Document Detail

Observation of a cw dark-field signal in an absorption spectroscopic experiment using a phase locked free-electron laser
MedLine Citation:
PMID:  11018958     Owner:  NLM     Status:  Publisher    
We introduce a technique for ultrasensitive absorption spectroscopy using the GHz-rate pulse train from a phase-locked free-electron laser (FEL), in which the fractional power absorbed from one or more laser lines reappears as a signal on the dark background between the pulses emerging from the sample. Preliminary absorption experiments in 15 Torr cm of methane at 3.25 &mgr;m, using phase-locked pulses from the Mark III FEL, clearly reveal an interpulse beat signal due to absorption by adjacent molecular rotational lines which is generated only in the presence of interpulse phase coherence.
Szarmes; Madey; Straub
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Publication Detail:
Journal Detail:
Title:  Physical review letters     Volume:  84     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-10-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  UNITED STATES    
Other Details:
Languages:  Eng     Pagination:  2849-52     Citation Subset:  -    
Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA.
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