Efficient generation of femtosecond pulses at 524 nm is demonstrated by the extracavity frequency doubling of the output of a diode-pumped femtosecond Yb3+:KY(WO4)2 laser using a periodically poled LiTaO3 crystal. An average second-harmonic power of 120 mW is produced at an internal conversion efficiency of 40%. The temporal characteristics of the frequency-doubled pulses as a function of focusing conditions in a thick nonlinear crystal are investigated experimentally, and pulses as short as 225 fs are generated at a pulse repetition frequency of 86 MHz.
© 2005 Optical Society of America
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.7090) Lasers and laser optics : Ultrafast lasers
(140.7300) Lasers and laser optics : Visible lasers
(190.4400) Nonlinear optics : Nonlinear optics, materials
A. A. Lagatsky, E. U. Rafailov, A. R. Sarmani, C. T. A. Brown, W. Sibbett, L. Ming, and P. G. R. Smith, "Efficient femtosecond green-light source with a diode-pumped mode-locked Yb3+:KY(WO4)2 laser," Opt. Lett. 30, 1144-1146 (2005)