GB1523332A - Optical bandpass filter - Google Patents

Optical bandpass filter

Info

Publication number
GB1523332A
GB1523332A GB934975A GB934975A GB1523332A GB 1523332 A GB1523332 A GB 1523332A GB 934975 A GB934975 A GB 934975A GB 934975 A GB934975 A GB 934975A GB 1523332 A GB1523332 A GB 1523332A
Authority
GB
United Kingdom
Prior art keywords
optical thickness
cavity
bandpass filter
optical
annular spacers
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
GB934975A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB934975A priority Critical patent/GB1523332A/en
Publication of GB1523332A publication Critical patent/GB1523332A/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
    • G02B5/281—Interference filters designed for the infrared light
    • G02B5/282—Interference filters designed for the infrared light reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Filters (AREA)

Abstract

1523332 Interference filters STANDARD TELEPHONES & CABLES Ltd 26 Feb 1976 [6 March 1975] 9349/75 Heading G2J An interference filter comprises a stack of two or more transparent bodies having optical flat surfaces, each two being separated by annular spacers so as to define one or more cavities which contain a fluid of refractive index below that of said bodies, each said body having an optical thickness equal to an odd number of quarter wavelengths of the mean wavelength of the filter pass band and each cavity having an optical thickness equal to an integral number of half wavelengths of said beam wavelength. The annular spacers may be formed of Piezo-electric material so that the optical thickness of each cavity may be adjusted.
GB934975A 1976-02-26 1976-02-26 Optical bandpass filter Expired GB1523332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB934975A GB1523332A (en) 1976-02-26 1976-02-26 Optical bandpass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB934975A GB1523332A (en) 1976-02-26 1976-02-26 Optical bandpass filter

Publications (1)

Publication Number Publication Date
GB1523332A true GB1523332A (en) 1978-08-31

Family

ID=9870235

Family Applications (1)

Application Number Title Priority Date Filing Date
GB934975A Expired GB1523332A (en) 1976-02-26 1976-02-26 Optical bandpass filter

Country Status (1)

Country Link
GB (1) GB1523332A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460057A1 (en) * 1979-06-26 1981-01-16 Barr & Stroud Ltd COMPONENTS FOR LASERS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460057A1 (en) * 1979-06-26 1981-01-16 Barr & Stroud Ltd COMPONENTS FOR LASERS

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee