Patent ID: 9134242
Filing Date: 2015-09-15
Classification: G01B,G01N,G02B

Abstract:
1. Apparatus for retrieving the optical phase and the amplitude of a nonlinear electromagnetic object wave comprising: at least one source of electromagnetic radiation probing at least one object, said object comprising at least one element generating a nonlinear interaction with said electromagnetic radiation, said nonlinear interaction resulting in the emission of nonlinear electromagnetic radiation, referred to as the nonlinear object wave, at least one detector or detector array for sensing said nonlinear object wave, a nonlinear reference wave generated from said source of electromagnetic radiation by a nonlinear interaction, and wherein said detector or detector array is configured to sense an interferogram or a hologram resulting from the interference between said nonlinear object wave and said nonlinear reference wave, said nonlinear reference wave is generated inside said object, and the apparatus further comprises at least one processing unit connected to said detector or detector array, said processing unit applies a numerical hologram reconstruction method to retrieve the amplitude and the optical phase of said nonlinear object wave, and wherein the nonlinear object wave and the linear reference wave are both produced by harmonic generation of the electromagnetic radiation emitted by the at least one source of electromagnetic radiation, or by sum or difference frequency wave generation of the electromagnetic radiation emitted by the at least one source of electromagnetic radiation, or by multiple-wave mixing through Coherent Anti-Stokes Raman Scattering of the electromagnetic radiation emitted by the at least one source of electromagnetic radiation.