Adaptive optics engineering handbook by Robert Tyson

By Robert Tyson

This instruction manual provides analytical instruments for the layout and improvement of adaptive optics structures to augment their skill to regulate for atmospheric turbulence, optical fabrication error, thermally prompted distortions, and laser machine aberrations. It presents techniques for choosing, trying out and fitting a wavefront reimbursement system.

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Now, nematic liquid crystals with up to 10 waves of throw with analog (continuous) control are possible. , 25 Hz), they are polarization independent and show high optical quality (A/15). Devices up to 127 pixels have been reported (1 6). Technology improvement is expected by changing the viscosity of the crystal, varying its operational thickness, and optimizing the control voltage. See Chapter 7 for the details on recent liquid crystal adaptive optics development and construction. In addition to devices used for wavefront correction, new advances in optics, primarily binary optics and diffractive optics, have application directly in wavefront sensors and beam shaping applications.

S. Acton, P. L. Wizinowich, P. J. Stomski, J. C. Shelton, 0. Lai, J . M. Brase, Proc. SPlE 3353, 125 (1998). E. J. Kibblewhite, M. R. Chun, J. E. Larkin, V. Scor, F. Shi, M. F. Smutko, W. J. Wild, Proc. SPIE 3353, 60 (1998). L. K. Saddlemyer, G. -P. Veran, J. M. Fletcher. Proc. SPIE 3353, 150 ( 1998). G. Herriot, S. Morris, S. Roberts, J. M. Fletcher, L. K. Saddlemyer, G. P. Veran, E. H. Richardson, Proc. SPIE 3353,488 (1998). H. Takami, N. Takato, M. Otsubo, T. Kanzawa, Y. Kamata, K. Nakashima, M.

The low-frequency behavior of the turbulence transfer function approximates that of a two-pole high-pass filter of bandwidth 1/(2nz,), whereas the noise transfer function is equivalent to a fourpole low-pass filter of bandwidth 5/(6nz,). When the integrals of Eqs. (29) and (30) are compared to those for ideal binary filter functions, the following approximate relationships are obtained: B, =r 1 - 10 z, (31) and It is perhaps surprising that the noise bandwidth is a factor of 3 larger than the turbulence-correction bandwidth; however, both of these expressions are in good agreement with the usual design guidelines for a discrete servo system operating at a sample rate of l h , .

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