Lagatsky, A.A., Rafailov, E.U., Sarmani, A.R., Brown, C.T.A., Sibbett, W., Ming, L. and Smith, P.G.R.
Efficient femtosecond green-light source with a diode-pumped mode-locked Yb3+:KY(WO4)2 laser
Optics Letters, 30, (10), . (doi:10.1364/OL.30.001144).
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Efficient generation of femtosecond pulses at 524 nm is demonstrated by the extracavity frequency doubling of the output of a diode-pumped femtosecond Yb 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.
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