Patent US4330763A successfully refreshed from Google Patents.
US4330763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonantly pumped mid-ir laser
Assignee: United States Department of the Navy
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Filing: 1980-03-19
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Granted: 1982-05-18
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Expires: 2000-03-19
Abstract
Abstract A solid-state laser operative in the mid infrared region (3-5 μm) comprises a YLF laser including a trivalent terbium activator which is pumped by a resonant external laser source (Ho:YLF, 2.06 μm laser) to directly populate the upper laser level which achieves inversion before non-radiative decay depletes the initial laser-level population. The initial laser manifold that is externally pumped is the 7 F 2 manifold. Inversion is then between the 7 F 3 and 7 F 5 manifolds and laser oscillation at 4.1 μm is obtained.
Inventors
- 👤 Leon Esterowitz
- 👤 Melvin R. Kruer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:08
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; H01S3/1601; H01S3/1603; H01S3/1605; H01S3/163; H01S3/1645; H01S3/1653
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
An optically pumped solid-state laser which comprises: a laser cavity; a laser medium including trivalent terbium-doped yttrium lithium fluoride crystal that is capable of lasing at about 4.1 μm disposed within said laser cavity; and resonant pumping means for supplying pump energy of a predetermined infrared wavelength to said laser medium to achieve laser oscillation at about 4.1 μm.
Claim 2
Dependent Claim
59 words
An optically pumped solid-state laser which comprises: a laser cavity; a laser medium including trivalent terbium-doped yttrium lithium fluoride crystal that is capable of lasing at about 4.1 μm disposed within said laser cavity; and resonant pumping means for supplying pump energy of a predetermined infrared wavelength to said laser medium to achieve laser oscillation at about 4.1 μm.
Claim 3
Dependent Claim
29 words
An optically pumped solid-state laser as claimed in claim 1 wherein: said resonant pumping means is a holmium-doped yttrium lithium fluoride crystal having an output of about 2.06 μm.
Claim 4
Dependent Claim
92 words
An optically pumped laser comprising: a laser cavity; a laser medium of trivalent terbium-doped yttrium lithium fluoride crystal having a plurality of energy levels including the 7 F 2 , the 7 F 3 and 7 F 5 energy levels disposed within said laser cavity; and resonant pumping means for supplying energy of a given wavelength to said laser medium in order to populate the 7 F 2 energy level thereof which will result in laser oscillation at about 4.1 μm between the 7 F 3 and 7 F 5 energy levels.
Claim 5
Dependent Claim
92 words
An optically pumped laser comprising: a laser cavity; a laser medium of trivalent terbium-doped yttrium lithium fluoride crystal having a plurality of energy levels including the 7 F 2 , the 7 F 3 and 7 F 5 energy levels disposed within said laser cavity; and resonant pumping means for supplying energy of a given wavelength to said laser medium in order to populate the 7 F 2 energy level thereof which will result in laser oscillation at about 4.1 μm between the 7 F 3 and 7 F 5 energy levels.
Claim 6
Dependent Claim
28 words
An optically pumped laser as defined in claim 3, wherein: said resonant pumping means is a holmium-doped yttrium lithium fluoride crystal having an output of about 2.06 μm.
Claim 7
Dependent Claim
45 words
An optically pumped laser which comprises: a laser cavity; a laser medium of trivalent terbium-doped yttrium lithium fluoride crystal within said laser cavity; and resonant pumping means of holmium-doped yttrium lithium fluoride crystal for supplying pump energy to said laser medium to achieve laser oscillation.
Claim 8
Dependent Claim
45 words
An optically pumped laser which comprises: a laser cavity; a laser medium of trivalent terbium-doped yttrium lithium fluoride crystal within said laser cavity; and resonant pumping means of holmium-doped yttrium lithium fluoride crystal for supplying pump energy to said laser medium to achieve laser oscillation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |