US4044316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized cavity-dumped nd:yag laser
Assignee: United States Department of the Air Force
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Filing: 1976-04-19
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Granted: 1977-08-23
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Expires: 1996-04-19
Abstract
Abstract In cavity dumped state lasers the relaxation oscillations caused by cavity dumping are stabilized and damped out by placing a non-linear second-harmonic generation crystal inside the optical cavity of the laser and phase-matching it to produce a doubled frequency component of approximately 0.1% that of the circulating power. The degree of damping depends on the conversion percentage, which may be varied by temperature controlling the frequency doubling crystal. A conventional antireflection coating is placed on the crystal to minimize losses.
Inventors
- 👤 Chandler J. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:57
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1106; H01S3/1109; H01S3/106; H01S3/107; H01S3/1075; H01S3/05; H01S3/08; H01S3/08018; H01S3/0804; H01S3/0805; H01S3/108; H01S3/109; H01S3/1103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
In a cavity dumped, solid state laser having an optical cavity with circulating power of a fundamental frequency and wherein the laser output frequency is only at said fundamental frequency, said laser having a solid state laser element in said optical cavity, an improvement for decreasing relaxation oscillations associated with dumping, wherein said improvement comprises: a. a second harmonic generation crystal for generating second harmonic power from said fundamental frequency circulating power positioned in said optical cavity in intercepting relationship with said fundamental circulating power; and b. means for controlling the temperature of said second harmonic generation crystal to provide a second harmonic power of approximately 0.05% to 0.1% of said fundamental frequency circulating power, whereby relaxation oscillations associated with dumping are decreased.
Claim 2
Dependent Claim
123 words
In a cavity dumped, solid state laser having an optical cavity with circulating power of a fundamental frequency and wherein the laser output frequency is only at said fundamental frequency, said laser having a solid state laser element in said optical cavity, an improvement for decreasing relaxation oscillations associated with dumping, wherein said improvement comprises: a. a second harmonic generation crystal for generating second harmonic power from said fundamental frequency circulating power positioned in said optical cavity in intercepting relationship with said fundamental circulating power; and b. means for controlling the temperature of said second harmonic generation crystal to provide a second harmonic power of approximately 0.05% to 0.1% of said fundamental frequency circulating power, whereby relaxation oscillations associated with dumping are decreased.
Claim 3
Dependent Claim
17 words
The improvement as claimed in claim 1 wherein the solid state laser element is a Nd:YAG crystal.
Claim 4
Dependent Claim
23 words
The improvement as claimed in claim 2 wherein the said second harmonic generation crystal is a Ba 2 Na(NbO 3 ) 5 crystal.
References Cited (Backward Citations)
US3804490A
Cited
US3947780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |