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 20 of 27 for “"diode pumped"”.
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High-brightness diode-pumped waveguide lasers
… this thesis are advances toward high-brightness diode-pumped planar waveguide (PW) lasers. Efficient and compact planar waveguide lasers are made possible by their geometry, which is compatible with that of high-power diode lasers, has very good thermal management characteristics, and delivers …
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Multi-Watt, diode-pumped planar waveguide lasers
This thesis reports on progress towards diode-bar pumped crystal waveguide lasers with a high-power, high-quality output. <br/><br/>It is shown that in order to accommodate the highly divergent, non-diffraction limited output from a diode-bar pump source, a waveguide with a relatively large …
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High-power diode-pumped ytterbium-doped fibre-laser
… 7.7 mJ was achieved with a large core cladding pumped ytterbium doped Q-switched fibre laser.
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The dynamics and optimization of the radiation of a femtosecond diode pumped Yb:KGW laser /
… of the present work is to examine the dynamics diode pumped femtosecond Yb:KGW laser consisting of an oscillator and a regenerative amplifier and to optimize its radiation parameters using the results obtained. The thermal-lens and nonlinear Kerr medium effect on the stability of the resonator …
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LASER DIODE PUMPED ND: YAG SOLID STATE LASER FOR APPLICATIONS IN SECOND HARMONIC GENERATION
… thesis, a new pumping approach for the YAG laser pumped by laser diode is proposed to achieve high energy/power performances. In this approach, the central part of the pump beam from the laser diode is absorbed directly by the YAG rod through its convex end surface, which is very much like the …
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Low-cost, highly efficient, and tunable ultrafast laser technology based on directly diode-pumped Cr:Colquiriites
… tunable femtosecond laser technology based on diode-pumped Cr:Colquiriite gain media (Cr:LiCAF, Cr3+:LiSAF and Cr:LiSGaF). By using inexpensive single-mode diodes ($150) as the pump source, we have obtained continuous-wave (cw) output powers >250-mW with slope efficiencies >50%. Record cw …
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All-solid-state femtosecond medical lasers and nonlinear laser-tissue interactions
Diode pumped all-solid-state ultrafast lasers are promising for mini-invasive refractive surgery and keratoplasty. A funda mental systematical study concerning ultrafast laser tissue interactions is crucial before applying the state of the art laser technology to ophthalmic applications. Porcine …
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Nonlinear optical frequency conversion of mode-locked all-solid-state lasers
… design, development and implementation of robust diode-pumped solid-state mode-locked lasers as a platform for nonlinear optical frequency conversion experiments. One objective is to create an ultrashort-pulsed source that is tunable between λ= 600nm and λ= 700nm, since currently no other laser …
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Energy exchange processes in erbium-doped fluoride glasses
… crystals. In particular interest has focused on diode-pumped lasers and optical waveguide amplifiers based on rare earth ions. This thesis is concerned with developing a model, which can explain the population and depopulation processes which are responsible for the spectroscopic behaviour of …
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Demonstration of filament-guided electrical discharges from a high average power 1 kHz picosecond laser
… is studied. The design and performance of the diode-pumped Yb:YAG chirped pulse amplification (CPA) system utilized for this experiment is also described. Diode-pumped solid state lasers in a CPA layout have emerged as the modern choice for the generation of high pulse energies at high …
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Ultrafast Lasers and Amplifiers based on Yb-doped Gain Materials
… at rates ranging from 0.1 MHz to 1 MHz. Two diode-pumped, large-mode-area, ytterbium-doped fibers provide high power amplification. A large-core fiber amplifier delivers single mode output up to 10W average power and a photonic-crystal rod amplifier provides final amplification up to 100 W. …
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Terbium-based fluoride and oxide crystals for visible lasers
… values for any direct emitting yellow laser. Diode-pumped laser emission on this crystal was accomplished with a 52% of slope efficiency at 544 nm in the green and a 22% at 587.4 nm in the yellow, entailing the first demonstration of a diode pumped Tb3+-based solid-state laser, to the best of …
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Fluorescence Detectors for Proteins and Toxic Heavy Metals
… protein fluorescence using a visible 532 nm diode-pumped nano laser as the excitation source. Proteins that exhibit intrinsic fluorescence must contain at least one tryptophan, tyrosine, or phenylalanine residue in their amino acid sequences. The detector was characterized and was found to …
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Atomic alkali lasers pumped by the dissociation of photoexcited alkali-rare gas collision pairs
… broad as 5 nm. This characteristic makes excimer-pumped alkali-vapor lasers (XPALs) attractive candidates for the spatial mode conversion of laser diode arrays with nominal linewidths of 2 nm in order to produce high quality (M2 1) beams. Quantum e ciencies exceeding 98% have been measured and may …
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Solution-processable, mechanically-flexible lasers
… the development of, to our knowledge, the first diode-pumped, mechanically flexible organic lasers encapsulated with thin-glass for high photostability. Other important outcomes include mechanical wavelength tuning of lasers, record performance for colloidal quantum dot lasers optically-pumped in …
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Directly diode-laser-pumped titanium-doped sapphire lasers
… multi-watt neodymium or optically pumped semiconductor laser. Ideally, such intricate and expensive pump lasers would be replaced by compact, robust and cheap diode lasers. Two factors have prevented this: first, Ti:sapphire has a broad but relatively weak absorption in the …
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Operating Regimes and Automated Control of Holmium and Thulium Non-linear Polarisation Rotation Mode-locked Fibre Optic Lasers
… To the best of our knowledge, this is the first diode-pumped NLPR mode-locked holmium source in the 2µm waveband. An automation mechanism was devised and implemented. Characterisation revealed that the source produced 770 fs pulses with a central wavelength of 2061 nm, a repetition rate of 17 MHz …
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Highly Efficient Thermal Ablation of Silicon and Ablation in Other Materials
… to current techniques using ultraviolet diode-pumped solid state (UV DPSS) systems. Where thermal effects such as heat-affected zones (HAZ) cannot be overcome, high intensity nonlinear ablation allows the processing of lead zirconate titanate (PZT) for high frequency arrays (used in …
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Research Towards the Development of an Optically Pumped Cesium Dimer Laser
… community; they are the metal vapor lasers pumped with laser diodes (DPAL). The absorption spectra of most alkali vapor lasers are roughly 1/100th of the width of the diode pump width and broadening is desired to achieve the best overlap of emission width and absorption width. Mixing of a …
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