12 May 2015 Large aperture adaptive optics for intense lasers
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ISP SYSTEM has developed a range of large aperture electro-mechanical deformable mirrors (DM) suitable for ultra short pulsed intense lasers. The design of the MD-AME deformable mirror is based on force application on numerous locations thanks to electromechanical actuators driven by stepper motors. DM design and assembly method have been adapted to large aperture beams and the performances were evaluated on a first application for a beam with a diameter of 250mm at 45° angle of incidence. A Strehl ratio above 0.9 was reached for this application. Simulations were correlated with measurements on optical bench and the design has been validated by calculation for very large aperture (up to Ø550mm). Optical aberrations up to Zernike order 5 can be corrected with a very low residual error as for actual MD-AME mirror. Amplitude can reach up to several hundreds of μm for low order corrections. Hysteresis is lower than 0.1% and linearity better than 99%. Contrary to piezo-electric actuators, the μ-AME actuators avoid print-through effects and they permit to keep the mirror shape stable even unpowered, providing a high resistance to electro-magnetic pulses. The MD-AME mirrors can be adapted to circular, square or elliptical beams and they are compatible with all dielectric or metallic coatings.
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François Deneuville, François Deneuville, Laurent Ropert, Laurent Ropert, Paul Sauvageot, Paul Sauvageot, Sébastien Theis, Sébastien Theis, "Large aperture adaptive optics for intense lasers", Proc. SPIE 9513, High-Power, High-Energy, and High-Intensity Laser Technology II, 95130I (12 May 2015); doi: 10.1117/12.2178848; https://doi.org/10.1117/12.2178848

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