Efficient femtosecond green generation in a periodically poled LiTaO_(3) crystal using a diode-pumped Yb:KYW laser

摘要

Efficient generation of femtosecond pulses at 525nm has been demonstrated by the extracavity frequency doubling of the output of a diode-pumped femtosecond Yb:KYW laser using a periodically-poled LiTaO_(3) crystal. An average second harmonic power of 150mW was produced at nonlinear conversion efficiency of 43percent. The temporal characteristics of the frequency-doubled pulses as a function of focusing conditions in a "thick" nonlinear crystal have been investigated experimentally and pulses as short as 225fs have been generated at a pulse repetition frequency of 86MHz.