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Opt Express. 2011 Jun 20;19(13):12766-80. doi: 10.1364/OE.19.012766.

Active-mirror-laser-amplifier thermal management with tunable helium pressure at cryogenic temperatures.

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  • 1LULI, Ecole Polytechnique, CNRS, CEA, UPMC; Route de Saclay, 91128 Palaiseau, France. antonio.lucianetti@polytechnique.edu


We illustrate the benefits of a thin, low pressure helium cell for efficient and safe heat removal in cryogenically-cooled active mirror laser amplifiers operating in the [100 J-1 kJ]/[1-10 Hz] range. A homogeneous gain medium temperature distribution averaging 160 K is obtained with a sub-mm helium-filled gap between the gain medium and a copper plate at 77 K. A significant degree of flexibility for tuning the temperature in the amplifier can be achieved by varying the pressure of the helium gas in the 10(2) to 10(5) Pa range.

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