Patent US4949345A successfully refreshed from Google Patents.
US4949345A
Expired / Lapsed
US
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Method and apparatus for reducing the effect of random polarization on the power/energy output of lasers
Assignee: Rateze Remote Mgmt LLC
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Filing: 1989-06-30
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Granted: 1990-08-14
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Expires: 2009-06-30
Abstract
Abstract The effects of random polarization of a laser beam is reduced by separating the polarized laser beam into first and second polarized components that are orthogonal to each other, and measuring the energy in each of the first and second components. The total energy in both of the first and second components are compared with a predetermined energy level. The energy output of the laser beam is controlled in response to the measured comparison.
Inventors
- 👤 Nicolaas G. Luijtjes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:06
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/13; H01S3/131
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A method of reducing the effects of random polarization on the output uniformity of a generated laser beam with random polarization comprising, separating a fraction of the laser beam into first and second polarized components that are orthogonal to each other, measuring the energy in each of the first and second components, measuring the total energy in both of the first and second components, comparing the total energy with a predetermined energy set point, and controlling the energy output of the laser beam in response to the comparison of the total energy with the set point.
Claim 2
Independent Claim
96 words
A method of reducing the effects of random polarization on the output uniformity of a generated laser beam with random polarization comprising, separating a fraction of the laser beam into first and second polarized components that are orthogonal to each other, measuring the energy in each of the first and second components, measuring the total energy in both of the first and second components, comparing the total energy with a predetermined energy set point, and controlling the energy output of the laser beam in response to the comparison of the total energy with the set point.
Claim 3
Dependent Claim
20 words
The method of claim 1 including, integrating the total energy prior to comparing the energy with a predetermined set point.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein the energy is controlled by turning the laser off and on.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the energy is controlled by controlling the intensity of the laser.
Claim 6
Independent Claim
104 words
An apparatus for reducing the effects of random polarization on output uniformity of polarized laser beams comprising, first and second polarizing beam splitters positioned in the polarized laser beam and positioned orthogonal to each other, said first and second beam splitters each reflecting a portion of the laser beam, laser detecting and measuring means detecting and measuring the reflected polarized energy from each of the beam splitters, comparator means comparing the sum of the measured energy from both of the beam splitters with a predetermined energy level, and control means between the comparator and the laser for controlling the output energy of the laser.
Claim 7
Independent Claim
104 words
An apparatus for reducing the effects of random polarization on output uniformity of polarized laser beams comprising, first and second polarizing beam splitters positioned in the polarized laser beam and positioned orthogonal to each other, said first and second beam splitters each reflecting a portion of the laser beam, laser detecting and measuring means detecting and measuring the reflected polarized energy from each of the beam splitters, comparator means comparing the sum of the measured energy from both of the beam splitters with a predetermined energy level, and control means between the comparator and the laser for controlling the output energy of the laser.
Claim 8
Dependent Claim
18 words
The apparatus of claim 5 including, an integrator between the laser detecting and measuring means and the comparator.
Claim 9
Dependent Claim
25 words
The apparatus of claim 5 wherein the first and second polarizing beam splitters are dielectric windows, and the laser detecting and measuring means are photodiodes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |