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Design of a laser diode pumped 100 mu J regenerative Cr:LiSGaF fs- amplifier

: Russbuldt, R.; Mans, T.; Hoffmann, D.; Poprawe, R.


IEEE Lasers and Electro-Optics Society; Optical Society of America -OSA-, Washington/D.C.:
Conference on Lasers and Electro-Optics (CLEO) 2002. Postconference digest : Summaries of papers presented at the Conference on Lasers and Electro-Optics, Long Beach Convention Center, Long Beach, California, May 19 - 24, 2002. Technical digest and postdeadline papers
Washington, DC: OSA, 2002 (Trends in optics and photonics series 73)
ISBN: 1-55752-705-9
ISBN: 1-557-52706-7
Conference on Lasers and Electro-Optics (CLEO) <23, 2002, Long Beach/Calif.>
Conference Paper
Fraunhofer ILT ()
laser diode pumped regenerative Cr:LiSGaF fs-amplifier; design; brewster cut Cr:LiSGaF crystal; double-sided pumping; collimation; microstep mirrors; polarization coupling; telecentric cylindrical telescope; caustic formation; relay optics; working distance; laser crystal; QCW operation; output coupling; slope efficiency; nominal current; second pump module; compression; 100 muJ; 12 mm; 25 W; 685 nm; 180 micron; 6.3 W; 63 ps; 10 W; 12 W; 200 pJ; LiSrGaF/sub 6/:Cr

Summary form only given. In the realized setup a 12 mm long brewster cut Cr:LiSGaF crystal is pumped double-sided with 2 x 25 W diode bars at 685 nm. After collimation, microstep mirrors, polarization coupling, telecentric cylindrical telescope, caustic formation and relay optics for increased working distance a square 180 mu m/sup 2/ spot, M/sup 2/ = 40 in both axes and 6.3 W at the laser crystal is achieved. In QCW operation (63 ps pulsewith, 2-6 kHz) with 2% output coupling >51% slope efficiency are attained. Recalculated optics will avoid clipping, so 10 W at nominal current and 12 W QCW appear attainable. Currently a second pump module is incorporated, so 200 pJ before compression seems feasible.