Title :
Diffractive-optics based fifth-order Raman spectroscopy of ultrafast liquid dynamics
Author :
Kubarych, K.J. ; Milne, C.J. ; Lin, S. ; Astinov, V. ; Miller, R.J.D.
Author_Institution :
Departments of Chem. & Phys., Toronto Univ., Ont., Canada
Abstract :
Summary form only given. With a single diffractive optic it is possible to create a beam geometry which significantly phase mismatches the cascaded intermediates while maintaining near-perfect phase matching of the direct, fifth-order signal. Additionally, the diffractive optic provides passive phase-locking (/spl sim//spl lambda//50) necessary to implement heterodyne detection by interfering a reference local oscillator with the generated signal field. We present studies of liquid CS/sub 2/ where, in addition to the phase-contrast inherent in a heterodyne measurement, the effects of other variables, such as polarization and pathlength, distinguish the direct fifth-order response from the lower-order cascades.
Keywords :
Raman spectra; Raman spectroscopy; carbon compounds; diffractive optical elements; heterodyne detection; high-speed optical techniques; optical phase matching; CS/sub 2/; CS/sub 2/ liquid; beam geometry; cascaded intermediates; diffractive optic; direct fifth-order signal; fifth-order Raman spectroscopy; fifth-order response; generated signal field; heterodyne detection; heterodyne measurement; lower-order cascades; near perfect phase matching; passive phase-locking; path length; phase mismatches; phase-contrast; polarization; reference local oscillator; ultrafast liquid dynamics; Geometrical optics; Local oscillators; Optical diffraction; Optical frequency conversion; Optical mixing; Phase detection; Raman scattering; Signal generators; Spectroscopy; Ultrafast optics;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-663-X
DOI :
10.1109/QELS.2001.961921
