Acoustic absorber having a roughened surface for AO devices
US9310631B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2014 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Oct 23, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/11
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An acousto-optic (AO) device includes an AO crystal having a plurality of faces including a first face and a second face. An input transducer bonded to the first face (top electrode) for receiving a radio frequency (RF) signal and launching bulk acoustic waves (BAWs) configured to interact with an optical beam propagating in the AO crystal, wherein the BAWs are received at least in part by the second face after interacting with the optical beam. The second face has a roughened surface portion over an area of at least (≧) 50% of an area of the top electrode, and a root mean square (rms) surface roughness≧1 μm and a surface profile derivable from a Fourier transform which provides at least one a first spatial frequency peak from 1 cycle/mm to 300 cycles/mm or at least one band of spatial frequency peaks from 1 cycle/mm to 300 cycles/mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.