Patent US4510607A successfully refreshed from Google Patents.
US4510607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser end-facet coatings for use in solid or liquid environments
Assignee: United States Department of the Navy
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Filing: 1984-01-03
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Granted: 1985-04-09
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Expires: 2004-01-03
Abstract
Abstract An improvement for a semiconductor laser allows the facet reflectivity to be modified to compensate for the presence of a liquid or transparent solid medium having an index of refraction n m . A first dielectric coating is disposed on an end-facet of the semiconductor laser and has an index of refraction n 1 . A second dielectric coating is disposed on the first dielectric coating and has an index of refraction n 2 . The materials of the dielectric coatings are selected such that the fraction n 1 /n 2 =√n m . Thus the problems associated with reductions of laser facet reflectivity due to being in contact with a surrounding medium which optically is very different from air is overcome.
Inventors
- 👤 Graham A. Garcia
- 👤 Steven J. Cowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:15
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/028
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
An improved semiconductor laser having improved transmission characteristics when transmitting in a liquid or a transparent solid medium having an index of refraction n m comprising: a first dielectric coating disposed on an end-facet of the semiconductor laser having an index of refraction n 1 ; and a second dielectric coating disposed on the first dielectric coating having an index of refraction n 2 , the materials of the dielectric coatings are selected such that n 1 /n 2 =n m .
Claim 2
Dependent Claim
82 words
An improved semiconductor laser having improved transmission characteristics when transmitting in a liquid or a transparent solid medium having an index of refraction n m comprising: a first dielectric coating disposed on an end-facet of the semiconductor laser having an index of refraction n 1 ; and a second dielectric coating disposed on the first dielectric coating having an index of refraction n 2 , the materials of the dielectric coatings are selected such that n 1 /n 2 =n m .
Claim 3
Dependent Claim
29 words
An apparatus according to claim 1 in which the material of the first dielectric coating is magnesium fluoride and the material of the second dielectric coating is aluminum oxide.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2 in which the first dielectric coating and the second dielectric coating are applied to a thickness of one-quarter wavelength.
Claim 5
Independent Claim
82 words
A method of improving the transmission characteristics of a semiconductor laser in a liquid or transparent solid medium having a refractive index of n m comprising: disposing a first dielectric coating on an end-facet of the semiconductor laser having an index of refraction n 1 ; and disposing a second dielectric coating on the first dielectric coating having an index of refraction n 2 , the materials of the dielectric coatings are selected such that n 1 /n 2 =√n m .
Claim 6
Independent Claim
82 words
A method of improving the transmission characteristics of a semiconductor laser in a liquid or transparent solid medium having a refractive index of n m comprising: disposing a first dielectric coating on an end-facet of the semiconductor laser having an index of refraction n 1 ; and disposing a second dielectric coating on the first dielectric coating having an index of refraction n 2 , the materials of the dielectric coatings are selected such that n 1 /n 2 =√n m .
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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |