00000ctm a22000003a 4500 UP-99796217608435755 Buklod 20230215101310.0 m |o d | ta 080703s xx d r |||| u| (iLib)UPD-00035509517 DSCI eng LG995 2008 P51 M36 Manahan, Grace Gloria Experimental and numerical analysis of image wavelength conversion with a Raman shifter Grace Gloria Manahan. xii, 68 leaves Computer print out. Thesis (M.S. Physics)--University of the Philippines, Diliman. We investigate the propagation dynamics through a nonlinear Raman-active medium of an image-carrying laser excitation beam and its wavelength conversion. A numerical model based on the finite difference (FD) method is used to solve the stimulated Raman scattering (SRS) wave equations. Different images at the laser excitation wavelength are simulated for down conversion to the Strokes wavelength. The spatial and intensity behaviour of the Stokes beams are examined as a function of the excitation intensity and Raman gain. Experiments on the image wavelength conversion is conducted with the second harmonics (532 nm) of the Nd:YAG laser and a hydrogen gas as the Raman medium. The images generated at the Stokes wavelength (683 nm) are studied under two parameters, the laser excitation intensity and hydrogen gas pressure. A comparison of the numerical and experimental images is made. It was found that the FD method of solving the SRS wave equations is sufficient to predict the experimental results. Nonlinear difference equations. Wavelengths. Raman effect. Thesis FI UPD DARCHIVES LG995 2008 P51 M36 Thesis