title: Use of the Gerchberg-Saxton algorithm in optimal coherent anti-Stokes Raman spectroscopy.
abstract: We are utilizing recent advances in ultrafast laser technology and recent discoveries in optimal shaping of laser pulses to significantly enhance the stand-off detection of explosives via control of molecular processes at the quantum level. Optimal dynamic detection of explosives is a method whereby the selectivity and sensitivity of any of a number of nonlinear spectroscopic methods are enhanced using optimal shaping of ultrafast laser pulses. We have recently investigated the Gerchberg-Saxton algorithm as a method to very quickly estimate the optimal spectral phase for a given analyte from its spontaneous Raman spectrum and the ultrafast laser pulse spectrum. Results for obtaining selective coherent anti-Stokes Raman spectra (CARS) for an analyte in a mixture, while suppressing the CARS signals from the other mixture components, are compared for the Gerchberg-Saxton method versus previously obtained results from closed-loop machine-learning optimization using evolutionary strategies.
authors: Los Alamos National Laboratory, Los Alamos, NM 87545, USA. moored@lanl.gov
authors: D S
authors: DS
authors: Moore
authors: S D
authors: SD
authors: McGrane
authors: M T
authors: MT
authors: Greenfield
authors: R J
authors: RJ
authors: Scharff
authors: R E
authors: RE
authors: Chalmers