US3741648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic beam splitter for infrared lasers
Assignee: United States Department of the Air Force
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Filing: 1971-07-16
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Granted: 1973-06-26
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Expires: 1991-07-16
Abstract
Abstract Ultrasonic waves are used to create a pseudograting that diffracts a small fraction of power from a high power infrared laser beam. The deflected portion of beam is analyzed using a scanning type infrared detector. The laser beam acoustic wave interaction occurs in a gaseous medium.
Inventors
- 👤 G Nickel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:36
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/0014; G; G02; G02F; G02F1/00; G02F1/01; G02F1/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
High power infrared laser beam analyzing apparatus comprising; means for deflecting a portion of said laser beam in an air medium, said means including an electromagnetic wave to acoustic wave transducer having its acoustic wave propagating surface in proximate relationship with said laser beam and oriented to transmit transverse waves thereacross for forming an ultrasonic diffraction grating means in the air medium in which said laser beam is located, an oscillator circuit having a power capacity sufficient to electrically drive said transducer connected thereto, said oscillator circuit further comprising means for generating a system clock signal, an infrared scanning detector positioned to scan said deflected laser beam, means for generating a voltage responsive to the scan rate of said detector, a lock-in amplifier, means connecting the output of said detector to said lock-in amplifier, means connecting the system clock signal output to said lock-in amplifier, an oscilloscope, means connecting the output of said lock-in amplifier to the vertical input of said oscilloscope, and means connecting the scan rate responsive voltage to the horizontal input of said oscilloscope.
Claim 2
Dependent Claim
177 words
High power infrared laser beam analyzing apparatus comprising; means for deflecting a portion of said laser beam in an air medium, said means including an electromagnetic wave to acoustic wave transducer having its acoustic wave propagating surface in proximate relationship with said laser beam and oriented to transmit transverse waves thereacross for forming an ultrasonic diffraction grating means in the air medium in which said laser beam is located, an oscillator circuit having a power capacity sufficient to electrically drive said transducer connected thereto, said oscillator circuit further comprising means for generating a system clock signal, an infrared scanning detector positioned to scan said deflected laser beam, means for generating a voltage responsive to the scan rate of said detector, a lock-in amplifier, means connecting the output of said detector to said lock-in amplifier, means connecting the system clock signal output to said lock-in amplifier, an oscilloscope, means connecting the output of said lock-in amplifier to the vertical input of said oscilloscope, and means connecting the scan rate responsive voltage to the horizontal input of said oscilloscope.
References Cited (Backward Citations)
US3324478A
Cited
US3566303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |