Diffraction optical device and optical apparatus using the same
US6574035B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Dec 12, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/33
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An acoustooptic device is structured by providing an interdigital transducer in which arch-shaped electrode fingers are interdigitated so that the interdigital transducer is circular or annular in shape as a whole, on an optical waveguide which is circular when viewed from the front. This acoustooptic device is used as a diffraction optical device on which light is incident from the front. When an alternating voltage of a predetermined frequency is applied to the interdigital transducer by an oscillator, a concentric acoustic compressional wave is generated on the optical waveguide. The concentric acoustic compressional wave diffracts the incident light, so that the diffraction optical device functions like a lens and converges the luminous flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.