Gd<sub>x</sub>Y<sub>1-x</sub>Ca<sub>4</sub>O(BO<sub>3</sub>)<sub>3</sub> (GdYCOB) is a promising nonlinear optical crystal that shows high effective nonlinearity deff, noncritical phase matching, and high chemical stability. We report on the fabrication and characteristics of a monolithic wavelength converter, which generates ultraviolet light by the incidence of a 1.064 µm near-infrared laser. The converter consists of GdYCOB for third-harmonic generation, KTiOPO4 (KTP) for second-harmonic generation, and a wave plate. GdYCOB has the advantage of an extremely wide angular acceptance bandwidth, whereas KTP exhibits a high effective nonlinear coefficient and a broad temperature bandwidth. Consequently the combination of these crystals results in highly efficient and stable ultraviolet conversion for constructing a compact and robust ultraviolet laser.
© 2005 Optical Society of America
(130.3120) Integrated optics : Integrated optics devices
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4160) Nonlinear optics : Multiharmonic generation
Satoshi Hatano, Masashi Yoshimura, Yusuke Mori, Takatomo Sasaki, and Satoshi Ito, "Monolithic wavelength converter for ultraviolet light by use of a GdxY1-xCa4O(BO3)3 crystal," Appl. Opt. 44, 7651-7658 (2005)