Time gated imaging through scattering material using polarization and stimulated raman amplification
US5418797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1993 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Jan 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/067
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for imaging through scattering materials produces a broadband laser reference beam and a correlated Stokes illumination beam. The broadband reference beam has a preselected Raman pump wavelength and the Stokes illumination beam has a preselected Stokes wavelength. The Stokes illumination beam is transmitted into the scattering material to obtain a Stokes signal beam having a first image carrying component and a first nonimage component. A relative delay is produced between the reference beam and the Stokes signal beam. The delayed reference beam and the delayed Stokes signal beam are polarized. The polarized reference beam and the polarized Stokes signal beam are combined to produce a combined beam having a Stokes component and a reference component, the Stokes component having a second image carrying component and a second nonimage component, so that the second image carrying component and the reference component are mutually correlated, and so that the polarization state of the Stokes component differs from the polarization state of the reference component. A Stimulated Raman amplifier responsive to the combined beam produces an amplified signal beam having a third i…
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