Patent US3736040A successfully refreshed from Google Patents.
US3736040A
Expired / Lapsed
US
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Coherence extender for q-switched lasers for use in halography
Assignee: TRW Data Systems Inc
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Filing: 1970-12-28
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Granted: 1973-05-29
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Expires: 1990-12-28
Abstract
Abstract The coherence of Q-switched, solid state lasers, such as ruby lasers, is improved by employing an intracavity optical element, such as an etalon, positioned between the Q-switch and the active laser medium. This permits the laser to be operated reliably at low pumping power levels and enables holograms and interferograms to be obtained consistently.
Inventors
- 👤 S M Zivi
- 👤 G H Humberstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:35
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1123; H01S3/115; G; G01; G01B; G01B9/00; G01B9/02; G01B9/021; G03; G03H; G03H1/00; H01S3/05; H01S3/08; H01S3/081; H01S3/082; H01S3/0823; H01S3/08018; H01S3/08022; H01S3/08031; H01S3/08036
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A holographic system comprising: a laser system including: a primary cavity having a double etalon output reflector and a fixed rear reflector; a laser rod positioned between the two reflectors; a Q-switch positioned between the rear reflector and the laser rod; a partially reflecting solid dielectric etalon oriented parallel to said etalon output reflector and positioned between the Qswitch and the laser rod, said partially reflecting etalon having an overall reflectivity which is substantially less than that of said etalon output reflector, said partially reflecting etalon functioning as a mode selector and forming a secondary cavity with the output reflector; beam splitting means adapted to divide the laser output from said laser system into a reference beam and a scene beam; and a recording medium for recording the reference and scene beams.
Claim 2
Dependent Claim
132 words
A holographic system comprising: a laser system including: a primary cavity having a double etalon output reflector and a fixed rear reflector; a laser rod positioned between the two reflectors; a Q-switch positioned between the rear reflector and the laser rod; a partially reflecting solid dielectric etalon oriented parallel to said etalon output reflector and positioned between the Qswitch and the laser rod, said partially reflecting etalon having an overall reflectivity which is substantially less than that of said etalon output reflector, said partially reflecting etalon functioning as a mode selector and forming a secondary cavity with the output reflector; beam splitting means adapted to divide the laser output from said laser system into a reference beam and a scene beam; and a recording medium for recording the reference and scene beams.
Claim 3
Dependent Claim
32 words
The holographic system of claim 1 in which the partially reflecting etalon has a reflectivity of about 27 percent and the double etalon output reflector has a reflectivity of about 70 percent.
Claim 4
Dependent Claim
15 words
The holographic system of claim 2 in which the partially reflecting etalon consists of sapphire.
Claim 5
Dependent Claim
13 words
The holographic system of claim 1 in which the laser rod comprises ruby.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |