GB1285782A - Improvements in and relating to optical systems - Google Patents
Improvements in and relating to optical systemsInfo
- Publication number
- GB1285782A GB1285782A GB592269A GB592269A GB1285782A GB 1285782 A GB1285782 A GB 1285782A GB 592269 A GB592269 A GB 592269A GB 592269 A GB592269 A GB 592269A GB 1285782 A GB1285782 A GB 1285782A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- ray
- refringent
- astigmatism
- rays
- 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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
1285782 Optical systems PLESSEY CO Ltd 2 Feb 1970 [4 Feb 1969] 5922/69 Heading G2J An optical system comprises a bi-refringent plate 2 to separate two mutually perpendicularly plane polarized light rays E, O, a rotator 4 to rotate each of their planes of polarization through substantially 90 degrees, and a bi-refringent plate 6 which is orientated so that any astigmatic effect produced by the plate 2 tends to be corrected by the plate 6. The E ray at plate 2 is deflected. vertically and two mutually perpendicular components thereof are thus subjected to different deflections so that the ray exhibits astigmatism. The O-ray, not being deflected, exhibits no astigmatism. The plate 6 is orientated at 90 degrees to plate 2 so that after passing through the rotator 4 (which may be a half-wave plate) and plate 6, each E ray component will have been subjected to the same total deflection thus any astigmatism is cancelled. In another embodiment, Fig. 2 (not shown), the path lengths of the E and O rays are equalized by auxiliary bi-refringent plates (26), (66) placed adjacent plates 2, 6 respectively to introduce deflections in the O ray only. In both embodiments the emerging E and O rays may be used in a split angle digital light deflector or in systems producing holograms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB592269A GB1285782A (en) | 1969-02-04 | 1969-02-04 | Improvements in and relating to optical systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB592269A GB1285782A (en) | 1969-02-04 | 1969-02-04 | Improvements in and relating to optical systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1285782A true GB1285782A (en) | 1972-08-16 |
Family
ID=9805154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB592269A Expired GB1285782A (en) | 1969-02-04 | 1969-02-04 | Improvements in and relating to optical systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1285782A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2256725A (en) * | 1991-06-10 | 1992-12-16 | Alps Electric Co Ltd | Light separation polarising element |
| US5936768A (en) * | 1995-09-20 | 1999-08-10 | Nec Corporation | Optical passive device for an optical fiber amplifier and the optical amplifier |
-
1969
- 1969-02-04 GB GB592269A patent/GB1285782A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2256725A (en) * | 1991-06-10 | 1992-12-16 | Alps Electric Co Ltd | Light separation polarising element |
| GB2256725B (en) * | 1991-06-10 | 1995-01-18 | Alps Electric Co Ltd | Polarising light separation element and light receiving optical device using same |
| US5936768A (en) * | 1995-09-20 | 1999-08-10 | Nec Corporation | Optical passive device for an optical fiber amplifier and the optical amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |