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Colquiriite fs-sources for commercial applications

: Mans, T.; Rußbüldt, P.; Kreutz, E.W.; Hoffmann, D.; Poprawe, R.


Neev, J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Commercial and biomedical applications od ultrafast lasers III : 28 - 30 January 2003, San Jose, California, USA
Bellingham, WA: SPIE, 2003 (Proceedings of SPIE 4978)
ISBN: 0-8194-4778-1
Conference "Commercial and Biomedical Applications of Ultrafast Lasers" <3, 2003, San Jose/Calif.>
Fraunhofer ILT ()

Future commercial applications of fs-lasers require compact, reliable beam sources with low effort of operating expense. We report for the first time to our knowledge on a real all solid state master oscillator power amplifier system delivering pulse energies in the range of regenerative Ti:sapphire amplifier systems (>100 J) with sub 100 fs pulselength. The use of colquiriite crystals requires a pump source of high luminosity in the red spectral range. We realized such a pump source with red diode laser bars. Direct diode pumping and actively controlled thermoelectric cooling of diode bars and laser crystals ensure stable operation of oscillator and regenerative amplifier. For simplicity of the system we investigate stretcher-free CPA exploiting intracavity dispersion of the amplifier resonator. Due to low amplification of colquiriite crystals many roundtrips are required resulting in a stretched seed pulse. For pulse-compression a 6-prism-compressor was designed minim izing third order dispersion. Remaining dispersion is pre-compensated with chirped resonator mirrors. The presented laser system has been used for ablation of ear bones.