Water-cooled deformable mirrors for high power beam correction

Vadim Samarkin; Alexander Alexandrov; Vladimir Toporovsky; Aleksei Rukosuev; Alexis Kudryashov

doi:10.1117/12.2599116

6 June 2021 Water-cooled deformable mirrors for high power beam correction

Vadim Samarkin, Alexander Alexandrov, Vladimir Toporovsky, Aleksei Rukosuev, Alexis Kudryashov

Proceedings Volume 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021); 1184917 (2021) https://doi.org/10.1117/12.2599116
Event: Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 2021, Suzhou, China

Abstract

Deformable mirrors in adaptive system for high power lasers should have high damage threshold and thermally stabilized surface. The cooling is required for average beam power above 100W. In this paper, the problem of the thermo-stabilizing of the deformable mirrors is studied. Bimorph deformable mirrors (BDM) and stack actuator deformable mirrors (SADM) are considered. For BDMs the active and passive cooling designs have been implemented. In active design, the waffletype cooling system for circulation of the cooling liquid was made inside of the thin substrate. In passive design, the periphery surface is thermally contacted with the condenser which temperature is constant. Such BDMs not damaged at CW power density 20kW/cm² when the beam fills full surface of the mirror and can be used in powerful solid state ceramic YAG lasers. SADM is most suitable to correct for small-scale and high-speed aberrations. We developed SADM where reflecting substrate is cooled through the actuator bodies. Individual actuators are housed in metal holders and can be replaced if they fail due to electrical breakdown. SADM has the diameter 120 mm and included 121 actuators. The deformation stroke of the actuator was 7μ. The first resonant frequency was 18.5 kHz, which allowed operating in adaptive system in kHz range.

Citation Download Citation

Vadim Samarkin, Alexander Alexandrov, Vladimir Toporovsky, Aleksei Rukosuev, and Alexis Kudryashov "Water-cooled deformable mirrors for high power beam correction", Proc. SPIE 11849, Fourth International Symposium on High Power Laser Science and Engineering (HPLSE 2021), 1184917 (6 June 2021); https://doi.org/10.1117/12.2599116

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