Antibow device for lasers

Details Antibow device for lasers Antibow device for lasers

1992-05-14

1994-11-29

Ben, Loha

Optical: systems and elements

Light dispersion

359 17, 359209, 359566, 359831, 235457, G02B 504, G02B 532, G02B 2608, G06K 710

Patent

active

053695267

ABSTRACT:
A device for use in a system of hologon deflection of a laser beam having a wavelength .lambda. at a rotating angle .theta..sub.R to produce a scan line. The device comprises a prism having a grating on at least one surface. The prism is positioned to deflect the scan line after hologon deflection of the laser beam. The prism has an apex angle between scan line intersecting surfaces of .theta..sub..alpha.. The grating has a grating spacing D. Deflection of the scan line by the angle .theta..sub..alpha. is designed so that it is equal to the deflection of the scan line by the grating. This produces a scan line having bow of less than 1/600 of the bow of the scan line without the prism and effectively eliminates wobble. The range for the apex angle .theta..sub..alpha. may be from about 1.degree. to about 30.degree., and preferably from about 2.degree. to about 6.degree.. The grating spacing ranges from about 0.0001 to about 0.001 millimeter.

REFERENCES:
patent: 4707055 (1987-11-01), Stark
patent: 4973112 (1990-11-01), Kramer
patent: 5046794 (1991-09-01), Ritter et al.

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