US4949348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue-green upconversion laser
Assignee: United States Department of Energy
•
Filing: 1989-08-25
•
Granted: 1990-08-14
•
Expires: 2009-08-25
Abstract
Abstract A blue-green laser (450-550 nm) uses a host crystal doped with Tm 3+ . The Tm + is excited through upconversion by a red pumping laser and an IR pumping laser to a state which transitions to a relatively lower energy level through emissions in the blue-green band, e.g., 450.20 nm at 75 K. The exciting laser may be tunable dye lasers or may be solid-state semiconductor laser, e.g., GaAlAs and InGaAlP.
Inventors
- 👤 Dinh C. Nguyen
- 👤 George E. Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:37
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/094; H01S3/094092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A blue-green laser comprising: a. a laser rod having a host crystal doped with Tm 3+ ; b. a first pumping laser to excite said Tm 3+ from a ground state to a first excited in the 3 H 4 manifold; and c. a second pumping laser effective to excite said Tm 3+ from said first state to a second excited state in the 1 D 2 manifold for transition to a relatively low state in the 3 H 6 manifold at a wavelength in said blue-green range.
Claim 2
Dependent Claim
88 words
A blue-green laser comprising: a. a laser rod having a host crystal doped with Tm 3+ ; b. a first pumping laser to excite said Tm 3+ from a ground state to a first excited in the 3 H 4 manifold; and c. a second pumping laser effective to excite said Tm 3+ from said first state to a second excited state in the 1 D 2 manifold for transition to a relatively low state in the 3 H 6 manifold at a wavelength in said blue-green range.
Claim 3
Dependent Claim
17 words
A blue-green laser according to claim 1, wherein said first and second pumping lasers are dye lasers.
Claim 4
Dependent Claim
27 words
A blue-green laser according to claim 2, wherein said first pumping laser is at about 781 nm and said second pumping laser is at about 649 nm.
Claim 5
Dependent Claim
27 words
A blue-green laser according to claim 1, wherein said first pumping laser is a GaAlAs laser diode and said second pumping laser is an InGaAlP laser diode.
Claim 6
Independent Claim
95 words
A method for generating coherent blue-green light from a host crystal doped with Tm 3+ , including the steps of: a. irradiating said Tm 3+ at a first wavelength effective to excite said Tm 3+ to a first state in the 3 H 4 manifold; and irradiating said Tm 3+ at a second wavelength effective to excite said Tm 3+ from said first state to a second state in the 1 D 2 manifold effective to transition to a relatively low state in the 3 H 6 manifold at a wavelength in said blue-green range.
Claim 7
Independent Claim
95 words
A method for generating coherent blue-green light from a host crystal doped with Tm 3+ , including the steps of: a. irradiating said Tm 3+ at a first wavelength effective to excite said Tm 3+ to a first state in the 3 H 4 manifold; and irradiating said Tm 3+ at a second wavelength effective to excite said Tm 3+ from said first state to a second state in the 1 D 2 manifold effective to transition to a relatively low state in the 3 H 6 manifold at a wavelength in said blue-green range.
Claim 8
Dependent Claim
22 words
A method according to claim 5, wherein said first wavelength is about 781 nm and said second wavelength is about 649 nm.
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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |