GB793045A - Improvements in or relating to dichroic mirrors - Google Patents

Improvements in or relating to dichroic mirrors

Info

Publication number
GB793045A
GB793045A GB3175154A GB3175154A GB793045A GB 793045 A GB793045 A GB 793045A GB 3175154 A GB3175154 A GB 3175154A GB 3175154 A GB3175154 A GB 3175154A GB 793045 A GB793045 A GB 793045A
Authority
GB
United Kingdom
Prior art keywords
layers
refractive index
thickness
optical thickness
alternately
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
GB3175154A
Inventor
William Spencer Percival
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB3175154A priority Critical patent/GB793045A/en
Publication of GB793045A publication Critical patent/GB793045A/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

Abstract

793,045. Optical systems. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Oct. 21, 1955 [Nov. 3, 1954], No. 31751/54. Class 97(1) In a dichroic mirror comprising a plurality of substantially transparent layers alternately of high and low refractive index and each having an optical thickness giving a one ,quarter wavelength phase delay at a frequency of light to be reflected by the mirror and alternate layers having the same refractive index, one or each of the first or last layers has therein a substantially transparent layer of optical thickness half that of the other layers of refractive index different from that of the external medium adjacent thereto and equal to the refraction index of the penultimate arc of the first mentioned layers. As shown layers 2-6 of quarter-wavelength thickness are alternately of magnesium fluoride and inc zinc sulphide while further layers 7, 8 of zinc sulphide of half the optical thickness of the layers 2-6 are deposited respectively on the glass support and on the layers 6. An additional layer 10 of quarter wavelength thickness and a refraction index the geometric mean between the effective refractive index of the filter and that of the external medium may be provided and a further glass plate 9 attached thereto. The magnesium fluoride may be replaced by arsenous oxide or barium chloride.
GB3175154A 1954-11-03 1954-11-03 Improvements in or relating to dichroic mirrors Expired GB793045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3175154A GB793045A (en) 1954-11-03 1954-11-03 Improvements in or relating to dichroic mirrors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3175154A GB793045A (en) 1954-11-03 1954-11-03 Improvements in or relating to dichroic mirrors

Publications (1)

Publication Number Publication Date
GB793045A true GB793045A (en) 1958-04-09

Family

ID=10327845

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3175154A Expired GB793045A (en) 1954-11-03 1954-11-03 Improvements in or relating to dichroic mirrors

Country Status (1)

Country Link
GB (1) GB793045A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279317A (en) * 1961-06-30 1966-10-18 Zeiss Ikon Ag Optical filter device with two series of interference layers for transmitting visible light and reflecting heat radiation
US4145113A (en) * 1977-08-05 1979-03-20 C. Reichert Optische Werke, Ag Color correcting interference filter
EP0144856A2 (en) * 1983-04-01 1985-06-19 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279317A (en) * 1961-06-30 1966-10-18 Zeiss Ikon Ag Optical filter device with two series of interference layers for transmitting visible light and reflecting heat radiation
US4145113A (en) * 1977-08-05 1979-03-20 C. Reichert Optische Werke, Ag Color correcting interference filter
EP0144856A2 (en) * 1983-04-01 1985-06-19 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus
EP0144856A3 (en) * 1983-04-01 1985-07-17 Fuji Photo Film Co., Ltd. Radiation image read-out apparatus

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