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New concepts for compact diode-pumped fs-lasers


Beckmann, L.H.J.F. ; European Optical Society -EOS-:
Lasers in material processing
Bellingham, Wash.: SPIE, 1997 (Europto series)
ISBN: 0-8194-2517-6
S.705-711 : Ill., Lit.
Conference on Lasers in Material Processing <1997, München>
Fraunhofer ILT ()
chirped mirror; Cr:LiSGaF; diode pumping; fs-Laser; GTI-mirror; Kerr lens modelocking

We report the successful implementation of Gires-Tournois(GTI) and chirped mirrors in a diode-pumped, Kerr-lens modelocked (KLM) Cr:LiSGaF laser. The laser delivered 30mW of 79fs nearly transform limited pulses at 855mn and 90MHz repetition rate. The mirror-dispersion controlled cavity is compared to our prism setup and Pulse width limitations in diode pumped Cr:LiSGaF / Cr:LiSAF lasers are identified. Mode matching calculations, of pump beam and cavity mode are presented to optimise low threshold, highly efficient fs-operation. Following this analysis a compact prismless design of roughly shoe box size is suggested, which incorporates an additional high n2 element to enhance stability.