A STUDY OF PHOTOACOUSTIC EFFECTS AND OPTICAL LIMITING IN THE SOLUTIONOF C-60 IN TOLUENE

Pulsed photoacoustic studies in solution of C-60 in toluene have been made using the 532 nm radiation from a frequency doubled Nd:YAG laser. Though C-60 is found to exhibit the phenomenon of optical limiting, t he results on photoacoustic measurements do not give any indication of multiphoton transitions as suggested in some of the earlier works. Re sults of photoacoustic measurements show that excited state absorption is the dominant process responsible for optical limiting while phenom ena like nonlinear scattering may contribute to a lesser extent.