Wide bandwidth optical modal deformation sensor

Details Wide bandwidth optical modal deformation sensor Wide bandwidth optical modal deformation sensor

1980-07-09

1983-06-14

Sikes, William L.

350358, G02F 129

Patent

active

043879667

ABSTRACT:
Wave front deformations resulting, for example, from the interaction of a laser beam with a deformable mirror are measured by causing the beam, or a sampled portion thereof, to interfere with a reference beam having a slightly different frequency in order to produce interference patterns in a detection plane. Spaced-apart detectors in that plane brightness oscillation at the difference frequency; and relative phase differences in these oscillations are used to determine wave front tilt, spherical and astigmatic aberrations, and, possibly, other deformations. Control signals are provided for correcting these wave front deformations by controlling the surface contour of the deformable mirror. The measuring laser beam may intercept the mirror within and as part of a polarization-type interferometer, or the measuring beam may be derived from a high-energy beam. In the former case, the reference beam does not intercept the deformable mirror; in the latter case, the reference beam is also derived from the high-energy beam, but "cleaned" by spatial filtering.

REFERENCES:
Hardy et al., Real-Time Atmospheric Compensation, JOSA vol. 67, No. 3 (Mar. 1977) pp. 360-369.

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