Patent US3593191A successfully refreshed from Google Patents.
US3593191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically focussed laser diode
Assignee: Siemens AG
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Filing: 1969-09-24
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Granted: 1971-07-13
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Expires: 1989-09-24
Abstract
Abstract A laser diode for producing focused or defined divergent light comprises a semiconductor crystal having a planar PN junction and two parallel end faces extending perpendicular to the PN junction and conjointly forming a resonator for optical radiation. The end faces comprise portions of two confocal surfaces. The PN junction extends between the two confocal surfaces in a radial plane relative to the focal locus. One of the end faces is impermeable to optical radiation and the other of the end faces is a mirror partially permeable to optical radiation.
Inventors
- 👤 Heinz Henker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:40
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/30; H01S5/32; H01S5/02; H01S5/024; H01S5/10; H01S5/022; H01S5/0235; H01S5/02355; H01S5/02365
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A laser diode for producing focused light, comprising a semiconductor crystal having a planar PN junction and two parallel end faces extending perpendicular to the PN junction and conjointly forming a resonator for optical radiation, said end faces comprising portions of two confocal surfaces, said PN junction extending between said two confocal surfaces in a radial plane relative to the focal locus, the one of said end faces at the greater radial distance from the focal locus being impermeable to optical radiation and the other of said end faces being a mirror partially permeable to optical radiation.
Claim 2
Dependent Claim
97 words
A laser diode for producing focused light, comprising a semiconductor crystal having a planar PN junction and two parallel end faces extending perpendicular to the PN junction and conjointly forming a resonator for optical radiation, said end faces comprising portions of two confocal surfaces, said PN junction extending between said two confocal surfaces in a radial plane relative to the focal locus, the one of said end faces at the greater radial distance from the focal locus being impermeable to optical radiation and the other of said end faces being a mirror partially permeable to optical radiation.
Claim 3
Dependent Claim
33 words
A laser diode as claimed in claim 1, wherein each of said confocal surface portions is of spherical configuration and the plane of said PN junction extends through the center of the sphere.
Claim 4
Dependent Claim
34 words
A laser diode as claimed in claim 1, wherein each of said confocal surface portions is of cylindrical configuration and the plane of said PN junction extends perpendicularly to the axis of the cylinder.
Claim 5
Dependent Claim
51 words
A laser diode as claimed in claim 1, wherein said semiconductor crystal has two contact faces on opposite sides of said crystal extending parallel to the plane of said PN junction, aNd further comprising electrical contact and heat sink structures in conductive contact with the contact faces of said semiconductor crystal.
Claim 6
Dependent Claim
65 words
A laser diode as claimed in claim 1, wherein said semiconductor crystal has two contact faces on opposite sides of said crystal extending parallel to the plane of said PN junction, and further comprising a pair of electrical contact blocks of good heat conducting material, each of said blocks being in conductive contact with a corresponding one of the contact faces of said semiconductor crystal.
Claim 7
Dependent Claim
32 words
A laser diode as claimed in claim 1, wherein said semiconductor crystal has a dimension perpendicular to said PN junction which does not substantially exceed the luminescent region of said semiconductor crystal.
Claim 8
Dependent Claim
65 words
A laser diode as claimed in claim 1, wherein said semiconductor crystal has two contact faces on opposite sides of said crystal extending parallel to the plane of said PN junction, and further comprising a pair of light-responsive sensors, each of said sensors being affixed to a corresponding one of said sides and extending away from said semiconductor crystal substantially perpendicularly to the corresponding side.
Claim 9
Dependent Claim
37 words
A laser diode as claimed in claim 7, wherein each of said light-responsive sensors is of area type and has a length which is greater than the greatest distance between the contact faces of said semiconductor crystal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |