Focussed laser beam optical system

Details Focussed laser beam optical system Focussed laser beam optical system

1979-05-29

1981-12-08

Corbin, John K.

G02B 900

Patent

active

043044670

ABSTRACT:
The focal range of a focussed laser beam is enlarged with a simple optical stop where the beam has a Gaussian cross-sectional profile. The stop is arranged between the laser producing the beam, and a beam focussing lens system, and it is provided with an aperture of predetermined diameter with respect to that of the laser beam whereby the outer portion of the beam represented by the low intensity skirts of the profile curve is stopped. This arrangement can influence the focal range up to a 75 percent increase over that obtained with the unstopped beam.

REFERENCES:
patent: 3750189 (1973-07-01), Fleischer
patent: 3787107 (1974-01-01), Sick et al.
patent: 3801182 (1974-04-01), Jones
patent: 3980397 (1976-09-01), Judd et al.
patent: 4030817 (1977-06-01), Westell
Holmes, D. A., et al., "Parametric Study of Apertured Focused Gaussian Beams," Applied Optics, vol. 11, No. 3, pp. 565-574, Mar. 1972.
Haskal, H. M., et al., "Power and Focusing Considerations for Recording with a Laser Beam in the TEMoo Mode" Applied Optics, vol. 10, No. 6, pp. 1354-1358, Jun. 1971.
Cox, A., Optics, The Focal Press, London & N.Y. pp. 68-73, Apr. 1957.
Pernick, B. J., "Irradiance Uniformity and Power Loss . . . ", Rev. Sci. Instr. vol. 45, Nr 11, Nov. 1974, 1344-1346.

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