Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Thermal lens."”.
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Application of surface thermal lens technology combined with polarization to the study of polymers
… the characteristics of polymers by using photothermal technology. The Surface Thermal Lens (STL) technique was employed to study polymers because of its higher spatial resolution and greater sensitivity than the classical photothermal detection techniques (PDT). Zeonex [Cyclo-Olefin-Polymer] …
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Cavity ring down and thermal lens techniques applied to vibrational spectroscopy of gases and liquids.
… in liquid ethane. First, we studied the thermal lens spectroscopy (TLS) of the (Deltav = 6) C-H overtone of benzene and naphthalene in hexane and CCl4 at room temperature.
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Development of high power fibre amplifier components, systems and applications
… plate between the rotators to compensate for thermal stress induced birefringence. Using this approach the isolation was shown to be constant to greater than 60W. The isolator was also compensated for thermal lensing by balancing the positive thermal lens produced in the Faraday rotator with a …
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Solubility and spectroscopy of unsaturated hydrocarbons in cryogenic solvents.
… Transform spectroscopy is not sensible enough. Thermal Lens spectroscopy has been found to be a very sensitive technique, good for detecting samples of low concentration in transparent solutions. In addition to the traditional double-beam configuration, whose absorption process is carried out …
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Thermal and spectral effects in intracavity Raman lasers
… This thesis presents a detailed investigation of thermal and spectral effects in CW intracavity Raman lasers. A disk geometry was used to reduce the thermal lens in the laser gain crystal, thereby permitting more flexible cavity design. This facilitated experiments to probe and control the thermal …
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The study of photo-thermal lensing system and its applications
… per million (ppm). In this thesis, the photo-thermal lens setup provides another way to measure the change in the sample related to heating with sensitivity up to 10^{-6}. This technique is a pump-probe technique which depends on a change in an optical property measured by a weak probe laser …
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The dynamics and optimization of the radiation of a femtosecond diode pumped Yb:KGW laser /
… parameters using the results obtained. The thermal-lens and nonlinear Kerr medium effect on the stability of the resonator has been studied. On the basis of the results obtained an oscillator which generates 31 fs pulses has been developed. To our knowledge they are the shortest pulses …
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ADPATIVE MODE MATCHING UPGRADE FOR ADVANCED LIGO
… Laguerre-Gauss bullseyemode LG01. A cylindrical lens mode converting telescope can then optically convert the bullseye mode into a 45! rotated Hermite-Gauss pringle mode HG11. The rotated mode is perfectly shaped for detection by the existing quadrant photodiode wavefront sensors and can then be …
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Study of the physics of the power-scaling of end-pumped solid-state laser sources based on Nd:YVO<sub>4</sub>
Using a modified Mach-Zehnder interferometer the thermal lensing in Nd:YV0<sub>4</sub> was measured for several different operating conditions. The thermal lens focal length can be determined from the measured transverse phase profile. It was found that the thermal lensing was weakest for …
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High-power GaAs-based diode lasers with novel lateral designs for enhanced brightness, threshold and efficiency
… enhancements are dependent on identifying the thermal and non-thermal mechanisms that limit different aspects of BAL performance, and implementing design changes to minimize their negative impacts. In this dissertation, novel designs based on lateral structuring are devised and developed, …