Time gated imaging through scattering material using polarization and stimulated raman amplification
January 15, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3802777 Sub-picosecond optical gating by degenerate four-wave mixing Heterodyne detection of coherent Raman signals Photoacoustic rotational raman spectroscopy Crossed-beam phase-matched coherent anti-stokes raman spectroscopy Coherent anti-Stokes Raman device Picosecond broadband cars probe using the picosecond continuum Early detection of breast cancer using transillumination Time-gated imaging through dense-scattering materials using stimulated Raman amplification Apparatus for imaging an object in or through a scattering medium using coherent anti-Stokes Raman scattering Patent #: 5303710 InventorsApplicationNo. 003999 filed on 01/15/1993US Classes:372/3, RAMAN LASER356/301, With Raman type light scattering600/473, Infrared radiation600/476Visible light radiationExaminersPrimary: Bovernick, Rodney B.Assistant: McNutt, Robert Attorney, Agent or FirmForeign Patent References
International ClassesA61B 006/00G01J 003/44 AbstractAn 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 image carrying component with polarization state perpendicular to the polarization state of the Stokes component and having a third nonimage component with polarization state parallel to the polarization state of the Stokes component. The third image carrying component is separated from the rest of the amplified signal beam with the use of a polarizer and is later detected.Other References
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