US4039970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state laser device with light filter
Assignee: NEC Corp
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Filing: 1975-11-12
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Granted: 1977-08-02
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Expires: 1995-11-12
Abstract
Abstract A laser device includes a solid state laser element consisting of a yttrium aluminate crystal and a source of pumping light. A light filter which intercepts and removes pumping light components having wave-lengths below about 5,000A is disposed between the laser element and the light source. The removal of these selected higher frequency components lowers the oscillation threshold value and increases the laser output.
Inventors
- 👤 Ken-ichi Shiroki
- 👤 Katsumi Mori
- 👤 Yasuhiko Kuwano
- 👤 Seiichi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:06
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; H01S3/092; H01S3/093; H01S3/0931
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
An improved laser device comprising a solid state laser element consisting of a yttrium aluminate crystal having a pumping band defined by predetermined lower and upper wavelengths, a source of pumping light, and a light filter means for intercepting and removing pumping light components having wavelengths below about 5,000A at least some of which are above the lower wavelength limit of the pumping band, the filter means being disposed between the laser element and the light source, whereby the removal of higher frequency components of the pumping light results in a lower oscillation threshhold and increased laser output.
Claim 2
Dependent Claim
98 words
An improved laser device comprising a solid state laser element consisting of a yttrium aluminate crystal having a pumping band defined by predetermined lower and upper wavelengths, a source of pumping light, and a light filter means for intercepting and removing pumping light components having wavelengths below about 5,000A at least some of which are above the lower wavelength limit of the pumping band, the filter means being disposed between the laser element and the light source, whereby the removal of higher frequency components of the pumping light results in a lower oscillation threshhold and increased laser output.
Claim 3
Dependent Claim
30 words
The laser device of claim 1, further comprising a light condenser having an elliptical cross-section, the laser element and the light source being located at the foci of said ellipse.
Claim 4
Dependent Claim
17 words
The laser device of claim 1, wherein the laser element contains approximately one atomic percent neodymium ions.
Claim 5
Dependent Claim
17 words
The laser device of claim 1, wherein the laser element contains approximately 0.5 atomic percent erbium ions.
Claim 6
Dependent Claim
82 words
An improved laser device comprising a solid state laser element consisting of a yttrium aluminate crystal having a pumping band extending from about 3,500A to 9,000A, a source of pumping light, and a light filter means for intercepting and removing pumping light components having wavelengths below about 5,000A, the filter means being disposed between the laser element and the light source, whereby the removal of higher frequency components of the pumping light results in a lower oscillation threshhold and increased laser output.
Claim 7
Dependent Claim
82 words
An improved laser device comprising a solid state laser element consisting of a yttrium aluminate crystal having a pumping band extending from about 3,500A to 9,000A, a source of pumping light, and a light filter means for intercepting and removing pumping light components having wavelengths below about 5,000A, the filter means being disposed between the laser element and the light source, whereby the removal of higher frequency components of the pumping light results in a lower oscillation threshhold and increased laser output.
Claim 8
Dependent Claim
18 words
The laser device of claim 5, wherein the laser element contains about one atomic weight of neodymium ion.
References Cited (Backward Citations)
US3634779A
Cited
US3614662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |