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 12 of 12 for “"chirped pulse amplification"”.
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The development of high power fibre chirped pulse amplification systems
… an attractive medium for the generation and amplification of ultrashort optical pulses. Research interest in Yb-doped fiber chirped pulse amplifier (CPA) systems first appeared in the late 1990s. However, the potential advantages and capabilities of Yb-doped fiber CPA systems were not fully …
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Synchronization In Advanced Optical Communications
… is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier in high energy, ultrashort pulse amplification are reviewed. A method to overcome the fundamental limit of small stored energy inside …
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Fabrication and applications of fibre Bragg gratings
… explored. Three new techniques for fabricating chirped gratings are presented. Beams with dissimilar wavefront curvatures are interfered to give chirped gratings. With the same aim techniques of writing gratings on tapered fibres and on deformed fibres are also covered. With these techniques, a …
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Laser-Produced Plasmas for Particle Acceleration
… higher than 1018W/cm2 and sub-ps laser-pulse durations, both of which have seen rapid development since the invention of chirped pulse amplification. The laser is focused in a gas, which instantly ionises. In the created plasma, the propagating laser pulse creates a wave, which can …
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Few-cycle and cavity-enhanced optical parametric amplification
… the continued development of optical parametric amplification based sources. First, we present a white light seeded, carrier-envelope stable, degenerately pumped OPA producing near tranform-limited sub 7 fs , 3 [mu]J pulses at the driver wavelength from a long pulse, non-CEP stable Ti:sapphire …
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Ultrafast Lasers and Amplifiers based on Yb-doped Gain Materials
… spectrum. Highly energetic, broadband pulses can be used to probe the electronic and structural dynamics of some of the fastest possible chemical and biological processes. This work outlines the development of a novel ultrafast laser system operating in the 1μm wavelength regime, using …
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Adaptively shaped advanced ultrafast laser sources
… (MIR) regimes. The setup involves shaping a NIR pulse using an adaptively controlled liquid crystal spatial light modulator (LC-SLM) in a pulse shaper. The shaped NIR pulse is then transferred to the MIR via a synchronously pumped optical parametric oscillator (SPOPO).<br/><br/>Initially, …
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Investigation of laser-driven particle acceleration for the development of tunable ion sources for applications in high energy density science
Since the innovation of chirped pulse amplification by Donna Strickland and Gerard Morou in 1985, laser technology has evolved such that we can create short pulses of light (10⁻¹⁵ − 10⁻¹² seconds) with high peak powers (1015 Watts) in small, focused spots (∼a few microns). A prolific area of …
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Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources
… the generation of ultra short, tunable pulses at high average power and / or high pulse energy using synchronously pumped optical parametric oscillators (OPO) and appropriate power-scalable fibre-amplifier pump sources. Two types of pump sources with average powers up to ~100W are …
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Power scaling and nonlinear conversion in fiber-based sources at novel wavelengths
… length to maximize phase matching and nonlinear pulse generation. However, current commercially available PCFs can feature up to 10% fluctuation in core diameter uniformity. Therefore, the dispersion and nonlinear coefficient of custom-drawn and commercially available photonic crystal fibers …
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Demonstration of filament-guided electrical discharges from a high average power 1 kHz picosecond laser
… propagation of ultrashort, high energy laser pulses is of interest for applications including remote sensing, directed energy, and the guiding of lightning. In this thesis, the filamentation of high energy picosecond laser pulses at repetition rates up to 1 kHz is demonstrated and the guiding …
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Controlling Laser High-Order Harmonic Generation Using Weak Counter-Propagating Light
… light is investigated. The interfering pulses intersect the primary harmonic-generating laser pulse at the laser focus. The interfering light creates a standing intensity and phase modulation on the field, which disrupts microscopic phase matching and shuts down local high harmonic …