EP0075435A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electro-optic cells
Assignee: J K LASERS Ltd
•
Filing: 1982-09-15
•
Granted: —
•
Expires: 2002-09-15
Abstract
Abstract A Pockels cell (10) comprises an electro-optic crystal having front (12) and rear optical faces cut at the Brewster angle to the longitudinal axis of the cell. The cell is surrounded by dielectric material (13) and a pair of longitudinally spaced apart and longitudinally extending electrodes (15, 16) are formed on the dielectric material. Each electrode extends to the edge of its respective optical face. When used for Q-switching in a laser system, the orientation of the faces minimise Fresnel reflection losses while the electrode configuration ensures that a high extinction ratio may be obtained.
Inventors
- 👤 James Kenneth Dr. Wright
- 👤 Clive Lionel Michael Dr. Ireland
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0305
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
An electro-optic cell (10;100) comprising an electro-optic crystal having a longitudinal optical axis, an optical front face (12), an optical rear face, and a pair of electrodes (15,16; 105,107) for applying an electric field to the crystal, characterised in that each optical face (12) intersects the longitudinal axis at an angle which is in region of the Brewster angle for the material of the electro-optic crystal and the electrodes (15,16; 105,107) are arranged so that a beam of plane polarised light may be rotated through 900 with high uniformity of transmission across the effective aperture of the cell upon passing twice through the cell.
Claim 2
Dependent Claim
104 words
An electro-optic cell (10;100) comprising an electro-optic crystal having a longitudinal optical axis, an optical front face (12), an optical rear face, and a pair of electrodes (15,16; 105,107) for applying an electric field to the crystal, characterised in that each optical face (12) intersects the longitudinal axis at an angle which is in region of the Brewster angle for the material of the electro-optic crystal and the electrodes (15,16; 105,107) are arranged so that a beam of plane polarised light may be rotated through 900 with high uniformity of transmission across the effective aperture of the cell upon passing twice through the cell.
Claim 3
Dependent Claim
41 words
An electro-optic cell as claimed in Claim 1 characterised in that the electrodes (15,16; 105,107) are mounted at positions which are longitudinally spaced apart, each electrode surrounds the longitudinal axis of the cell, and each electrode extends longitudinally along the cell.
Claim 4
Dependent Claim
28 words
An electro-optic cell as claimed in Claim 2 characterised in that each electrode (15,16; 105, 107) extends at least to the edge of its associated optical face (12).
Claim 5
Dependent Claim
35 words
An electro-optic cell as claimed in any one of the preceding claims characterised in that a layer of dielectric material (13; 102) extends at least between each electrode (15, 16; 105, 107) and the crystal.
Claim 6
Dependent Claim
26 words
An electro-optic cell as claimed in Claim 4 characterised in that the layer of dielectric material (13; 102) also extends across the space separating the electrodes.
Claim 7
Dependent Claim
43 words
An electro-optic cell as claimed in Claim 5 characterized in that one electrode (105) is mounted between an inner (102) and outer (106) layer of dielectric material, at least the outer layer (106) also extending between the other electrode (107) and the crystal.
Claim 8
Dependent Claim
63 words
An electro-optic cell as claimed in any one of the preceding claims characterised in that the angle between the longitudinal axis and each optical face is selected so that, when a light beam incident on one of the faces is polarised so that its electric field vector lies in the plane of incidence, the reflection loss at that face is less than 0:5%.
Claim 9
Dependent Claim
26 words
An electro-optic cell as claimed in Claim 7 characterised in that the angle between the longitudinal axis and each optical face is equal to Brewster angle.
Claim 10
Dependent Claim
98 words
An electro-optic cell (10; 100) comprising an electro-optic crystal having a longitudinal optical axis, an optical front face (12), an optical rear face, and a pair of electrodes (15,16; 105,107) for applying an electric field to the crystal, characterised in that each optical face (12) intersects the longitudinal axis at an angle which is in the region of the Brewster angle for the material of the electro-optic crystal, the electrodes (15,16; 105,107) are mounted at positions which are longitudinally spaced apart, each electrode surrounds the longitudinal axis of the cell, and each electrode extends longitudinally along the cell.
Claim 11
Dependent Claim
98 words
An electro-optic cell (10; 100) comprising an electro-optic crystal having a longitudinal optical axis, an optical front face (12), an optical rear face, and a pair of electrodes (15,16; 105,107) for applying an electric field to the crystal, characterised in that each optical face (12) intersects the longitudinal axis at an angle which is in the region of the Brewster angle for the material of the electro-optic crystal, the electrodes (15,16; 105,107) are mounted at positions which are longitudinally spaced apart, each electrode surrounds the longitudinal axis of the cell, and each electrode extends longitudinally along the cell.
Claim 12
Dependent Claim
44 words
An electro-optic cell (10;100) comprising an electro-optic crystal and a pair of electrodes (15,16; 105,107) mounted on the crystal for applying an electric field thereto, characterised in that a layer of dielectric material (13, 102) extends at least between each electrode and the crystal.
Claim 13
Dependent Claim
44 words
An electro-optic cell (10;100) comprising an electro-optic crystal and a pair of electrodes (15,16; 105,107) mounted on the crystal for applying an electric field thereto, characterised in that a layer of dielectric material (13, 102) extends at least between each electrode and the crystal.
Claim 14
Dependent Claim
25 words
An electro-optic cell as claimed in Claim 10 characterised in that the layer of dielectric material (13;102) also extends across the space separating the electrodes.
Claim 15
Dependent Claim
43 words
An electro-optic cell as claimed in Claim 11 characterised in that one electrode (105) is mounted between an inner (102) and an outer (106) layer of dielectric material, at least the outer layer (106) also extending betweenthe other electrode (107) and the crystal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.