US4201954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas discharge laser for generating linearly polarized radiation
Assignee: US Philips Corp
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Filing: 1978-05-19
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Granted: 1980-05-06
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Expires: 1998-05-19
Abstract
Abstract A gas discharge laser includes one or more birefringent layers in a multi-layer reflector that provides such a large difference in reflection of light polarized linearly in two mutually perpendicular directions that the laser generates 100% linearly polarized light in one direction only. In the other directions the reflection is insufficient to obtain stimulated emission.
Inventors
- 👤 Johannes Van der Wal
- 👤 Gijsbertus Bouwhuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:48
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08059; G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G02B5/286; G02B5/30; G02B5/3025; G02B5/3033; H01S3/08054
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A gas discharge laser for generating linearly polarized radiation, comprising a laser tube and a set of two reflectors the optical axis of which coincides with the axis of the laser tube, said reflectors being composed of at least a substrate on which a number of layers are provided which preferably have a quarter wavelength thickness and alternately comprise two dielectric materials having different indices of refraction, at least one of the said reflectors reflecting anisotropically, and wherein at least one of thelayers of the anisotropic reflector is so strongly anisotropic that the difference in reflection of the reflector for light polarized in two mutually perpendicular directions is at least 0.5%.
Claim 2
Dependent Claim
111 words
A gas discharge laser for generating linearly polarized radiation, comprising a laser tube and a set of two reflectors the optical axis of which coincides with the axis of the laser tube, said reflectors being composed of at least a substrate on which a number of layers are provided which preferably have a quarter wavelength thickness and alternately comprise two dielectric materials having different indices of refraction, at least one of the said reflectors reflecting anisotropically, and wherein at least one of thelayers of the anisotropic reflector is so strongly anisotropic that the difference in reflection of the reflector for light polarized in two mutually perpendicular directions is at least 0.5%.
Claim 3
Dependent Claim
44 words
A gas discharge laser as claimed in claim 1, wherein at least three of the layers of the anisotropic reflector are so strongly anisotropic that the difference in reflection of said reflector for light polarized in two mutually perpendicular directions is at least 3%.
Claim 4
Dependent Claim
68 words
A gas discharge laser as claimed in claim 2, wherein the reflector is composed as follows: S(H.sub.1,2 L).sup.x H L H, wherein S is the substrate of the reflector H 1 ,2 are birefringent layers having high indices of refraction L are layers having a lower index of refraction H are layers having a high index of refraction, and x has the values 2, 3, 4 or 5.
References Cited (Backward Citations)
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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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |