Document Detail

Incorporating real time velocity map image reconstruction into closed-loop coherent control.
MedLine Citation:
PMID:  25430096     Owner:  NLM     Status:  In-Data-Review    
We report techniques developed to utilize three-dimensional momentum information as feedback in adaptive femtosecond control of molecular dynamics. Velocity map imaging is used to obtain the three-dimensional momentum map of the dissociating ions following interaction with a shaped intense ultrafast laser pulse. In order to recover robust feedback information, however, the two-dimensional momentum projection from the detector must be inverted to reconstruct the full three-dimensional momentum of the photofragments. These methods are typically slow or require manual inputs and are therefore accomplished offline after the images have been obtained. Using an algorithm based upon an "onion-peeling" (also known as "back projection") method, we are able to invert 1040 × 1054 pixel images in under 1 s. This rapid inversion allows the full photofragment momentum to be used as feedback in a closed-loop adaptive control scheme, in which a genetic algorithm tailors an ultrafast laser pulse to optimize a specific outcome. Examples of three-dimensional velocity map image based control applied to strong-field dissociation of CO and O2 are presented.
C E Rallis; T G Burwitz; P R Andrews; M Zohrabi; R Averin; S De; B Bergues; Bethany Jochim; A V Voznyuk; Neal Gregerson; B Gaire; I Znakovskaya; J McKenna; K D Carnes; M F Kling; I Ben-Itzhak; E Wells
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  85     ISSN:  1089-7623     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  113105     Citation Subset:  IM    
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