GB758939A - Improvements in or relating to optical apparatus - Google Patents

Improvements in or relating to optical apparatus

Info

Publication number
GB758939A
GB758939A GB3354453A GB3354453A GB758939A GB 758939 A GB758939 A GB 758939A GB 3354453 A GB3354453 A GB 3354453A GB 3354453 A GB3354453 A GB 3354453A GB 758939 A GB758939 A GB 758939A
Authority
GB
United Kingdom
Prior art keywords
silica
lens
layer
radiation
relating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3354453A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3354453A priority Critical patent/GB758939A/en
Publication of GB758939A publication Critical patent/GB758939A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G02B5/285—Interference filters comprising deposited thin solid films

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

758,939. Optical systems. GENERAL ELECTRIC CO., Ltd., and GOLDSMID, H. J. Nov. 25, 1954 [Dec. 2, 1953], No. 33544/53. Class 97 (1). An optical element for use with infra-red radiation having a mean frequency corresponding to a wavelength A in vacuo, is of silicon and has on at least that part of its surface through which the radiation is to be transmitted, a layer of silica having a uniform thickness of approximately (2N-1) #/6, where N is a small integer, preferably unity. The element may be a lens produced by grinding a sheet of pure silicon cut from a directionally frozen ingot, the main faces of the slice lying in planes perpendicular to the direction of freezing. The silica layer may be formed by heating the lens in air at a temperature of 1000‹ C., any excess silver being removed by dilute hydrofluoric acid.
GB3354453A 1953-12-02 1953-12-02 Improvements in or relating to optical apparatus Expired GB758939A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3354453A GB758939A (en) 1953-12-02 1953-12-02 Improvements in or relating to optical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3354453A GB758939A (en) 1953-12-02 1953-12-02 Improvements in or relating to optical apparatus

Publications (1)

Publication Number Publication Date
GB758939A true GB758939A (en) 1956-10-10

Family

ID=10354323

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3354453A Expired GB758939A (en) 1953-12-02 1953-12-02 Improvements in or relating to optical apparatus

Country Status (1)

Country Link
GB (1) GB758939A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2242756A (en) * 1990-04-03 1991-10-09 Plessey Co Ltd Antireflection coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2242756A (en) * 1990-04-03 1991-10-09 Plessey Co Ltd Antireflection coating
GB2242756B (en) * 1990-04-03 1994-04-20 Plessey Co Ltd Antireflective coatings

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