By Robert Tyson
This guide provides analytical instruments for the layout and improvement of adaptive optics structures to reinforce their skill to regulate for atmospheric turbulence, optical fabrication mistakes, thermally triggered distortions, and laser machine aberrations. It offers thoughts for choosing, checking out and fitting a wavefront reimbursement system.
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8a, the incoming radiation is sampled by a pair of wavefront sensors that separately measure one-dimensional x and y gradients. The sampling regions of the two sensors are displaced such that each measurement is centered at the midpoint of a horizontal or vertical line drawn between two adjacent phase points. The Fried geometry ( 1 l ) , illustrated in Fig. 8b, can be realized by a single camera that System Design and Optimization 39 Figure 8 Separate one-dimensional x and y gradient measurements may be made between two adjacent phase points, as specified by the Hudgin sampling geometry (a), or two-dimensional gradient samples can be obtained within a region centered at the midpoint of four phase points according to the Fried geometry (b).
G. Allen, G. A. Ameer, J. M. Brown 11, J. C. Christou, T. S. Duncan, R. J. Eager, M. A. Ealey, B. L. Ellerbroek, R. Q. Fugate, G. W. Jones, R. M. Kuhns, D. J. Lee, W. H. Lowrey, M. D. Oliker, R. E. Ruane, D. W. Swindle, J. K. Voas, W. J. Wild, K. B. Wilson, J. L. Wynia, Proc. SPIE 3353, 22 ( 1998). R. Arsenault, D. Salmon, F. Roddier, G. Monnet, J. Ken-, J. Sovka, “The CanadaFrance-Hawaii Telescope Adaptive Optics Instrument Adaptor,” Proc. SPIE 1920, 364 (1993); J. E. Graves, M. J. Northcott, F.
The overall performance of the phase-conjugation system can be characterized by its ability to simultaneously suppress turbulence-induced phase distortions and wavefront sensor noise. The properties of individual components of the system are most conveniently described by a frequency-domain transfer function, which is applied to the power spectrum of the input disturbance; these transfer functions are described in Fig. 10. The net transfer function of the loop also depends on the point at which the disturbance is applied ( 1 8).
Adaptive optics engineering handbook by Robert Tyson