Optics Letters · 2005 · 20 citations · 12 references
Natural SciencesElectrical EngineeringOpticsOptoelectronicsPhotonicsLaser OpticsLaser PhysicsNonlinear Optical MaterialsNonlinear OpticsOptical SourcesUltrafast OpticsFemtosecond Laser PulsesFemtosecond Laser SourcesHigh-harmonic GenerationInternal Conversion CoefficientsSecond-harmonic GenerationUltra-short Pulse GenerationUltrafast Pulse GenerationUltrashort Pulse Generation
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.
12