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 22 for “"ultrafast lasers"”.
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Ultrafast Lasers and Amplifiers based on Yb-doped Gain Materials
… sources have been crucial to the progression of ultrafast optical studies in the visible and near-infrared 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 …
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Towards Direct Writing Of 3-d Photonic Circuits Using Ultrafast Lasers
The advent of ultrafast lasers has enabled micromachining schemes that cannot be achieved by other current techniques. Laser direct writing has emerged as one of the possible routes for fabrication of optical waveguides in transparent materials. In this thesis, the advantages and limitations of …
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Studies of third-order nonlinearities in materials and devices for ultrafast lasers
… and medical imaging have motivated research in ultrafast optics. Demand exists for broadband components and sources as well as highly nonlinear fibers and materials. For this thesis, several different devices have been developed for such applications. Broadband saturable absorbers based on III/V …
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Sub-femtosecond precision timing distribution, synchronization and coherent synthesis of ultrafast lasers
… measurement, control and distribution of ultrafast optical pulse trains, with respect to pulse timing and phase. First, analytical analysis of the balanced optical cross-correlator (BOC) for attosecond precision pulse timing measurement is presented for both short and long crystal devices. …
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High-dimensional, multiplexed, single-shot ptychography for spatiotemporal ultrafast pulse-beam characterization
Ultrafast lasers are exciting tools that provide novel opportunities in science and industry. Ultrafast lasers are fundamentally four-dimensional, since at every point in three-dimensional space an ultrafast laser may have a different temporal profile. As such, ultrafast lasers can only be …
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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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Novel broadband light sources and pulse generation techniques at 1.5 [mu]m
… was developed for low-repetition-rate sub-100-fs ultrafast lasers and the other for high-repetition- rate femtosecond lasers. The third device bypasses generating broadband light directly from a laser altogether through the use of extra-cavity spectral broadening in a novel highly nonlinear glass …
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Controlling molecules with lasers and lasers with molecules
… control of spin in molecules using shaped ultrafast lasers and the dynamics of those lasers when their cavities are modified to include programmable molecular masks. The ability to control quantum phenomena has had several large successes over the last decade. This field, known as Quantum …
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The Development of a Novel Femtosecond Xuv Light Source to Do Spectroscopy of Atoms and Molecules.
Technological advances in ultrafast lasers has allowed light with pulsewidths less than 100 femtoseconds and an incredible high intensity ( I >1017 watts/cm2) to be obtained. When an atomic or molecular medium is exposed to such an intense field, the interaction between the medium and the field is …
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Time Domain Spectroscopy of Graphene
… response of graphene and graphene fragments to ultrafast optical pulses. I will first describe how we created few-cycle optical pulses for interacting with the graphene lattice. These pulses are created through filamentation based pulse compression. I studied how the filamentation process can be …
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Ultrafast sources of entangled photons for quantum information processing
… quantum computation. SPDC is often used with ultrafast lasers to generate photon pairs with precise timing and engineered spectral properties. In this thesis, we focused on two photonic QIP applications using ultrafastpumped SPDC. We first pursued the design and implementation of a pulsed …
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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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Coherent Terahertz Control and Ultrafast Spectroscopy of Layered Antiferromagnets
… observing responses in others, made possible by ultrafast lasers with femtosecond time resolution. These advancements not only showcase the capability of ultrafast experiments in understanding complex material properties but also demonstrate the manipulation of ordered phases at ultrafast …
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High speed mask-less laser-controlled precision micro-additive manufacture
… novelty in the technique was the usage of pulsed ultrafast lasers instead of continuous wave lasers in pyrolytic dissociation of the chemical precursor. The motivation of the study was that (1) ultrafast laser pulses have smaller heat affected zones thus the deposition resolution would be higher, …
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Development of an ultrafast laser ultra-precision machining platform
… Currently, manufacturing techniques using ultrafast lasers are limited with regards to accuracy and repeatability. This body of work investigates how to develop an ultra-precision ultrafast laser manufacturing platform. From literature it was found that there are a significant number of …
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Ultrafast dynamics in quantum materials probed by time-and-momentum-resolved techniques
… utilizing several multi-resolution techniques. Ultrafast electron diffraction (UED) and time-and-angle-resolved photoemission spectroscopy (trARPES) are tools that I co-developed with my colleagues at MIT in the past several years. Supplemented by the time-resolved X-ray diffraction (trXRD) …
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Phase and Polarization Modulations based on LCOS SLM
… its potential for this application in tailoring ultrafast lasers writing beam for optical data storage. In data writing process, a light filed of target data pattern (multi-beam arrays) with target linear polarization state is required to encode information onto the nanograting structure created …
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BioLaser: Establishing a High-Resolution Laser Ablation Tomography Platform for UK Bioimaging Research
… to these requirements a novel proof-of-concept ultrafast laser ablation tomography system named “BioLaser” was proposed. A proof-of-concept BioLaser system has been built using an existing ultrafast laser platform as a base. Several interchangeable high-resolution microscopes are integrated, as …
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Homodyne High-harmonic Spectroscopy: Coherent Imaging of a Unimolecular Chemical Reaction
At the heart of high harmonic generation lies a combination of optical and collision physics entwined by a strong laser field. An electron, initially tunnel-ionized by the field, driven away then back in the continuum, finally recombines back to rest in its initial ground state via a radiative …
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