公开(公告)号：US11231328B2

公开(公告)日：2022-01-25

申请号：US16753357

申请日：2018-10-05

Applicant: FEMTO EASY

Inventor： Antoine Dubrouil

IPC: G01J11/00 ,  G01J3/02 ,  G01J3/14 ,  G01J3/28

Abstract: An optical analysis method and assembly for analysing an ultrashort laser pulse, the assembly includes a single-shot optical autocorrelator, having a polarity separator for angular separation of an incident laser radiation beam with fundamental frequency (ω) into two laser radiation beams with the fundamental frequency and linear polarities which are orthogonal to one another, the two beams forming angle therebetween so that the beams at least partially overlap at the output of the separator, a type-II nonlinear crystal receives the at least partially overlapping beams and generates, at the output of the crystal, a single laser radiation beam with harmonic frequency (2ω). A spectral filtering device selectively allows the passage of the single laser radiation beam while blocking the laser radiation beams with fundamental frequency. The non-linear crystal, spectral filtering device, and detection system detect an intensimetric single-shot autocorrelation trace of the order of two at the harmonic frequency.