US3937079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calorimeter for an unstable laser resonator
Assignee: United States Department of the Air Force
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Filing: 1974-12-11
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Granted: 1976-02-10
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Expires: 1994-12-11
Abstract
Abstract An internal cavity calorimeter for measuring the output power from an edge coupled unstable laser resonator with a variable rectangular mode geometry while containing the radiation inside the resonator. The 45° output coupling mirror of a conventional edge coupled unstable cavity is replaced by a calorimeter assembly including an absorbing copper plate having a rectangular hole of variable width w and height h to define a rectangular mode of variable width Mw and height Mh within the geometric optics approximation where M is the magnification.
Inventors
- 👤 Richard A. Chodzko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:23
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/003
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
An internal cavity calorimeter for measuring the output power from an edge coupled unstable laser resonator comprising, an absorbing metal plate positioned orthogonal to the cavity axis between the active medium and an output coupling mirror, said plate having an aperture in the central portion thereof, means for varying the size and shape of the aperture in said absorbing metal plate including four separate leaves in perpendicular relationship to one another, each of said leaves being independently movable to produce a corresponding variation of the unstable cavity geometric mode independently for a fixed cavity magnification, and means for independently measuring the power absorbed by each leaf, thereby indicating the lasing intensity distribution pattern for the unstable laser resonator while containing the radiation within the cavity.
Claim 2
Dependent Claim
125 words
An internal cavity calorimeter for measuring the output power from an edge coupled unstable laser resonator comprising, an absorbing metal plate positioned orthogonal to the cavity axis between the active medium and an output coupling mirror, said plate having an aperture in the central portion thereof, means for varying the size and shape of the aperture in said absorbing metal plate including four separate leaves in perpendicular relationship to one another, each of said leaves being independently movable to produce a corresponding variation of the unstable cavity geometric mode independently for a fixed cavity magnification, and means for independently measuring the power absorbed by each leaf, thereby indicating the lasing intensity distribution pattern for the unstable laser resonator while containing the radiation within the cavity.
Claim 3
Dependent Claim
17 words
The internal cavity calorimeter defined in claim 1 wherein said absorbing metal plate is fabricated of copper.
Claim 4
Dependent Claim
49 words
The internal cavity calorimeter defined in claim 1 wherein the absorbing surface of each of said leaves is coated with a black oxide coating and the inner edge of each of said leaves is provided with a thirty degree included angle, thereby making said leaves over 98 percent absorbing.
Claim 5
Dependent Claim
33 words
The internal cavity calorimeter defined in claim 3 wherein the back surface of each of said leaves is made of a diffuse reflector thereby minimizing the spillover of radiation from the absorbing surface.
References Cited (Backward Citations)
US3426293A
Cited
US3289101A
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US3466566A
Cited
US3573656A
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US3622245A
Cited
US3738168A
Cited
US3783685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |