GB1022722A - Semiconductor laser operated coincidence device - Google Patents

Semiconductor laser operated coincidence device

Info

Publication number
GB1022722A
GB1022722A GB2862463A GB2862463A GB1022722A GB 1022722 A GB1022722 A GB 1022722A GB 2862463 A GB2862463 A GB 2862463A GB 2862463 A GB2862463 A GB 2862463A GB 1022722 A GB1022722 A GB 1022722A
Authority
GB
United Kingdom
Prior art keywords
laser
gate
current
inputs
semiconductor laser
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
GB2862463A
Inventor
Arthur Edward Brewster
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 GB2862463A priority Critical patent/GB1022722A/en
Priority to DEST22412A priority patent/DE1197505B/en
Publication of GB1022722A publication Critical patent/GB1022722A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F3/00—Optical logic elements; Optical bistable devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/14—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

1,022,722. Semi-conductor lasers. STANDARD TELEPHONES & CABLES Ltd. July 19, 1963, No. 28624/63. Heading H3B. A " coincident " condition is detected by a semi-conductor laser when a desired combination of electrical inputs is achieved. In Fig. 2, the threshold current of a laser 10 is exceeded when the bias current from a source 11 is augmented by current from either or both, as the case may be, of inputs 12, 13, to provide an OR-gate, or an AND-gate. Alternatively, there may be no bias current, the laser being activated by the simultaneous appearance of six inputs. In Fig. 3, the resistance of the bias circuit is decreased, to bring the bias current from a source 15, or sources, above the laser threshold, upon illumination of either or both, as the case may be, of photo-conductive devices 16, 17. The illumination may be from other lasers. In Fig. 4 (not shown), the laser threshold is exceeded when a photo-electric device 18 is illuminated by either (OR-gate) or both (AND-gate) of two sources.
GB2862463A 1963-07-19 1963-07-19 Semiconductor laser operated coincidence device Expired GB1022722A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2862463A GB1022722A (en) 1963-07-19 1963-07-19 Semiconductor laser operated coincidence device
DEST22412A DE1197505B (en) 1963-07-19 1964-07-16 Circuit arrangement for performing logical functions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2862463A GB1022722A (en) 1963-07-19 1963-07-19 Semiconductor laser operated coincidence device

Publications (1)

Publication Number Publication Date
GB1022722A true GB1022722A (en) 1966-03-16

Family

ID=10278541

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2862463A Expired GB1022722A (en) 1963-07-19 1963-07-19 Semiconductor laser operated coincidence device

Country Status (2)

Country Link
DE (1) DE1197505B (en)
GB (1) GB1022722A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079615A1 (en) * 1981-11-18 1983-05-25 Matsushita Electric Industrial Co., Ltd. Apparatus for laser light medical treatment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079615A1 (en) * 1981-11-18 1983-05-25 Matsushita Electric Industrial Co., Ltd. Apparatus for laser light medical treatment

Also Published As

Publication number Publication date
DE1197505B (en) 1965-07-29

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