Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1992-01-03
1993-09-14
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Optical output stabilization
372 99, 372108, 372 98, 359559, 359565, H01S 313
Patent
active
052456196
ABSTRACT:
Apparatus for transforming a conventional beam of coherent light, having a Gaussian energy distribution and relatively high divergence, into a beam in which the energy distribution approximates a single, non-zero-order Bessel function and which therefore has much lower divergence. The apparatus comprises a zone plate having transmitting and reflecting zones defined by the pattern of light interference produced by the combination of a beam of coherent light with a Gaussian energy distribution and one having such a Bessel distribution. The interference pattern between the two beams is a concentric array of multiple annuli, and is preferably recorded as a hologram. The hologram is then used to form the transmitting and reflecting zones by photo-etching portions of a reflecting layer deposited on a plate made of a transmitting material. A Bessel beam, containing approximately 50% of the energy of the incident beam, is produced by passing a Gaussian beam through such a Bessel zone plate. The reflected beam, also containing approximately 50% of the incident beam energy and having a Bessel energy distribution, can be redirected in the same direction and parallel to the transmitted beam. Alternatively, a filter similar to the Bessel zone plate can be placed within the resonator cavity of a conventional laser system having a front mirror and a rear mirror, preferably axially aligned with the mirrors and just inside the front mirror to generate Bessel energy distribution light beams at the laser source.
REFERENCES:
patent: 3136959 (1964-06-01), Culver
patent: 3247467 (1966-04-01), Geusic et al.
patent: 3397024 (1968-08-01), Boyden et al.
patent: 3476463 (1969-11-01), Kreuzer
patent: 3560875 (1971-02-01), Macken
patent: 3577094 (1971-05-01), Tomlinson
patent: 3670260 (1972-06-01), Koester et al.
patent: 3980397 (1976-09-01), Judd et al.
patent: 4498184 (1985-02-01), O'Meara
patent: 4553244 (1985-11-01), Benedict et al.
patent: 4887885 (1989-12-01), Durnin et al.
Constant Richard E.
Dixon Harold M.
Jr. Leon Scott
Moser William R.
LandOfFree
Generation of low-divergence laser beams does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Generation of low-divergence laser beams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generation of low-divergence laser beams will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2033721