Laser Frequency Conversion by Stimulated Raman Scattering

in the Near Infrared Spectral Region

Author: Oliver Lux
Pages: 193
Language: English
Publication date: 30/11/-0001
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Dissertation Physik
The present thesis is divided in three main parts. The following two chapters provide the theoretical background of the investigated physical effects. Chapter 2 deals with the spectral and spatial properties of solid-state lasers which are of particular interest in terms of trace gas detection. At the beginning, several mechanisms aiming at longitudinal mode control are introduced where the emphasis is placed on the method of injection-seeding. Afterwards, thermally induced phase distortions which impose severe limitations on the spatial beam quality are discussed together with techniques to overcome these difficulties such as birefringence compensation an the phase conjugation.
The theoretical description of spontaneous and stimulated Raman scattering is presented in chapter 3. While a quantum mechanical approach gives insight into the relationship between both phenomena, the classical treatment allows for the derivation of Stokes wave equations as well as for the explantation of coupled-wave problems such as Raman fourwave mixing. In the course of the theoretical elaboration, the Raman gain coefficient is derived both quantum mechanically and classically paying special attention on consistency with the International System of Units (SI).
The second part of the work is closely related to the experimental results of the DFG project mentioned above. In chapter 4, the spectroscopic analysis of 17 crystalline materials.....
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