Wavelength dependence of adaptive optics compensation

Details Wavelength dependence of adaptive optics compensation Wavelength dependence of adaptive optics compensation

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983spie..410..161b&link_type=abstract

IN: Laser beam propagation in the atmosphere; Proceedings of the Meeting, Arlington, VA, April 5, 6, 1983 (A85-22628 09-36). Bel

Physics

Optics

Adaptive Optics, Instrument Compensation, Laser Outputs, Light Beams, Optical Correction Procedure, Telescopes, Atmospheric Effects, Irradiance, Modulation Transfer Function, Phase Error, Point Spread Functions, Wave Fronts, Wavelengths

Scientific paper

An adaptive optics system can allow simultaneous emission of a high energy laser (HEL) beam and return wavefront sensing for maximizing energy deposition at the target provided the return wavefront is a different phase than the emitted beam. A dichroic beamsplitter is placed in the aperture to monitor outgoing and incoming wavefronts. However, it is also necessary to aim the HEL beam at a point on the target, which implies that the imaging system must use a shorter wavelength than the HEL beam's and must also compensate for atmospheric effects. The adjustments may require several thousand actuators at visible wavelengths. The accuracy of the adjustments are dependent on the imaging telescope's point spread function, which in turn is a function of the wavelength used. Since the wavelength is different than the HEL wavelength, the number of concommitant adjustments may be either physically impossible to calculate or too expensive to achieve, although the problem could be solved theoretically.

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