In this paper we consider two approaches widely used in testing of spherical optical surfaces: Fizeau interferometer and Shack-Hartmann wavefront sensor. Fizeau interferometer that is widely used in optical testing can be transformed to a device using Shack-Hartmann wavefront sensor, the alternative technique to check spherical optical components. We call this device Hartmannometer, and compare its features to those of Fizeau interferometer.
Two types of the large bimorph deformable mirrors with the size of 410x468 mm and 320 mm were developed and tested. 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 μm (RMS). The possibility of correction of the aberrations in high power lasers was numerically demonstrated.
The deformable mirror with the size of 410x468 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 μm (RMS). The possibility of correction of the aberrations in high power lasers was numerically demonstrated.
Wide aperture bimorph mirrors for laser beam correction and formation were developed and investigated. Different types of substrates and active piezoceramics materials were considered to fabricate temperature independent shape of the mirror surface and to maximize the sensitivity of the mirror. High reflectivity coatings for different wavelengths were studied.
Here we investigate closed-loop adaptive optical system to compensate for laser beam aberrations. A bimorph mirror is
used as a wavefront corrector and Shack-Hartmann wavefront sensor is an element for feedback control. Comparison of
phase conjugation and multi-dither technique is shown.
The problem of wavefront measurements is one of the most important tasks in the modern optics and laser physics. There
are lots of different tools for wavefront measurement. And the user might choose any type of instrument which could
solve certain task. The devices for wavefront analysis differ from each other not only by setup and by processing
algorithms but also dynamic range and accuracy should be taken into account. The most popular devices are Shack-
Hartmann wavefront sensor and various types of interferometers.
In this paper we compare Shack-Hartmann wavefront sensor with Fizeau interferometer; classical analysis of
interferograms (based on measurement of the fringe centers position) and phase-shifting methods are also compared.
Advantages and disadvantages of three methods are discussed.
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