EP0271809A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Laser apparatus
Assignee: OFFERTA DI LICENZA AL PUBBLICO
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Filing: 1987-12-08
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Granted: —
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Expires: 2007-12-08
Abstract
Abstract An output laser beam (8) of an unstable laser resonator has a circular cross sectional pattern, so that a condensation thereof becomes easy, resulting in a high power beam. The circular pattern is obtained by making an expanding mirror of the resonator partially transmissible and compensating for a phase difference between laser beam portions passing through the expanding mirror and other portion of a window mirror (4).
Inventors
- 👤 Koji Mitsubishi Denki K.K. Yasui
- 👤 Masaaki Mitsubishi Denki K.K. Tanaka
- 👤 Shigenori Mitsubishi Denki K.K. Yagi
- 👤 Masaki Mitsubishi Denki K.K. Kuzumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:37
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08059; H01S3/08068; H01S3/02; H01S3/03; H01S3/034; H01S3/08081
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
97 words
A laser apparatus comprising an unstable resonator composed of an expanding mirror formed on a convex or concave window mirror (4) and having a partial transmittivity and a collimating mirror (1) disposed in facing relation to said expanding mirror for reflecting laser beam reflected and enlarged by said expanding mirror to said expanding mirror and to an annular area of said window mirror (4) surrounding said expanding mirror and means for deriving portions of said laser beam through said expanding mirror and said annular area while cancelling out phase difference between said portions of said laser beam.
Claim 2
Dependent Claim
97 words
A laser apparatus comprising an unstable resonator composed of an expanding mirror formed on a convex or concave window mirror (4) and having a partial transmittivity and a collimating mirror (1) disposed in facing relation to said expanding mirror for reflecting laser beam reflected and enlarged by said expanding mirror to said expanding mirror and to an annular area of said window mirror (4) surrounding said expanding mirror and means for deriving portions of said laser beam through said expanding mirror and said annular area while cancelling out phase difference between said portions of said laser beam.
Claim 3
Dependent Claim
26 words
The laser apparatus as claimed in claim 1, wherein said expanding mirror is formed on a center portion of said convex or concave window mirror (4).
Claim 4
Dependent Claim
35 words
The laser apparatus as claimed in claim 2, wherein said expanding mirror is formed by forming on said center portion of said convex or concave mirror (4) a reflection membrane (20) having a partial reflectivity.
Claim 5
Dependent Claim
95 words
A laser apparatus comprising an unstable resonator composed of an expanding mirror formed on of a convex or concave window mirror (4)and having a partial transmittivity and a collimating mirror (1) disposed in facing relation to said expanding mirror for reflecting laser beam reflected and enlarged by said expanding mirror to said expanding mirror and to an annular area of said window mirror (4) surrounding said expanding mirror, said expanding mirror being formed by forming on an inner center portion of said window mirror (4)having both surfaces coated with non-reflection membrane a partial reflection membrane.
Claim 6
Dependent Claim
95 words
A laser apparatus comprising an unstable resonator composed of an expanding mirror formed on of a convex or concave window mirror (4)and having a partial transmittivity and a collimating mirror (1) disposed in facing relation to said expanding mirror for reflecting laser beam reflected and enlarged by said expanding mirror to said expanding mirror and to an annular area of said window mirror (4) surrounding said expanding mirror, said expanding mirror being formed by forming on an inner center portion of said window mirror (4)having both surfaces coated with non-reflection membrane a partial reflection membrane.
Claim 7
Dependent Claim
24 words
The laser apparatus as claimed in claim 4, wherein said expanding mirror is formed on a center of said convex or concave window mirror(4).
Claim 8
Dependent Claim
38 words
The laser apparatus as claimed in claim 5, further comprising means for deriving portions of said laser beam through said expanding mirror and said annular area while cancelling out phase difference between said portions of said laser beam.
Claim 9
Dependent Claim
95 words
A laser apparatus comprising an unstable resonator composed of an expanding mirror formed on a convex or concave window mirror (4) and having a partial transmittivity and a collimating mirror (1)disposed in facing relation to said expanding mirror for reflecting laser beam reflected and enlarged by said expanding mirror to said expanding mirror and to an annular area of said window mirror (4) surrounding said expanding mirror, said expanding mirror being formed by removing a non-reflection membrane on an inner center portion of said window mirror (4) having both surfaces coated with said non-reflection membrane.
Claim 10
Dependent Claim
95 words
A laser apparatus comprising an unstable resonator composed of an expanding mirror formed on a convex or concave window mirror (4) and having a partial transmittivity and a collimating mirror (1)disposed in facing relation to said expanding mirror for reflecting laser beam reflected and enlarged by said expanding mirror to said expanding mirror and to an annular area of said window mirror (4) surrounding said expanding mirror, said expanding mirror being formed by removing a non-reflection membrane on an inner center portion of said window mirror (4) having both surfaces coated with said non-reflection membrane.
Claim 11
Dependent Claim
25 words
The laser apparatus as claimed in claim 7, wherein said expanding mirror is formed on a center portion of said convex or concave window mirror.
Claim 12
Dependent Claim
38 words
The laser apparatus as claimed in claim 8, further comprising means for deriving portions of said laser beam through said expanding mirror and said annular area while cancelling out phase difference between said portions of said laser beam.
Claim 13
Dependent Claim
25 words
The laser apparatus as claimed in any of claims 1 to 9, wherein radii of curvature of opposite surfaces of said expanding mirror is common.
Claim 14
Dependent Claim
27 words
The laser apparatus as claimed in any of claims 1 to 9, wherein said partial transmittivity of of said expanding mirror is constant throughout the surface thereof.
Claim 15
Dependent Claim
23 words
The laser apparatus as claimed in any of claims 3 to 6, wherein said partial reflection membrane is composed of a single layer.
Claim 16
Dependent Claim
26 words
The laser apparatus as claimed in claim 12, wherein said partial reflection membrane of the same material as that of a substrate of said expanding mirror.
Claim 17
Dependent Claim
42 words
The laser apparatus as claimed in any of claims 1 to 13, wherein a reflection membrane (10) having the same diameter as said expanding mirror and faced to said expanding mirror is provided on a center portion of said collimating mirror (1).
Claim 18
Dependent Claim
44 words
The laser apparatus as claimed in any of claims 1 to 13, wherein said collimating mirror (1) is coated with a reflection membrane (10) except a center portion thereof, said reflection membrane (10) having the same diameter as said expanding mirror and faced thereto.
Claim 19
Dependent Claim
54 words
The laser apparatus as claimed in claim 14 or 15, wherein thickness d of said reflection membrane (10) is determined by where λ is wavelength of laser beam and ϑ is phase difference between said portions of said laser beam passing through said expanding mirror and said annular area of said window mirror (4).
Claim 20
Dependent Claim
39 words
The laser apparatus as claimed in any of claims 1 to 13, wherein a center portion of said collimating mirror(1) facing to said expanding mirror is stepped, said stepped portion (11) having the same diameter as said expanding mirror.
Claim 21
Dependent Claim
24 words
The laser apparatus as claimed in any of claims 1 to 13, wherein said expanding mirror is stepped with respect to said annular area.
Claim 22
Dependent Claim
21 words
The laser apparatus as claimed in any of claims 1 to 13, wherein said means comprises a phase compensation mirror (400).
Claim 23
Dependent Claim
63 words
The laser apparatus as claimed in claim 19, wherein said phase compensation mirror (400) has a first portion through which said laser beam portion corresponding to said annular area passes and a second portion through which said laser beam portion corresponding to said expanding mirror passes, said first and second portions of said phase compensation mirror (400) having different constructions from each other.
Claim 24
Dependent Claim
38 words
The laser apparatus as claimed in claim 20, wherein a difference in construction between said first and second portion of said phase compensation mirror (400) is given by a step formed between said first and second portions thereof.
Claim 25
Dependent Claim
47 words
The laser apparatus as claimed in claim 20, wherein a difference in construction between said first and second portions of said phase compensation mirror (400) is given by a difference in construction between membranes formed on said first and second portions of said phase compensation mirror (400).
Claim 26
Dependent Claim
34 words
The laser apparatus as claimed in claim 21, wherein said phase compensation mirror (400) comprises a reflection mirror (500) and said step is given by forming a metal membrane on said reflection mirror (500).
Claim 27
Dependent Claim
30 words
The laser apparatus as claimed in any of claims 1 to 13, wherein said means comprises a difference in outer surface construction between said expanding mirror and said annular area.
Claim 28
Dependent Claim
23 words
The laser apparatus as claimed in claim 24, wherein said difference comprises a step formed between said expanding mirror and said annular area.
Claim 29
Dependent Claim
27 words
The laser apparatus as claimed in claim 24, wherein said difference comprises a difference in construction between membranes formed on said expanding mirror and said annular area.
Claim 30
Dependent Claim
31 words
The laser apparatus as claimed in any of claims 3 to 6, 12 to 16 , 22, 23 and 25, wherein said membrane is formed by the chemical vapor deposition method.
Claim 31
Dependent Claim
30 words
The laser apparatus as claimed in any of claims 3 to 6, 12 to 16, 22, 23 and 25, wherein said membrane is formed by the ionized cluster beam method.
References Cited (Backward Citations)
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