Mid-Infrared Laser Beam Diagnostic Wavefront Analyzer

Rex Goranson; Joe Blea; Art Chipps; Grant Denton; Jeff Houchard

doi:10.1117/12.944228

15 August 1988 Mid-Infrared Laser Beam Diagnostic Wavefront Analyzer

Rex Goranson, Joe Blea, Art Chipps, Grant Denton, Jeff Houchard

Proceedings Volume 0888, Laser Beam Radiometry; (1988) https://doi.org/10.1117/12.944228
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

The Rockwell Wavefront Analyzer (RWA) is an integrated beam diagnostic tool developed for the US Army, STEWS, WSMR, for the MIRACL device. It accepts a 2.5 cm square nominally collimated DF laser beam input of approximately 5 W power level. The electrical signals are reduced and analyzed by an on-line computer processor. The ultimate outputs are plots including total beam power and angular jitter in the x and y axes, an irradiance map of the beam on a 32 X 32 square grid, and a wavefront map of the beam on the same grid. Wavefront aberration poly-nomial coefficient listings are also generated. The wavefront is obtained from measurements of its local slope in two axes by means of a classical Hartmann test done by scanning the pupil with holes in a rotating drum. Earlier versions of this instrument we called SHAPE, for Scanning Hartmann Analyzer Plate Experiment. This design would be SHAPE IV. A single indium antimonide photopot detector measures the transverse ray aberrations, which are then subjected to elaborate processing to extract the polynomial wavefront coefficients. Another photopot is the jitter sensor. Each photopot measures power to normalize the X and Y signals; these "Z" signals also provide the beam power and local irradiance signals.

Citation Download Citation

Rex Goranson, Joe Blea, Art Chipps, Grant Denton, and Jeff Houchard "Mid-Infrared Laser Beam Diagnostic Wavefront Analyzer", Proc. SPIE 0888, Laser Beam Radiometry, (15 August 1988); https://doi.org/10.1117/12.944228

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