The non-resonant signal in laser-induced grating spectroscopy of gases

✍ Scribed by D.E. Govoni; J.A. Booze; A. Sinha; F.F. Crim

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 477 KB
• Volume: 216
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)90137-p

✦ Synopsis

Laser-induced grating spectroscopy experiments at atmospheric pressures have a wavelength-independent component of the signal that limits the sensitivity of the technique. Experiments comparing this non-resonant signal to the wavelength-dependent signal show that its origin is electrostriction. The key to identifying the origin of the non-resonant signal is the time-evolution of the recurrences in intensity, as described by the condensed phase analysis of Miller, Casalegno, Nelson and Fayer. The temporal behavior of the electrostriction grating permits optimization of sensitivity to resonant signals in the presence of the interfering non-resonant contributions.