Design of a 1-m unobscured infrared collimator and laser tracker test system

Details Design of a 1-m unobscured infrared collimator and laser tracker test system Design of a 1-m unobscured infrared collimator and laser tracker test system

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979spie..193..224l&link_type=abstract

In: Optical systems engineering; Proceedings of the Seminar, San Diego, Calif., August 27, 28, 1979. (A80-39451 16-35) Bellingha

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Applications

Atmospheric Effects, Collimators, Design Analysis, Infrared Imagery, Laser Applications, Optical Tracking, Atmospheric Turbulence, Far Infrared Radiation, Laser Targets, Light Beams, Mirrors

Scientific paper

The large collimator is designed to test laser tracking systems with apertures as large as 1 m. To reduce the 1-m aperture of the large collimator to a reasonable working size, two confocal parabolas (Mersenne) reimage the pupil to 0.1 m with a 1.4-m off-axis parabola decentered 1 m. Near the reimaged pupil two cylindrical mirrors are used to introduce near-field defocus and astigmatism while a two-axis tilt mirror simulates target motion and atmospheric tilts. A second Mersenne reduces the beam size further with the intermediate focus used for far-field atmospheric turbulence and thermal blooming simulation. A bandpass beamsplitter allows the incoming laser beam to proceed to a laser analyzer section, for directional and spot size information, while allowing the infrared radiation from the target to pass to the tracker. A large focal ratio allows for zooming the target by a 'trombone' set of movable mirrors and fixed target. Rotation is provided by a K-mirror image rotator. The optics are chilled in a cold box and situated on an optical bench in a van for transportation.

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