Voltage-tunable optical filters for instrumentation applications
US9645291B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2016 |
| Grant date | May 9, 2017 |
| Priority date | — |
| Expiry date | Apr 18, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A series combination of a shortwave pass (SWP) filter and a longwave pass (LWP) filter is provided in an arrangement where the filters are separately and independently controlled by voltages applied to the respective filters. The applied voltages modify the response profile of the associated filters, where changes in the voltage applied to the SWP filter changes its cut-off wavelength λS and changes in the voltage applied to the LWP filter changes its cut-on wavelength λL (the bandwidth of the combined arrangement between the span between λL and λS). The ability to independently tune both the SWP and LWP filters allows for the combined result of their series combination to modify both the center wavelength (CWL) and bandwidth (BW) of the overall filter resulting from their combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.