JPS54161348A - Short wavelength optical filter - Google Patents

Short wavelength optical filter

Info

Publication number
JPS54161348A
JPS54161348A JP7025878A JP7025878A JPS54161348A JP S54161348 A JPS54161348 A JP S54161348A JP 7025878 A JP7025878 A JP 7025878A JP 7025878 A JP7025878 A JP 7025878A JP S54161348 A JPS54161348 A JP S54161348A
Authority
JP
Japan
Prior art keywords
film
refractive index
waveguide
substrate
light
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.)
Granted
Application number
JP7025878A
Other languages
Japanese (ja)
Other versions
JPS5737843B2 (en
Inventor
Hiroshi Terui
Morio Kobayashi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP7025878A priority Critical patent/JPS54161348A/en
Publication of JPS54161348A publication Critical patent/JPS54161348A/en
Publication of JPS5737843B2 publication Critical patent/JPS5737843B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Integrated Circuits (AREA)
  • Optical Filters (AREA)

Abstract

PURPOSE:To produce a filter easily and inexpensively, while ensuring the high accuracy, by forming a preset portion having a preset low refractive index on a waveguide film which in turn is formed with a substrate. CONSTITUTION:A substrate 11 of Vycor glass, which has a refractive index of n1 for the wavelength lambda of a waveguide light 12, is formed with a waveguide film 2 of glass having a refractive index of n2. The substrate 11 is used as a first cladding layer, and air of a refractive index n3=1.000, which exist on the film 2, is used as a second cladding layer. At this time, the film thcikness W1 of the film 2 is made larger than the minimum film thickness Wm, as is expressed by formula I (wherein n2>n1>n3) so that the light 12 having a shorter wavelength than the wavelength lambda can propagate through the film 2. When a preset portion 3 of the film 2 is heated with a laser beam so that the reduction in the refractive index DELTAn has a relationship of (n2-DELTAn)>n1, only the waveguide light 13 having a shorter wavelength than that lambda2 (wherein lambda>lambda2), as is expressed by formula II can pass through the portion 3.
JP7025878A 1978-06-10 1978-06-10 Short wavelength optical filter Granted JPS54161348A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7025878A JPS54161348A (en) 1978-06-10 1978-06-10 Short wavelength optical filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7025878A JPS54161348A (en) 1978-06-10 1978-06-10 Short wavelength optical filter

Publications (2)

Publication Number Publication Date
JPS54161348A true JPS54161348A (en) 1979-12-20
JPS5737843B2 JPS5737843B2 (en) 1982-08-12

Family

ID=13426334

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7025878A Granted JPS54161348A (en) 1978-06-10 1978-06-10 Short wavelength optical filter

Country Status (1)

Country Link
JP (1) JPS54161348A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002341168A (en) * 2001-05-16 2002-11-27 Hoya Corp Optical waveguide element, method for manufacturing the same and method for forming distribution of refractive index

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996745A (en) * 1973-01-17 1974-09-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4996745A (en) * 1973-01-17 1974-09-12

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002341168A (en) * 2001-05-16 2002-11-27 Hoya Corp Optical waveguide element, method for manufacturing the same and method for forming distribution of refractive index

Also Published As

Publication number Publication date
JPS5737843B2 (en) 1982-08-12

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