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- KurzbeschreibungFor the last decade, neodymium-doped orthovanadate has established itself as the active<br>material of choice for commercial solid-state lasers emitting in the 1 µm range, with output powers<br>from several hundred milliwatts to a few tens of watts, in continuous-wave, short nanosecond<br>Q-switched, or picosecond modelocked pulsed regimes. Its main advantages over other Nd-doped<br>hosts such as YAG are a large stimulated-emission cross section leading to a high gain, a strong<br>pump absorption allowing the efficient mode-matching of tightly-focused pump light, and a natural<br>birefringence resulting in a continuously polarized output. The main drawbacks, however,<br>are rather poor mechanical characteristics and strong thermal lensing, effectively limiting the<br>maximum applicable pump power before excessively strong and aberrated thermal lensing prevents<br>an efficient operation in a diffraction-limited beam, and ultimately the crystal&8217;s fracture.<br>Put aside the power limitation, the association of vanadate with diode end pumping allows for<br>the realization of highly efficient and reliable laser sources based on well-known technologies,<br>which provides an advantage in terms of manufacturability and cost-effectiveness over other<br>high-potential technologies such as disks and fibers.<br>This thesis introduces a novel pumping technique for Nd:YVO4 that allows for the realization<br>of significantly higher-power laser sources with a high optical-to-optical efficiency and<br>diffraction-limited beam quality, while keeping the benefits of a well-established technology. It<br>consists in pumping at a wavelength of 888 nm instead of the classic 808 nm, providing a low<br>and isotropic absorption, which results in a smooth distribution of the absorbed pump light in<br>long crystals, effectively limiting the deleterious effects of high inversion density such as crystal<br>end-facet bulging, high crystal temperature, aberrated thermal lensing, and upconversion. After<br>presenting vanadate&8217;s spectroscopic and physical characteristics, a complete analysis of the heatgenerating<br>effects is performed, allowing for side-by-side simulations of the thermal effects in<br>practical 808 nm and 888 nm pumped systems, and for an evaluation of their respective thermal<br>lensing behaviors.<br>Continuous-wave operation was thoroughly investigated, first in a multi-transversal mode<br>oscillator to assess the maximum optical efficiency with optimum pump-mode matching and the<br>thermal lensing characteristics. A TEM00 resonator was then developed with a single crystal<br>and one pump diode, providing 60 W of output power with an optical efficiency of 55% and<br>a beam quality of M2 = 1.05
- AutorLouis McDonagh
- Ausgabe1. Auflage
- VerlagCuvillier Verlag
- Seiten180 Seiten
- Gewicht246 g
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