Solid-state wavefront slope determination

Details Solid-state wavefront slope determination Solid-state wavefront slope determination

1985-11-01

1987-09-01

Laroche, Eugene R.

Optics: measuring and testing

Lamp beam direction or pattern

250201, G01J 100

Patent

active

046905553

ABSTRACT:
An adaptive laser system (10) incorporates a laser (12) and a novel system and method for determining the slope distribution of a laser beam wavefront. The sensor comprises a ramp filter (16) with a continuous monotonically varying transmittance function and two intensity distribution sensors (18 and 20). Lenses (24, 26 and 28) are provided for focusing and collimating the laser beam as appropriate. A processor (22) calculates the slope distribution from the two intensity distributions obtained by the intensity sensors. The slope calculations can be used to determine commands to predistort the laser beam to approximate a desired flat wavefront at the sensor. The transmittance function of the ramp filter is linear and its spatial width is considerably larger than the expected spreading of the beam due to distortions in the wavefront. Accordingly, the slope distribution is calculated by pointwise differencing the intensities, normalizing by dividing by the sum of the intensities, and scaling by a factor of one half. Accordingly, a solid state slope sensor which is fast, reliable, economical, and capable of high-resolution evaluations of pulsed as well as continuous wave laser beams is provided.

REFERENCES:
patent: 4378490 (1983-03-01), d'Auria Luigi
patent: 4490039 (1984-12-01), Bruckler et al.
patent: 4518854 (1985-05-01), Hutchin

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