Controlling radiation beam diameters

Details Controlling radiation beam diameters Controlling radiation beam diameters

1987-01-22

1988-07-19

LaRoche, Eugene R.

Coherent light generators

Particular component circuitry

Optical pumping

350387, 372705, G02D 530, G02F 103

Patent

active

047580682

ABSTRACT:
The invention relates to a method and an apparatus for reducing the diameter tolerance of a laser beam. A lens (3) is positioned so that one of the focal planes of the lens (3) is in the region of a limit (5) of the Rayleigh range of the beam (19). The lens (3) forms a second beam waist at a position (6), where a modulator (10) is placed. The beam (21) then passes through beam expansion apparatus (11,12,13) before being collimated by a lens (14). The collimated beam (25) is then focussed to a third beam waist at the recording drum (17), via a lens (18) and mirror (15).

REFERENCES:
patent: 3531180 (1970-09-01), Fleisher et al.
patent: 3625585 (1971-12-01), Beiser
patent: 4312588 (1982-01-01), Minoura et al.
patent: 4676586 (1987-06-01), Jones et al.
patent: 4681396 (1982-07-01), Jones

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