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

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...

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Bibliographic Details
Published in:Optics express 2011-06, Vol.19 (13), p.12766-12780
Main Authors: Lucianetti, Antonio, Albach, Daniel, Chanteloup, Jean-Christophe
Format: Article
Language:English
Subjects:
Amplifiers, Electronic
Atmospheric Pressure
Chromium - chemistry
Cold Temperature
Helium - chemistry
Lasers, Solid-State
Models, Theoretical
Thermodynamics
Ytterbium - chemistry
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.19.012766