2006/06/05 by Bing Gu, Ya-Xian Fan, Jin Wang +5
Engineering · Physics and Astronomy · #Nonlinear Optical Materials Studies #Laser-Matter Interactions and Applications #Advanced Fiber Laser Technologies
paper · doi:10.1103/physreva.73.065803
We present a theoretical investigation on the open-aperture Gaussian-beam Z-scan technique for two dominant saturable absorption models, by using the Adomian decomposition method. Analytic expressions of the Z-scan traces are deduced for a cw laser and a pulsed laser, respectively; in particular, for performable simulations, the optimal sum upper limit is found. We give an experimental demonstration, in which a side-chain azobenzene polymer poly [6-[1-(4-(4-nitrophenylazo)phenyl) piperazine] hexyl methacrylate] (Pda) film behaves as a test sample. The results manifest that our theory is reasonable and the Pda film is a good saturable absorber at the wavelength of 532\phantom\rule0.3em0exnm.