US3875532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser device having a light focusing transmission
Assignee: Nippon Selfoc Co Ltd
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Filing: 1973-12-26
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Granted: 1975-04-01
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Expires: 1993-12-26
Abstract
Abstract A semiconductor laser device includes a laser element and a light transmission body mounted in an integrated structure. The light transmission body is mounted coaxially with the axis of the active region of the laser element and includes a focusing portion arranged about the axis of the body. The refractive index distribution in the focusing portion of the light transmission body is chosen so as to minimize undesired oscillation modes in the output light beam and to provide an output beam of substantially circular cross section.
Inventors
- 👤 Kohroh Kobayashi
- 👤 Atsufumi Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:55
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/024; H01S5/022; H01S5/0225; H01S5/02253; H01S5/026; H01S5/005; H01S5/02208; H01S5/0235; H01S5/02355; H01S5/02365; H01S5/0237; H01S5/10; H01S5/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
198 words
A laser device for generating a light beam of predetermined cross section along a given path including: a semiconductor element having a first and a second opposed end surfaces, said element including a longitudinally extending laser active region extending between said end surfaces, the cross section of said region being elongated in a first direction, and said region having a substantially central axis; first reflecting means disposed on said first end surface of said element in the path of said beam; a light transmission body having an axis which is collinear with said axis of said laser active region, said transmission body having an inner and an outer opposed surfaces, said inner surface of said body being arranged closer to said laser element than said outer surface of said body; said light transmission body including a light focusing portion arranged along said axis of said transmission body, said focusing portion having a refractive index which decreases substantially proportionally to the square of the distance from said axis of said body at least in a direction substantially perpendicular to the direction of elongation of said laser region; and second reflecting means disposed on said outer surface of said body.
Claim 2
Dependent Claim
198 words
A laser device for generating a light beam of predetermined cross section along a given path including: a semiconductor element having a first and a second opposed end surfaces, said element including a longitudinally extending laser active region extending between said end surfaces, the cross section of said region being elongated in a first direction, and said region having a substantially central axis; first reflecting means disposed on said first end surface of said element in the path of said beam; a light transmission body having an axis which is collinear with said axis of said laser active region, said transmission body having an inner and an outer opposed surfaces, said inner surface of said body being arranged closer to said laser element than said outer surface of said body; said light transmission body including a light focusing portion arranged along said axis of said transmission body, said focusing portion having a refractive index which decreases substantially proportionally to the square of the distance from said axis of said body at least in a direction substantially perpendicular to the direction of elongation of said laser region; and second reflecting means disposed on said outer surface of said body.
Claim 3
Dependent Claim
25 words
A laser device as claimed in claim 1, including mounting means to hold said light transmission body and said laser element in an integrated structure.
Claim 4
Dependent Claim
25 words
A laser device as claimed in claim 2, wherein said mounting means includes an electrode structure for supplying excitation current to said semiconductor laser element.
Claim 5
Dependent Claim
33 words
A laser device as claimed in claim 3, wherein said mounting means includes a cylindrical outer wall which is coaxial with said laser region and with said axis of said light transmission body.
Claim 6
Dependent Claim
30 words
A laser device as claimed in claim 3, wherein said mounting means includes a rectangular outer wall which is substantially coaxial with said active region and said light transmission body.
Claim 7
Dependent Claim
20 words
A laser device as claimed in claim 1, wherein said light focusing portion is coextensive with said light transmission body.
Claim 8
Dependent Claim
27 words
A laser device as claimed in claim 1, wherein said light focusing portion is disposed in a part of said transmission body nearest to said laser element.
Claim 9
Dependent Claim
28 words
A laser device as claimed in claim 1, wherein said light focusing portion is disposed in said light transmission body in an area spaced from said laser element.
Claim 10
Dependent Claim
18 words
A laser device as claimed in claim 1, wherein said light transmission body is of circular cross section.
Claim 11
Dependent Claim
18 words
A laser device as claimed in claim 1, wherein said light transmission body is of rectangular cross section.
Claim 12
Dependent Claim
19 words
A laser device as claimed in claim 1, wherein said outer surface of said light transmission body is cylindrical.
Claim 13
Dependent Claim
19 words
A laser device as claimed in claim 1, wherein said outer surface of said light transmission body is spherical.
Claim 14
Dependent Claim
29 words
A laser device as claimed in claim 1, wherein said second reflecting means includes a layer of light reflecting material disposed on the outer surface of said transmission body.
Claim 15
Dependent Claim
49 words
A laser device as claimed in claim 1, wherein said seCond reflecting means includes a strip like layer of reflecting material disposed on said outer surface of said transmission body along an axis which is substantially perpendicular to the direction of elongation of said active region of said element.
Claim 16
Dependent Claim
41 words
A laser device as claimed in claim 1, in which the refractive index distribution within said focusing portion varies parabolically along any plane passing through the axis of said portion with a maximum value at the axis of the focusing portion.
Claim 17
Dependent Claim
71 words
A laser device as claimed in claim 1, in which the refractive index distribution within said focusing portion varies parabolically in a plane perpendicular to the direction of elongation of said active region of said element with a maximum value at the axis of said focusing portion and said refractive index is a constant value in a plane parallel to the direction of elongation of said active region of said element.
Claim 18
Dependent Claim
32 words
A laser device as claimed in claim 1, in which said focusing portion includes at least two sections and in which the refractive index distribution is different in each of said sections.
Claim 19
Dependent Claim
194 words
A laser device for generating a light beam of predetermined cross section along a given path has a first and a second opposed end surfaces which are substantially perpendicular to and arranged so that they intersect said given path, including: reflecting means disposed on each of said end surfaces within said path to reflect said light beam; a semiconductor element, said element including a longitudinally extending laser active region oriented to generate said beam along said path, the cross section of said region being elongated in a direction substantially transverse to the direction of said path and said region having a substantially central axis; a light transmission structure including at least two bodies having axes which are collinear with said axis of said laser active region, one of said bodies being disposed adjacent to each end of said laser active region; each of said light transmission bodies including a focusing portion arranged along the axis of said body, and each of said focusing portions having a refractive index distribution in which said refractive index is a maximum along said axis of said body and decreases parabolically in at least one plane intersecting said axis.
Claim 20
Dependent Claim
194 words
A laser device for generating a light beam of predetermined cross section along a given path has a first and a second opposed end surfaces which are substantially perpendicular to and arranged so that they intersect said given path, including: reflecting means disposed on each of said end surfaces within said path to reflect said light beam; a semiconductor element, said element including a longitudinally extending laser active region oriented to generate said beam along said path, the cross section of said region being elongated in a direction substantially transverse to the direction of said path and said region having a substantially central axis; a light transmission structure including at least two bodies having axes which are collinear with said axis of said laser active region, one of said bodies being disposed adjacent to each end of said laser active region; each of said light transmission bodies including a focusing portion arranged along the axis of said body, and each of said focusing portions having a refractive index distribution in which said refractive index is a maximum along said axis of said body and decreases parabolically in at least one plane intersecting said axis.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |