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
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