Abstract

We designed a single-pass quasi-phase-matched second-harmonic generation (SHG) device with a planar waveguide; the device comprised a Y-cut 5 mol% MgO-doped ${\hbox {LiNbO}}_{3}~({\hbox {MgO}}{:}{\hbox {LiNbO}}_{3})$ crystal core that was 3 $\mu{\hbox {m}}$ thick and ${\hbox {SiO}}_{2}$ cladding. The waveguide provided a high coupling efficiency of 95% between an incident Gaussian beam and the fundamental guided mode of a fundamental wave; it also provided high electric-field confinement in the case of both the fundamental and SHG waves in the core. Thus, a high overlap between nonlinear polarization and an SHG-guided mode was attained. The bonding of the device with the waveguide side positioned downward to a heat sink provided a large heat radiation area when pumping with a near-collimated Gaussian beam, which reduced the temperature rise and its gradient along the waveguide to minimize the phase mismatch. We demonstrated the green light generation of 1.6 W with 40% conversion efficiency using a 7-mm-long sample and 1.2-W SHG with 60% efficiency using an 18-mm-long sample.

© 2009 IEEE

Planar-waveguide quasi-phase-matched second-harmonic-generation device inY-cut MgO-doped LiNbO3

Kiyohide Sakai, Yasuharu Koyata, and Yoshihito Hirano
Opt. Lett. 31(21) 3134-3136 (2006)

Highly efficient single-pass second harmonic generation in a periodically poled MgO:LiNbO₃ waveguide pumped by a fiber laser at 1111.6 nm

Hailing Jiang, Guohui Li, and Xinye Xu
Opt. Express 17(18) 16073-16080 (2009)

31%-efficient blue second-harmonic generation in a periodically poled MgO:LiNbO₃ waveguide by frequency doubling of an AlGaAs laser diode

Tomoya Sugita, Kiminori Mizuuchi, Yasuo Kitaoka, and Kazuhisa Yamamoto
Opt. Lett. 24(22) 1590-1592 (1999)

Efficient 340-nm light generation by a ridge-type waveguide in a first-order periodically poled MgO:LiNbO₃

Kiminori Mizuuchi, Tomoya Sugita, Kazuhisa Yamamoto, Tatsuo Kawaguchi, Takeshi Yoshino, and Minoru Imaeda
Opt. Lett. 28(15) 1344-1346 (2003)

Photorefractive inhibition of second harmonic generation in periodically poled MgO doped LiNbO₃ waveguide

Guohui Li, Yanxia Cui, and Jing Wang
Opt. Express 21(19) 21790-21799 (2013)