US3790257A
Expired / Lapsed
US
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Conductively cooled catoptric lens arrangement
Assignee: Raytheon Co
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Filing: 1971-12-01
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Granted: 1974-02-05
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Expires: 1991-12-01
Abstract
Abstract A catoptric lens arrangement which is adapted to use with high power radiant energy, as from a laser, is shown. The entrance mirror of the contemplated lens arrangement has a convex reflective surface so that the radiative flux density at the entrance mirror is less than the radiative flux density in a laser beam. The various mirrors in the contemplated lens arrangement further are arranged so that each such mirror may be conductively cooled with aperture blockage reduced to a minimum or eliminated altogether.
Inventors
- 👤 I Goldstein
- 👤 W Rambauske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:46
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/10; G02B19/00; G02B19/0004; G02B19/0019; G02B19/0023; G02B19/0033; G02B19/0047; G02B19/0052; H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034; H01S3/05; H01S3/08; H01S3/08059; H01S3/04; H01S3/0401
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
276 words
In a conductively cooled catoptric lens arrangement for changing the cross-sectional area of a high power collimated beam of coherent radiant energy from a point source, as a laser, the improvement comprising: a. an entrance mirror centered on a longitudinal optic axis on which a high power entrance beam of radiant energy is obliquely incident, such mirror having a convex reflective surface formed as a surface of revolution generated by moving a segment of a first quadratic conic section about said longitudinal axis, at least one focal point of such section tracing a focal arc with a center at a point on said longitudinal axis and lying in a plane orthogonal to said longitudinal axis, said high power beam of radiant energy being directed radially outward from said longitudinal axis; b. a secondary mirror disposed to intercept the radiant energy reflected from said entrance mirror said secondary mirror having a concave reflecting surface formed as a surface of revolution generated by moving a segment of a second quadratic conic section about said longitudinal axis, a focal point of said second section tracing a focal arc coincident with the focal arc of said first quadratic conic section to form an emergent beam of radiant energy directed along said longitudinal axis, the cross-sectional area of said emergent beam differing from said cross-sectional area of the high power entrance beam; c. supporting means, disposed to fix the relative positions of the entrance mirror and the secondary mirror so that their focal arcs are coincident with each other; and d. means, coacting with at least the supporting means and the entrance mirror, for conductively cooling at least the entrance mirror.
Claim 2
Dependent Claim
276 words
In a conductively cooled catoptric lens arrangement for changing the cross-sectional area of a high power collimated beam of coherent radiant energy from a point source, as a laser, the improvement comprising: a. an entrance mirror centered on a longitudinal optic axis on which a high power entrance beam of radiant energy is obliquely incident, such mirror having a convex reflective surface formed as a surface of revolution generated by moving a segment of a first quadratic conic section about said longitudinal axis, at least one focal point of such section tracing a focal arc with a center at a point on said longitudinal axis and lying in a plane orthogonal to said longitudinal axis, said high power beam of radiant energy being directed radially outward from said longitudinal axis; b. a secondary mirror disposed to intercept the radiant energy reflected from said entrance mirror said secondary mirror having a concave reflecting surface formed as a surface of revolution generated by moving a segment of a second quadratic conic section about said longitudinal axis, a focal point of said second section tracing a focal arc coincident with the focal arc of said first quadratic conic section to form an emergent beam of radiant energy directed along said longitudinal axis, the cross-sectional area of said emergent beam differing from said cross-sectional area of the high power entrance beam; c. supporting means, disposed to fix the relative positions of the entrance mirror and the secondary mirror so that their focal arcs are coincident with each other; and d. means, coacting with at least the supporting means and the entrance mirror, for conductively cooling at least the entrance mirror.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |