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Performance of a thermal-piezoelectric deformable mirror under 6.2 kW continuous-wave operation

: Reinlein, Claudia; Appelfelder, Michael; Goy, Matthias; Ludewigt, Klaus; Tünnermann, Andreas


Applied optics 52 (2013), No.34, pp.8363-8368
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Journal Article
Fraunhofer IOF ()

The thermal-piezoelectric deformable mirror (TPDM) is a device employed to compensate for laser-induced mirror deformation and thermal lensing in high-power optical systems. The TPDM setup is a unimorph deformable mirror with thermal and piezoelectric actuation properties. Laser-induced thermal lensing is compensated for by heating of the TPDM. We show that this mirror can be applied to high-power laser systems of up to 6.2 kW laser power and high power densities of up to 2  kW/cm2. The piezoelectric stroke of the single actuators is between 1.5 and 4 μm and is not reduced by either the absorbed laser power or mirror heating.