• High Power Laser Science and Engineering
  • Vol. 4, Issue 1, 010000e4 (2016)
Vadim Samarkin1, Alexander Alexandrov1, Gilles Borsoni2, Takahisa Jitsuno3, Pavel Romanov1, Aleksei Rukosuev1, and Alexis Kudryashov1、2
Author Affiliations
  • 1Moscow State University of Mechanical Engineering (MAMI), B. Semenovskaya 38, Moscow 107023, Russia
  • 2AKA Optics SAS, 2 rue Marc Donadille, Marseille 13013, France
  • 3Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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    Abstract

    The deformable mirror with the size of 410 mm468 mm controlled by the bimorph piezoceramic plates and multilayer piezoceramic stacks was developed. The results of the measurements of the response functions of all the actuators and of the surface shape of the deformable mirror are presented in this paper. The study of the mirror with a Fizeau interferometer and a Shack–Hartmann wavefront sensor has shown that it was possible to improve the flatness of the surface down to a residual roughness of 0:033 mm (RMS). The possibility of correction of the aberrations in high-power lasers was numerically demonstrated.

    1 Introduction

    There are various solid-state pulse lasers based on Nd:glass with the output beam power of the PW level, such as the National Ignition Facility (NIF) in the United States, the MEGAJOULE (LMJ) in France, the SHENGUAN III in China, the LFEX in Japan, the Lutch in Russia, etc. The increasing of the laser pumping power leads to an increase of the inhomogeneities in the active media and the distortions of the reflective and refractive surfaces of the optical elements primarily due to heating. As a result, the wavefront of the output beam is distorted significantly. The spectrum of the distortions of the phase and of the amplitude in the high-power lasers has been observed for the wide range of the spatial frequencies $k\approx 1\times 10^{2}{-}2.5\times 10^{-3}~\text{mm}^{-1}$ and, correspondingly, spatial lengths ranging from 0.01 to 400 mm[1, 2]. The high-frequency components of the aberrations are usually removed with spatial filters in the optical amplifiers. The local tilts of the wavefront (wavefront aberrations), with spatial lengths ranging from 33 to 400 mm, determine the divergence and as a consequence, determine the possibility to obtain a diffraction limited focus spot. To obtain the beam intensities of ${\sim}10^{+22}~\text{W}/\text{cm}^{2}$ and more at the target–laser interaction spot, the large scale and the low-frequency wavefront aberrations have to be corrected. This is only possible with adaptive optical systems. Moreover, nowadays an adaptive optical system is mandatory in a high-power laser system.

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    Vadim Samarkin, Alexander Alexandrov, Gilles Borsoni, Takahisa Jitsuno, Pavel Romanov, Aleksei Rukosuev, Alexis Kudryashov. Wide aperture piezoceramic deformable mirrors for aberration correction in high-power lasers[J]. High Power Laser Science and Engineering, 2016, 4(1): 010000e4
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    Received: Dec. 1, 2015
    Accepted: Dec. 31, 2015
    Published Online: Oct. 25, 2016
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