US4785462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamically one-mode semiconductor laser
Assignee: Siemens AG
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Filing: 1986-08-18
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Granted: 1988-11-15
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Expires: 2006-08-18
Abstract
Abstract A dynamically one-mode semiconductor laser having a laser diode with a coupled external resonator includes a resonator mirror disposed opposite a light emitting face of the laser diode and a collimation optics between the diode and the resonator mirror. The collimation optics includes a refractive hemispherical micro-lens having flat side applied to the resonator mirror which is manufactured by fusing a small drop of glass onto the resonator mirror.
Inventors
- 👤 Rudolf Keil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:08
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A dynamically one-mode semiconductor laser including a laser diode, comprising: a coupled external resonator having a resonator mirror disposed opposite a light emitting face of said laser diode; and collimation optics disposed between said laser diode and said resonator mirror, said collimation optics including a refractive hemispherical micro-lens, a flat side of said hemispherical micro-lens being directly applied to a mirror surface of said resonator mirror.
Claim 2
Dependent Claim
66 words
A dynamically one-mode semiconductor laser including a laser diode, comprising: a coupled external resonator having a resonator mirror disposed opposite a light emitting face of said laser diode; and collimation optics disposed between said laser diode and said resonator mirror, said collimation optics including a refractive hemispherical micro-lens, a flat side of said hemispherical micro-lens being directly applied to a mirror surface of said resonator mirror.
Claim 3
Dependent Claim
35 words
A dynamically one-mode semiconductor laser as claimed in claim 1, wherein said micro-lens has an arced surface facing said light emitting face of said laser diode and said arced surface includes a single antireflex coating.
Claim 4
Dependent Claim
20 words
A dynamically one-mode semiconductor laser as claimed in claim 1, wherein said resonator mirror is made of a flattened wire.
Claim 5
Dependent Claim
21 words
A dynamically one-mode semiconductor laser as claimed in claim 1, wherein said micro-lens is formed of highly refractive heavy flint glass.
Claim 6
Dependent Claim
28 words
A dynamically one-mode semiconductor laser as claimed in claim 1 wherein said resonator mirror and said micro-lens are formed of materials having essentially coincident coefficients of temperature expansion.
Claim 7
Dependent Claim
28 words
A dynamically one-mode semiconductor laser as claimed in claim 5 wherein said resonator mirror is of platinum-rhodium, and wherein said micro-lens is formed of lanthanum heavy flint glass.
Claim 8
Dependent Claim
89 words
A dynamically single-mode semiconductor laser, comprising: a laser diode having a laser active region along an axis and opposing emitting faces substantially perpendicular to said axis; an external resonator disposed spaced from a first of said emitting faces, said external resonator including a mirror substantially perpendicular to said axis; and a collimation optic member in the form of a hemispherical lens mounted directly on said mirror facing said first emitting face of said laser diode, a radius of curvature of said hemispherical lens being substantially coincident with said axis.
Claim 9
Dependent Claim
89 words
A dynamically single-mode semiconductor laser, comprising: a laser diode having a laser active region along an axis and opposing emitting faces substantially perpendicular to said axis; an external resonator disposed spaced from a first of said emitting faces, said external resonator including a mirror substantially perpendicular to said axis; and a collimation optic member in the form of a hemispherical lens mounted directly on said mirror facing said first emitting face of said laser diode, a radius of curvature of said hemispherical lens being substantially coincident with said axis.
Claim 10
Dependent Claim
47 words
A dynamically single-mode semiconductor laser as claimed in claim 7, wherein said laser diode has a length L 1 between said opposing emitting faces, and wherein said external resonator is spaced from said first emitting face by a distance L 2 and the equation ##EQU2## is satisfied.
Claim 11
Dependent Claim
69 words
A dynamically single-mode semiconductor laser as claimed in claim 7, wherein said external resonator is spaced from said emitting face by a distance L 2 , for ##EQU3## where R L is the radius of said hemispherical lens, n L is the refractive index of said lens material, λ 0 is the wavelength of the laser light and w L is the mean spot width of the laser beam.
References Cited (Backward Citations)
JPS5988888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |