GB1179349A - Improvements in or relating to Optical Systems - Google Patents
Improvements in or relating to Optical SystemsInfo
- Publication number
- GB1179349A GB1179349A GB4177967A GB4177967A GB1179349A GB 1179349 A GB1179349 A GB 1179349A GB 4177967 A GB4177967 A GB 4177967A GB 4177967 A GB4177967 A GB 4177967A GB 1179349 A GB1179349 A GB 1179349A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waveguide
- beams
- mode
- refractive index
- supports
- 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
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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/002—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light using optical mixing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
1,179,349. Optical apparatus. AMERICAN OPTICAL CORP. Sept. 13, 1967, No. 41779/67. Heading G2J. [Also in Division G1]. In an optical heterodyne system the wavefronts of the interfering beams are made accurately parallel by passing the beams through a waveguide which supports only one mode or a plurality of modes one of which may be subsequently selected. Beams from HeNe gas lasers 11, 12 operating at slightly different frequencies near the 6300Š line are directed by a beam splitter 15 and a reversed microscope objective 20 on to a waveguide 19. The waveguide comprises a 2 micron diameter filament 21 of refractive index 1À54 surrounded by cladding 22 of refractive index 1À52. The guide is surrounded by black glass of refractive index greater than 1À52. The waveguide supports and aligns the HE11 of the two beams and the light leaving the waveguide falls on a photo-multiplier feeding the circuit tuned to the difference frequency of the beams. The waveguide may be of parallel layers instead of concentric cylinders, in which case mode selection takes place in only on direction. If the waveguide supports more than one mode, one mode may be selected by relying on the fact that different modes leave the waveguide at different angles to the axis. The beams need not be coherent one need not even be monochromatic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4177967A GB1179349A (en) | 1967-09-13 | 1967-09-13 | Improvements in or relating to Optical Systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4177967A GB1179349A (en) | 1967-09-13 | 1967-09-13 | Improvements in or relating to Optical Systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1179349A true GB1179349A (en) | 1970-01-28 |
Family
ID=10421335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4177967A Expired GB1179349A (en) | 1967-09-13 | 1967-09-13 | Improvements in or relating to Optical Systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1179349A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2228344A (en) * | 1989-02-17 | 1990-08-22 | Mezhotraslevoi Nt Komplex Mikr | Ophthalmological lasers |
-
1967
- 1967-09-13 GB GB4177967A patent/GB1179349A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2228344A (en) * | 1989-02-17 | 1990-08-22 | Mezhotraslevoi Nt Komplex Mikr | Ophthalmological lasers |
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