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US3611231A
Expired / Lapsed
US
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Q-switched frequency doubling laser
Assignee: United States Department of the Army
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Filing: 1969-11-17
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Granted: 1971-10-05
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Expires: 1989-11-17
Abstract
Abstract This invention relates to a Q-switched laser wherein a single nonlinear optical crystal positioned in a laser cavity performs both the functions of Q-switching and frequency multiplication.
Inventors
- 👤 Claire E Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:45
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1123; H01S3/115; H01S3/106; H01S3/108; H01S3/109
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A laser device comprising a pair of spaced energy reflecting means bounding a cavity resonator, an active laser medium displaced within said cavity resonator for producing a laser beam of a predetermined frequency, laser Q-switching means disposed within said cavity resonator including a nonlinear optical crystal disposed in the path of said laser beam and operating at the crystal phase match temperature and an analyzer for transmitting only optical energy of a selected plane of polarization, said crystal shifting the plane of polarization of the laser beam from said selected plane of polarization in response to application of a control electric field thereto to Qswitch said laser, said crystal generating a harmonic of the fundamental frequency of said laser beam in the absence of said control electric field.
Claim 2
Dependent Claim
128 words
A laser device comprising a pair of spaced energy reflecting means bounding a cavity resonator, an active laser medium displaced within said cavity resonator for producing a laser beam of a predetermined frequency, laser Q-switching means disposed within said cavity resonator including a nonlinear optical crystal disposed in the path of said laser beam and operating at the crystal phase match temperature and an analyzer for transmitting only optical energy of a selected plane of polarization, said crystal shifting the plane of polarization of the laser beam from said selected plane of polarization in response to application of a control electric field thereto to Qswitch said laser, said crystal generating a harmonic of the fundamental frequency of said laser beam in the absence of said control electric field.
Claim 3
Dependent Claim
40 words
A laser device according to claim 1 wherein said crystal provides a displacement of the plane of polarization of said fundamental and harmonic and wherein said analyzer is a prism for directing the harmonic and fundamental along different optical paths.
Claim 4
Dependent Claim
14 words
A laser device according to claim 1 wherein said harmonic is the second harmonic.
Claim 5
Dependent Claim
14 words
A laser device according to claim 2 wherein said harmonic is the second harmonic.
Claim 6
Dependent Claim
42 words
A laser device according to claim 1 wherein said crystal is of the symmetry class trigonal 3m, said laser beam travels in the direction of the z-axis of said crystal and said electric field is applied along the x-axis of said crystal.
Claim 7
Dependent Claim
43 words
A laser device according to claim 1 wherein said crystal is of the crystal symmetry class orthorhombic mm2, said laser beam travels in a direction of the x-axis of said crystal and said electric field is applied along the y-axis of said crystal.
Claim 8
Dependent Claim
13 words
A laser device according to claim 5 wherein said crystal is lithium hiobate.
Claim 9
Dependent Claim
14 words
A laser device according to claim 6 wherein said crystal is barium sodium hiobate.
References Cited (Backward Citations)
US3497828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |