The Innoslab design, already established for neodymium doped laser crystals, was applied to ytterbium doped laser materials. Recent progresses in brightness of high power diode lasers facilitate efficient pumping of quasi-three-level laser materials. Innoslab amplifiers are compared to competing thin-disk and fiber fs-amplifiers. A compact diode-pumped Yb:YAG Innoslab fs-oscillator-amplifier system, scalable to the kilowatt range, was realized. Numerical simulations result in conditions for high efficiency and beam quality. Nearly transform and diffraction limited 680 fs pulses at 400 W average output power and 76 MHz repetition rate without using CPA technology have been achieved at room temperature so far.
We report the successful implementation of Gires-Toumois (GTI) and chirped mirrors in a diode-pumped, Kerr-lens modelocked (KLM) Cr:LiSGaF laser.The laser delivered 30mW of79fs, nearly transform limited pulses at 855nmand 90MHz repetition rate.The mirror-dispersion controlled cavity is compared to our prism setup and pulse width limitations in diode pumped Cr:LiSGaF I Cr:LiSAF lasers are identified.Mode matching calculations 'of pump beam and cavity mode are presented to optimise low threshold, highly efficient fsoperation.Following this analysis a compact prismiess design of roughly shoe box size is suggested, which incorporates an additional high n2 element to enhance stability.
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