26 July 1993 Control and formation of the output radiation of the technological lasers by methods of adaptive optics
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Proceedings Volume 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology; 19830G (1993) https://doi.org/10.1117/12.2308435
Event: 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 1993, Budapest, Hungary
Abstract
The results of the use of adaptive bimorph mirror for control of CO2, YAG, excimer and copper-vapor lasers beam parameters are presented in this work. The possibility to reduce divergence and form various combinations of mode structures of laser beam are shown. The development of methods and elements of adaptive optics permits to use industrial lasers in different new spheres of technology and to improve laser beam parameters. Main tasks that should be solved by laser adaptive system are the following: 1. Stabilization and optimization of different radiation parameters; 2. Formation of given intensity distribution of laser beam. Different methods are used to get the desired result. Firest of all complex optical systems with rather expensive optical elements. Another way is to use kinoform flat optics. The new method of laser beam formation and stabilization is application of adaptive optical systems both extracavity and intracavity. Parameters of laser beam depend on different intracavity distortions. In the most cases these distortions act as a pure phase one: Fluctuations of refractive index of active medium, thermal mirror deformations etc. This may distore spatial distribution of the radiation intensity and increase the beam divergence. The use of intracavity adaptive optical elements can reduce such undesirable effects, influence on geometry of the generated modes and suppress the output power fluctuations. Every adaptive system consists of three main elements: corrector of the wave front (deformable mirror) , sensor and electronic control system. In our expriments a circular semipassive flexible bimorph mirror with 17 control electrodes was used as a corrector. It was made of round copper plate (40 mm diameter, 2 mm of thickness) and piezoelectric ceramic disk (0.3 mm of thickness) glued to copper plate. A number of channels were made in copper plate in order to cool the mirror by water. The reflective dielectric covering was layed on external surface of the plate. The mirror was fixed in a holder by rubber rings. Under applied voltage of +300 V to every electrode the corrector surface becames of a spherical shape (radius of curvature 7000 mm) . The maximum displacement in the centre of mirror was 6 micrones.
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Alexis Kudryashov, Alexis Kudryashov, } "Control and formation of the output radiation of the technological lasers by methods of adaptive optics", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 19830G (26 July 1993); doi: 10.1117/12.2308435; https://doi.org/10.1117/12.2308435
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