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20 March 2003 Modal corrector integrated in silicon: possibilities for implementation
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Application of liquid crystal (LC) modulators as phase modulators for wavefront control is important for the development of inexpensive adaptive optics systems. Currently only piston-type LC correctors are available, however the implementation of a modal approach promises much higher optical performances. Besides, implementation of silicon technology allows integration of this device and part of its control electronics in a single chip. It was found that the optical performance of a modal LC corrector is comparable to that of existing deformable mirrors; besides, adjustment of frequency and phase of driving AC voltages can further improve it. We illustrate it by numerical simulation results obtained in the framework of the Kolmogorov statistical theory of atmosphere. Development of a compact integrated device imposes some additional requirements - using of low voltages (units of volts), small amount of energy consumed by LC and integrated circuitry, preferably digital design of electronics. We report the results of feedback loop operations obtained with the device manufactured using different technology. We also discuss the technology and present the design of a modal LC corrector with silicon backplane. Several control techniques are discussed in terms of optical performance, energy consumption, cost of manufacturing and possibility for integration.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mikhail Yu. Loktev, Gleb V. Vdovin, and Pasqualina M. Sarro "Modal corrector integrated in silicon: possibilities for implementation", Proc. SPIE 4884, Optics in Atmospheric Propagation and Adaptive Systems V, (20 March 2003);


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