Method of and apparatus for making wavelength-resolved polarimetric measurements
US6856398B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 2002 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Aug 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M11/336
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for making wavelength-resolved polarimetric measurements comprises an interferometric source (10,12), for example a broadband source (10) and an optical interferometer unit (12), and a polarization generator unit (16) for generating different states of polarization of light received from the interferometric source and applying same to a device-under-test (30). A polarimeter unit (20) receives and polarimetrically-analyzes light from the device-under-test, converts the polarimetrically-analyzed light into electrical signals, and, using Fast Fourier Transform numerical analysis, computes therefrom the wavelength-resolved polarimetric measurements. Placing the optical interferometer unit (10,12) “upstream” not only of the device-under-test (30), but also of the polarisation generator unit (16), means that the latter substantially eliminates polarization dependent effects introduced by the former. The polarimeter (20) can still perform the necessary transformation even though the interferogram has been passed through the polarisation generator unit and the device-under-test.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.