US4490822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cr-Doped yttrium gallium garnet laser
Assignee: Honeywell International Inc
•
Filing: 1982-06-17
•
Granted: 1984-12-25
•
Expires: 2002-06-17
Abstract
Abstract A broadly wavelength-tunable laser is provided which comprises as the laser medium a single crystal of YGG:Cr 3+ . The laser may be operated over a broad temperature range from cryogenic temperatures to elevated temperatures. Emission is in a spectral range from red to infrared, and the laser is useful in the fields of defense, communications, isotope separation, photochemistry, etc.
Inventors
- 👤 John C. Walling
- 👤 Michael L. Shand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:27
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/025; H01S3/05; H01S3/06; H01S3/0602; H01S3/0606; H01S3/061; H01S3/09; H01S3/091; H01S3/0915; H01S3/094; H01S3/14; H01S3/16; H01S3/1601; H01S3/162; H01S3/1623; H01S3/163; H01S3/164; H01S3/23; H01S3/2308
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A laser comprising: a laser medium comprising a single crystal of Y 3 Ga 5 O 12 :Cr 3+ , in which the Cr 3+ concentration is in the range between about 0.005 and about 20 atom percent with respect to gallium sites, pump means for exciting the laser medium to emit coherent radiation, and an optical resonant cavity for supporting coherent radiation emitted by the laser medium.
Claim 2
Dependent Claim
68 words
A laser comprising: a laser medium comprising a single crystal of Y 3 Ga 5 O 12 :Cr 3+ , in which the Cr 3+ concentration is in the range between about 0.005 and about 20 atom percent with respect to gallium sites, pump means for exciting the laser medium to emit coherent radiation, and an optical resonant cavity for supporting coherent radiation emitted by the laser medium.
Claim 3
Dependent Claim
27 words
The laser of claim 1 in which the laser medium is substantially in the shape of a cylindrical rod whose long dimension is along the cylinder axis.
Claim 4
Dependent Claim
31 words
The laser of claim 1 in which the laser medium is substantially in the shape of a slab having a substantially rectangular cross-section in a plane normal to its long dimension.
Claim 5
Dependent Claim
24 words
The laser of claim 1 in which the pump means comprises a pulsed incoherent light source emitting at wavelengths shorter than about 700 nm.
Claim 6
Dependent Claim
24 words
The laser of claim 1 in which the pump means comprises a continuous incoherent light source emitting at wavelengths shorter than about 700 nm.
Claim 7
Dependent Claim
24 words
The laser of claim 1 in which the pump means comprises a pulsed coherent light source emitting at wavelengths shorter than about 700 nm.
Claim 8
Dependent Claim
24 words
The laser of claim 1 in which the pump source comprises a continuous coherent light source emitting at wavelengths shorter than about 700 nm.
Claim 9
Dependent Claim
12 words
The laser of claim 1 further comprising means for Q-switching the laser.
Claim 10
Dependent Claim
16 words
The laser of claim 1 further comprising means for controlling the temperature of the laser medium.
Claim 11
Dependent Claim
21 words
The laser of claim 1 further comprising means for tuning the coherent radiation in a spectral range from red to infrared.
Claim 12
Dependent Claim
53 words
The laser of claim 1 further comprising: a second laser medium comprising a single crystal of Y 3 Ga 5 O 12 :Cr 3+ , said second laser medium positioned in the beam of coherent radiation; and pump means for exciting the second laser medium to emit an amplified beam of coherent radiation.
References Cited (Backward Citations)
US3997853A
Cited
US4272733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |