Table of Contents
Laser Chemistry
Volume 18, Issue 4, Pages 167-176

Pressure Dependence of Degenerate Four-Wave Mixing in SO2: Effect of the Thermal Gratings

Institute of Laser Chemistry, Fudan University, Shanghai 200433, China

Received 20 May 1999

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The degenerate four wave mixing (DFWM) spectrum of the A(1A2)X(1A1) and B(1B1)X(1A1) transitions of SO2 in the 299.5–305 nm region is presented. It has been found that the DFWM signal intensities are proportional to the cube of laser intensity and the square of SO2 pressure. The DFWM signal increases dramatically with the pressure of N2 as a buffer gas. The enhancement of the DFWM signal can be mainly attributed to the thermal grating contribution.