Download e-book for kindle: Adaptive optics engineering handbook by Robert Tyson
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 error, thermally prompted distortions, and laser machine aberrations. It offers options for choosing, checking out and fitting a wavefront repayment system.
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The image intensifier for the WFS is a Hamamatsu C2166-1. , Canada) CCD CA-0128A. The wavefront processor uses 12 Texas Instruments TMS320CS0 DSP chips. The closed-loop bandwidth is SO Hz (47). 2-pm stroke and 3% hysteresis. The Rayleigh laser guide star is still under development. The laser will be a frequency doubled Nd:YAG, lOO-mJ/pulse, device operating at 838 Hz to match the WFS. 2 m telescope. The 21-actuator system operated for stellar imaging in visible wavelengths. This system had a 300-Hz open-loop bandwidth, with 700-V DM and separate tilt mirror.
The transfer function with respect to an optical disturbance inserted at the deformable mirror is whereas the transfer function for noise generated by the wavefront sensor has the form The functions Ha,,H,, and H, represent the averager, accumulator, and mirror component transfer functions, respectively. The power spectrum of the residual error is the sum of the turbulence and noise outputs: where Ffi,corresponds to the function defined by Eq. (7). This analysis can also be applied to the tilt correction system by replacing the turbulence power spectrum with Flllland applying the appropriate dwell-time and mirror-response parameters in the component transfer functions.
USSR) 3,401 (1957); English translation in F. , Active and Adaptive Optics, European Southern Observatory Conf. and Proc. 48, European Southern Observatory, Garching bei Munchen, Germany ( 1994), p. 535. J. W. Hardy, Sci. , June (1994), p. 60 D. L. Fried, J. Opt. Soc. Am. 56, 1380 (1966). D. P. Greenwood, J. Opt. Soc. Am. 67, 390 (1977). G. A. Tyler, J. Opt. Soc. Am. A, 1, 251 (1984). V. P. Lukin, Atmospheric Adaptive Optics, SPIE Opt. Engr. Press, Bellingham, WA, 1995. R. Foy, A. Labeyrie, Astron.
Adaptive optics engineering handbook by Robert Tyson