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 24 for “"ultrashort pulse"”.
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Ultrashort pulse generation from diode laser devices
… experiment-based study of generation of ultrashort optical pulses from diode lasers. Simple and cost-effective techniques were used to generate high power, high quality optical short pulses at various wavelength windows. The major achievements presented in the thesis is summarised as …
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Ultrashort pulse generation with solid state Cr⁴⁺:YAG laser
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2003.
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Development of ultrashort pulse fiber lasers for optical communication utilizing semiconductor devices
… is considered theoretically. Picosecond pulses are produced from an Er/Yb waveguide laser using a semiconductor saturable absorber mirror, and the influence of two-photon absorption on mode-locking is studied. A semiconductor mirror exhibiting only induced absorption is used to stabilize …
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Novel Approaches to Power Scaling In Mode-Locked Laser Diode Based Ultrashort Pulse Sources
… average output power of mode-locked laser diode ultrashort pulse sources were investigated. This was done with the motivation of developing mode-locked laser diode based light sources for nonlinear bioimaging applications to which high repetition rate pulse sources such as diode lasers could be …
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Pre-clinical evaluation of lethal and sublethal DNA damage in human cell cultures by ultrashort pulse and ultra-high dose rate laser accelerated protons
Particle therapy has been cited as an effective treatment modality, compared to photons and electrons-based therapies for solid tumors located in close proximity to critical organs, such as spinal cord, brain and heart. Numerous studies have demonstrated the feasibility of using high LET particles …
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Development and application of saturable absorbers to femtosecond solid-state laser mode-locking
… have had a major impact on the field of ultrashort pulse generation by increasing the stability and reliability of ultrashort pulse lasers, making them more useful in many applications. These versatile devices can be grown both epitaxially with molecular beam epitaxy and non-epitaxially …
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Modeling of nonlinear ultrashort optical pulse propagation
… scripting interface for simulating a host of ultrashort pulse propagation phenomena. With the proliferation of ultrashort laser technologies, the demand for efficient and accurate simulations has grown significantly. Here I introduce a linear-operator-based formalism for nonlinear pulse …
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Mode-locked laser diodes for the 750 – 770 nm spectral region
Ultrashort pulse lasers are widely used in research, industry, medicine, and communications, because of their characteristics of narrow pulse width, high repetition frequency, broad spectrum and high peak power. They are influencing and changing our world. Mode-locking is an effective way to …
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Analysis of variation in on-chip waveguide distribution schemes and optical receiver circuits
… index variations. Then, the robustness of an ultrashort pulse-based receiver circuit architecture is analyzed. Some variation sources considered are optical input power variation, load capacitance variation, parasitic capacitive coupling, and power supply noise. Simulation results show that, …
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Synchronization In Advanced Optical Communications
… of this dissertation 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 …
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The development of large area saturable Bragg reflectors for the generation of widely-tunable ultra-short pulses
… for the generation of widely tunable ultra-short pulses for various laser systems. The III-V based SBRs comprise of layers, whose thicknesses correspond to the wavelength of the laser system that is to be mode-locked. To form short pulses, SBRs with broadband reflectivity and large area (hundreds …
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Femtosecond pulse generation in surface-emitting semiconductor lasers
… significant advances towards the goal of stable ultrashort pulse generation in mode-locked optically pumped vertical external-cavity surface-emitting lasers (VECSELs). Continuous wave VECSELs were first designed as a type of semiconductor laser capable of producing high output power in near …
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Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
… for the intensity and phase characterisation of ultrashort optical pulses. Essentially, FROG involves mixing an ultrashort optical pulse with its time-delayed replica, or another pulse, in a nonlinear material or device to yield a two dimensional data set called a spectrogram, from which the …
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Damages in Transparent Materials by Ultrashort Laser Pulse
Ultrashort lasers that generate laser pulses down to picosecond and femtosecond range have advanced over the past decade from delicate lab systems to robust industry machines. The availability of stable ultrashort laser systems opens up a wide range of exciting applications from transparent …
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Microwave Interferometric Measurements of Electron Density in Laser-Generated Plasma Channels
… channels were generated by sub-picosecond laser pulses ($\lambda=$248~nm, 40~mJ per pulse) produced by a hybrid Ti:sapphire/KrF excimer amplifier system. The ultrashort pulse duration resulted in a $\delta$-function excitation source, allowing the subsequent plasma decay to be explored without …
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Time resolved dynamics of charge density waves in solids : an uncorrelated and a correlated case
… resolved optical experiments in this work, an ultrashort (< 100 fs) pump pulse perturbs the CDW system out of equilibrium, and another ultrashort pulse probes the changes in reflectivity following the photoexcitation. We focus on two solids with charge density wave order, La₁.₈₇₅Ba₀.₁₂₅CuO₄ and …
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Kelių optinių ciklų trukmės impulsų parametrinis stiprinimas infraraudonojoje srityje /
… this thesis is to generate and amplify few cycle pulses in the infrared region. In this thesis, two approaches were introduced for few cycle pulse parametric amplification at 800 nm and 1.5 μm. First approach is dedicated for prospects for increasing average power of OPCPA via multi-beam pumping; …
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The development of components for ultrafast all-optical communication networks
… of Tbps, lasers must be capable of producing pulses shorter than a picosecond. Mode-locking of laser cavities is an attractive method of ultrashort pulse generation. A semiconductor saturable absorber mirror is a monolithically integrated device utilized for passive mode-locking of a wide …
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Ultrafast Machining of High Temperature Superconducting Nanostructures for Novel Mesoscale Physics
… the physical and electrical damage induced by an ultrashort pulse laser was investigated by scanning electron microscope (SEM) characterization and transport measurements over a range of step-wise machined YBCO microbridges. Assuming the damage is limited to the machined edge, an electrical …
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