US4907885A
Expired / Lapsed
US
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Heterodyne laser diagnostic system
Assignee: United States Department of Energy
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Filing: 1989-01-17
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Granted: 1990-03-13
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Expires: 2009-01-17
Abstract
Abstract The heterodyne laser diagnostic system includes, in one embodiment, an average power pulsed laser optical spectrum analyzer for determining the average power of the pulsed laser. In another embodiment, the system includes a pulsed laser instantaneous optical frequency measurement for determining the instantaneous optical frequency of the pulsed laser.
Inventors
- 👤 Michael A. Globig
- 👤 Michael A. Johnson
- 👤 Richard W. Wyeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:10
CPC Classifications
G; G01; G01J; G01J9/00; G01J9/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A laser optical spectrum analyzer comprising a pulsed laser for generating a series of pulsed laser beams, a continuous wave (CW) laser for generating a continuous wave (CW) laser beam, means for measuring the average power spectrum of said series of pulsed laser beams, including means for heterodyning said series of pulsed laser beams with said CW laser beam to from a heterodyned output, including means for detecting the heterodyned output, means for analyzing said heterodyned output, including means for sampling the output of said analyzing means, and means for plotting the average frequency spectrum with respect to time of said series of pulsed laser beams.
Claim 2
Dependent Claim
106 words
A laser optical spectrum analyzer comprising a pulsed laser for generating a series of pulsed laser beams, a continuous wave (CW) laser for generating a continuous wave (CW) laser beam, means for measuring the average power spectrum of said series of pulsed laser beams, including means for heterodyning said series of pulsed laser beams with said CW laser beam to from a heterodyned output, including means for detecting the heterodyned output, means for analyzing said heterodyned output, including means for sampling the output of said analyzing means, and means for plotting the average frequency spectrum with respect to time of said series of pulsed laser beams.
Claim 3
Independent Claim
93 words
A system for measuring the instantaneous frequencies of a series of pulsed laser beams comprising a pulsed laser for generating a series of pulsed laser beams comprising a pulsed laser for generating a series of pulsed laser beams, a continuous wave (CW) laser for generating a continuous wave laser beam, means for heterodyning said series of pulsed laser beams with said CW laser beam to form a heterodyned output, and means for analyzing in the time domain said heterodyned output to provide a plot of the instantaneous frequency of said pulsed laser beams.
Claim 4
Independent Claim
93 words
A system for measuring the instantaneous frequencies of a series of pulsed laser beams comprising a pulsed laser for generating a series of pulsed laser beams comprising a pulsed laser for generating a series of pulsed laser beams, a continuous wave (CW) laser for generating a continuous wave laser beam, means for heterodyning said series of pulsed laser beams with said CW laser beam to form a heterodyned output, and means for analyzing in the time domain said heterodyned output to provide a plot of the instantaneous frequency of said pulsed laser beams.
Claim 5
Dependent Claim
50 words
A laser heterodyne processing system comprising means for heterodyning a continuous wave laser beam with a series of pulsed laser beams having a frequency to be determined to form a plurality of laser heterodyne signals, and processing means for determining the average instantaneous frequency versus time of said laser beams.
Claim 6
Dependent Claim
50 words
A laser heterodyne processing system comprising means for heterodyning a continuous wave laser beam with a series of pulsed laser beams having a frequency to be determined to form a plurality of laser heterodyne signals, and processing means for determining the average instantaneous frequency versus time of said laser beams.
Claim 7
Dependent Claim
36 words
A system as in claim 3 wherein said laser heterodyne signals include a low frequency envelope signal and wherein said processing means include means for removing the low frequency envelope signal from said laser heterodyne signals.
Claim 8
Dependent Claim
19 words
A system as in claim 4 wherein said processing means include means for amplitude normalizing said laser heterodyne signals.
Claim 9
Dependent Claim
38 words
A system as in claim 5 wherein said means for amplitude normalizing include means for holding the zero crossing points of said laser heterodyne signals fixed and means for stretching all the individual half-cycles to a constant value.
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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |