US 12,007,274 B2
Device and method for ultrashort pulse temporal measurement
Miguel Nicolau Da Costa Ribeiro De Miranda, Lund (SE); Chen Guo, Lund (SE); Maïté Louisy, Lund (SE); Cord Louis Arnold, Lund (SE); and Anne Genevieve L'Huillier Wahlstrom, Lund (SE)
Assigned to SPHERE ULTRAFAST PHOTONICS SA, Oporto (PT)
Appl. No. 17/292,659
Filed by SPHERE ULTRAFAST PHOTONICS SA, Oporto (PT)
PCT Filed Nov. 8, 2018, PCT No. PCT/IB2018/058792
§ 371(c)(1), (2) Date May 10, 2021,
PCT Pub. No. WO2020/095095, PCT Pub. Date May 14, 2020.
Prior Publication US 2022/0011166 A1, Jan. 13, 2022
Int. Cl. G01J 11/00 (2006.01); G01R 29/08 (2006.01)
CPC G01J 11/00 (2013.01) [G01R 29/08 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for ultrashort pulse measurement comprising the following steps:
introducing a controlled chirp, negative or positive, to an incoming ultrashort light pulse to be measured;
selecting a homogeneous portion of the transverse spatial beam profile of said light pulse;
propagating the beam resulting from the previous step through an arrangement of optical elements for imparting different spectral phases to different spatial components of said beam;
applying a nonlinear optical process to the beam resulting from the previous step for each different spatial component of said beam;
recording a bi-dimensional set of data comprising the spectrum of the nonlinear signal generated for each different spatial component of said beam; and
calculating, by an electronic data processor, a numerical iterative algorithm to said recorded spectral image data, to retrieve the amplitude and phase of the electric field of the ultrashort light pulse.