8 May 1996 Second, third, and fourth harmonic generation of amplified femtosecond Ti:sapphire laser pulses
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Abstract
We studied both experimentally and theoretically, the conversion efficiency of 150-fs-duration Ti:sapphire laser pulses to the second, third and fourth harmonic. The laser pulses at the wavelength of 780 nm have a spectral width of 10 nm and were amplified to 0.8 mJ energy in a regenerative amplifier. With a repetition rate of 1 kHz intensity of up to 150 GW/cm2 could be reached by focusing the beam with a lens. KDP, BBO and LilO3 crystals of different length were used for the conversion process. The experimentally observed conversion efficiency to the second, third and fourth harmonic does not exceed 50%, 15% and 8%, correspondingly. It is shown theoretically that one possible process limiting the conversion efficiency of the femtosecond pulses at low as well as high intensity is the modulation of the phase of the fundamental wave.
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Vitaly N. Krylov, Alexander G. Kalintsev, Aleksander Rebane, Daniel Erni, Urs Paul Wild, "Second, third, and fourth harmonic generation of amplified femtosecond Ti:sapphire laser pulses", Proc. SPIE 2701, Generation, Amplification, and Measurement of Ultrashort Laser Pulses III, (8 May 1996); doi: 10.1117/12.239716; https://doi.org/10.1117/12.239716
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KEYWORDS
Crystals

Phase matching

Second-harmonic generation

Harmonic generation

Nonlinear crystals

Femtosecond phenomena

Sapphire lasers

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