Testing the divergence of a beam from a laser

Details Testing the divergence of a beam from a laser Testing the divergence of a beam from a laser

1978-11-29

1980-07-15

Corbin, John K.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

042125405

ABSTRACT:
Apparatus to test the divergence of a beam from a laser includes a beam expander, aperture-forming means, an off-axis parabolic mirror positioned to image the beam from the aperture in a Fraunhofer plane, and a vidicon camera to translate the spatial distribution of light energy along a horizontal line in the Fraunhofer plane to an electrical signal indicating the difference between a light energy peak and a light energy valley. The aperture-forming means includes a V-shaped slit which is movable relative to a member with a horizontal slit so that the aperture formed can be changed from a single aperture to two apertures having an increasing separation. The amount of separation of the apertures when the electrical signal goes through zero is an inverse measure of the divergence of the light beam from the laser under test.

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