Method and apparatus for focussing laser beams

Details Method and apparatus for focussing laser beams Method and apparatus for focussing laser beams

1974-09-16

1976-08-03

Corbin, John K.

Electric heating

Microwave heating

Tunnel furnace

219121L, 350293, G02B 510

Patent

active

039725995

ABSTRACT:
A method of focussing a laser beam having a ring-shaped cross-section to provide a depth of focus for use in cutting and the like, in which the laser beam is converged to and through a focus by reflection from a concave mirror, and in which the diverging laser beam emanating from the focus is passed into an axicon having a substantially cylindrical inner reflective surface for reflecting the diverging laser beams back to an elongated focus. In its apparatus form, focussing means is provided together with a substantially cylindrical axicon positioned to intercept said diverging laser beam and to bring it back to a focus along an extended axis. The cylindrical axicon is preferably formed from a pair of telescoped tubular members having a closed annular space therein for receiving a cooling fluid, with the inner cylinder having its inner surface highly polished and/or coated with some material to minimize the absorption of the incident laser beam.

REFERENCES:
patent: 2759393 (1956-08-01), McLeod
patent: 3621198 (1971-11-01), Herbrich
patent: 3696230 (1972-10-01), Friedrich
McLeod, Journal of the Optical Society of America, vol. 44, No. 8, Aug., 1954, pp. 592-597.

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