[OPTICAL REVIEW Vol. 7, No. 1 (2000) 22-24]
Highly Efficient Frequency Doubling with a KNbO3 Semi-Monolithic Resonator
Optoelectronics Division, Electrotechnical Laboratory, 1-1-4, Umezono, Tsukuba, 305-8568 Japan
(Received August 20 1999; Accepted October 16, 1999)
A semi-monolithic standing-wave resonator has been constructed and employed for frequency doubling of a Ti:sapphire laser. The resonator consists of a 5 mm long KNbO3 crystal with dielectric coatings on both end faces and a spherical mirror with 20 mm radius of curvature. With 31.2 mW input power at 861.4 nm second harmonic power of 11.4 mW has been generated corresponding to the conversion efficiency of 36.5%.
Key words : frequency doubling, nonlinear optic crystal, KNbO3, Ti:sapphire laser, semi-monolithic resonator