Cryogenic cooling for high power laser amplifiers
1 CEA/INAC/SBT, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France
2 Institute of Physics of the ASCR, v.v.i. 18221 Prague 8, Czech Republic
Published online: 15 November 2013
Using DPSSL (Diode Pumped Solid State Lasers) as pumping technology, PW-class lasers with enhanced repetition rates are developed. Each of the Yb YAG amplifiers will be diode-pumped at a wavelength of 940 nm. This is a prerequisite for achieving high repetition rates (light amplification duration 1 millisecond and repetition rate 10 Hz). The efficiency of DPSSL is inversely proportional to the temperature, for this reason the slab amplifier have to be cooled at a temperature in the range of 100 K–170 K with a heat flux of 1 MW*m−2. This paper describes the thermo-mechanical analysis for the design of the amplification laser head, presents a preliminary proposal for the required cryogenic cooling system and finally outlines the gain of cryogenic operation for the efficiency of high pulsed laser.
© Owned by the authors, published by EDP Sciences, 2013
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