An investigation of the origins and efficiencies of higher-order nonlinear spectroscopic processes

✍ Scribed by Joseph E. Ivanecky III; John C. Wright

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 731 KB
• Volume: 206
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)80164-k

✦ Synopsis

We propose extending the site selection and mode selective capabilities of four-wave mixing spectroscopies to room-temperature samples using six-wave mixing to develop multiple Raman resonances. Calculations predict a coherent higher-order Raman excitation spectroscopy (CHORES) should be observable at excitation intensities > 1 GW/cmz, but there is also competition from a sequential CARS (SCARS) process. Tbe SCARS mechanism dominates over CHORES for electronically non-resonant excitations Since SCARS and CHORES have identical dependencies on both input intensities and resonances, phase-matching considerations must be used to spatially separate their respective contributions.