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US4324475A Expired / Lapsed US ⏱️ 0.0 years remaining

Laser component

Assignee: LIVING TECHNOLOGY GROUP Ltd A BRITISH Co
•
Filing: 1980-04-29
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Granted: 1982-04-13
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Expires: 2000-04-29
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Abstract

Abstract An etalon for use in lasers, particularly CW dye lasers, comprises a pair of plates, 10,11 respectively mounted at the ends of a tube 12 with the distal faces 10a, 11a of the plates parallel and the chamber 13 formed within the tube 12 between plates 10,11 is substantially completely filled with a fluid 20 whose refractive index matches that of the plates 10,11 and means 25 are provided for causing extension and contraction of the axial spacing of the plates 10,11. In one embodiment the tube 12 is made of piezoelectric material and the means 25 provides an electrical drive signal to the piezoelectric material. In another embodiment the tube 12 has piezoelectric portions and other portions made of a rigid material. In a further embodiment the tube has portions made of a rigid material which are separated by an elastomer 39 and the means 25 includes a pump 26 which is in fluid communication with the chamber 13. The plates 10 and 11 may be mounted directly on the ends of the tube 12 but more conveniently are mounted on adjustable holders 16, 16a, 17 and 17a.

Inventors

  • 👤 Anthony F. Purdie

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 12:22
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/1062; G; G02; G02F; G02F1/00; G02F1/01; G02F1/21; G02F1/213

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 66 words
An etalon for use in a laser comprising a pair of plates respectively mounted at the ends of a tube with the distal faces of the plates parallel, the chamber formed within the tube between the plates being substantially completely filled with a fluid whose refractive index matches that of the plates, and means for causing extension and contraction of the axial spacing of the plates.
Claim 2
Dependent Claim 66 words
An etalon for use in a laser comprising a pair of plates respectively mounted at the ends of a tube with the distal faces of the plates parallel, the chamber formed within the tube between the plates being substantially completely filled with a fluid whose refractive index matches that of the plates, and means for causing extension and contraction of the axial spacing of the plates.
Claim 3
Dependent Claim 29 words
An etalon as claimed in claim 1, wherein the plates are slightly wedged, the wedged faces being proximal and having a wedge angle which is less than 5 degrees.
Claim 4
Dependent Claim 27 words
An etalon as claimed in claim 1, wherein the distal faces of the etalon plates are optically polished and the proximal faces are free from anti-reflective coatings.
Claim 5
Dependent Claim 47 words
An etalon as claimed in claim 1, wherein the tube is made of piezoelectric material and the chamber is sealed, and the means for causing extension and contraction of the axial spacing of the plates provides an electrical dither signal which is applied to the piezoelectric tube.
Claim 6
Dependent Claim 42 words
An etalon as claimed in claim 4, wherein the liquid is noncompressible and the chamber contains the liquid and a very small air space to permit extension and contraction of the etalon to occur whilst retaining the index-matching effect of the liquid.
Claim 7
Dependent Claim 19 words
An etalon as claimed in claim 4, wherein the liquid is compressible and the chamber is free of air.
Claim 8
Dependent Claim 55 words
An etalon as claimed in claim 1, wherein the tube is made partly of an inelastic material and partly of an elastomeric material, the means for causing extension and contraction of the axial spacing of the plates being a pump in liquid-tight communication with the chamber and to which a dither signal may be applied.
Claim 9
Dependent Claim 38 words
An etalon as claimed in claim 1, wherein the plates are indirectly mounted at the end of the tube by means of adjustable holders whereby precise optical alignment of the distal faces of the plates can be effected.
Claim 10
Dependent Claim 20 words
A CW dye laser incorporating an etalon as claimed in claim 1 aligned with the optical axis of the laser.

References Cited (Backward Citations)

US3725814A Cited
US4152674A Cited
US4081765A Cited
US4081760A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-04-12 1985-10-12 1986-04-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-04-12 1989-10-12 1990-04-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-04-12 1993-10-12 1994-04-13 $7700.00 Window Closed / Lapsed

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