Ti:sapphire laser at 6.1%/W efficiency, producing 61 mW of power at 460 nm, is demonstrated in 50-mm-long periodically poled lithium niobate samples with a nonlinear coefficient d<sub>eff</sub>≈9pm/V, and 60 mW at 465 nm and 2.8%/W efficiency is obtained by SHG of a laser-diode source.
© 1999 Optical Society of America
(140.2020) Lasers and laser optics : Diode lasers
(160.3730) Materials : Lithium niobate
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4360) Nonlinear optics : Nonlinear optics, devices
Robert G. Batchko, Martin M. Fejer, Robert L. Byer, Dirk Woll, Richard Wallenstein, Vladimir Y. Shur, and Levent Erman, "Continuous-wave quasi-phase-matched generation of 60 mW at 465 nm by single-pass frequency doubling of a laser diode in backswitch-poled lithium niobate," Opt. Lett. 24, 1293-1295 (1999)