Abstract
The deformable mirror with the size of $410~\text{mm}\times 468~\text{mm}$ 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 $0.033~{\rm\mu}\text{m}$ (RMS). The possibility of correction of the aberrations in high-power lasers was numerically demonstrated.
Highlights
IntroductionThe deformable mirror is the main element of any adaptive optical system. The parameters of the deformable mirror (size, precision of correction, resolution, laser induced damage threshold, etc.) are very important for the operation of the system
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
Study of the wide aperture deformable mirror In the previous chapter we described a squared 260 mm × 260 mm deformable mirror attached to its mounting
Summary
The deformable mirror is the main element of any adaptive optical system. The parameters of the deformable mirror (size, precision of correction, resolution, laser induced damage threshold, etc.) are very important for the operation of the system. A 220 mm × 220 mm deformable mirror with 61 piezoelectric stacks with the same design has been developed for the Russian laser complex ‘Lutch’[5] Such mirrors have shown a high efficiency in correcting the wavefront of high-power pulsed lasers. For the LMJ (in France), another type of wide aperture deformable mirror was developed[6] It had a similar design as the mirror presented[4], but precise positioning stepper motor actuators were used instead of piezoelectric stack actuators. Such mechanical deformable mirrors show a large amplitude of correction, a high linearity and a low hysteresis. The considerable time it takes them to switch on and to operate (typically ∼1 sec), their large volume and their weight are the key disadvantages of this technology
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