Research Investigation of Laser Line Profiles (Picosecond Laser Pulses). PDF Download
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Author: William H. Glenn
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
The report discusses the application of picosecond optical pulses to high resolution imaging optical radar. A novel type of signal processing is described. An extensive bibliography of previous work on this contract is included. (Author).
Author: William H. Glenn
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
The report discusses the application of picosecond optical pulses to high resolution imaging optical radar. A novel type of signal processing is described. An extensive bibliography of previous work on this contract is included. (Author).
Author: Anthony J. DeMaria
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
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Book Description
Topics discussed include theoretical and experimental work made on the propagation of ultrashort light pulses, stimulated scattering effects, nonlinear propagation, Cerenkov radiation, organic dye lasers, and stimulated emission from laser produced plasmas. (Author).
Author: William H. Glenn
Publisher:
ISBN:
Category :
Languages : en
Pages : 105
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Book Description
The report summarizes a number of research projects concerned with the generation, measurement, and properties of picosecond laser pulses produced by mode-locked lasers. Topics discussed include a theory of the two photon absorption-fluorescence method of pulse width measurement, a statistical model of the mode-locking process that is capable of explaining many of the observed features, a comparison of the model with experimental results, experiments with time-resolved spectroscopy and experiments with a novel type of nonlinear optical element that is potentially useful for mode-locking. (Author).
Author: Anthony J. DeMaria
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
Research plan: Analysis of the propagation of ultrashort optical pulses; Measurement of nanosecond fluorescence decay time; Light amplification in absorbing media; Adiabatic inversion of quantum states; Optical rectification of mode-locked laser pulses at microwave frequencies; and Mode-locking of organic dye lasers.
Author: S.L. Shapiro
Publisher: Springer Science & Business Media
ISBN: 3662225743
Category : Science
Languages : en
Pages : 397
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Book Description
Soon after the invention of the laser, a brand-new area of endeavour emerged after the discovery that powerful ultrashort (picosecond) light pulses could be extracted from some lasers. Chemists, physicists, and engineers quickly recognized that such pulses would allow direct temporal studies of extremely rapid phenomena requiring, however, development of revolutionary ultrafast optical and electronic devices. For basic research the development of picosecond pulses was highly important because experimentalists were now able to measure directly the motions of atoms and molecules in liquids and solids: by disrupting a material from equilibrium with an intense picosecond pulse and then recording the time of return to the equilibrium state by picosecond techniques. Studies of picosecond laser pulses-their generation and diagnostic tech niques-are still undergoing a fairly rapid expansion, but a critical review of the state of the art by experienced workers in the field may be a timely help to new experimentalists. We shall review the sophisticated tools developed in the last ten years, including the modelocked picosecond-pulse-emitting lasers, the picosecond detection techniques, and picosecond devices. Moreover, we shall outline the basic foundations for the study of rapid events in chemistry and physics, which have emerged after many interesting experiments and which are now being applied in biology. An in-depth coverage of various aspects of the picosecond field should be helpful to scientists and engineers alike.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 452
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Book Description
Author: Patricia Mary Devlin-Hill
Publisher:
ISBN:
Category : Laser plasmas
Languages : en
Pages :
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Author: Juan Pablo Calderón Urbina
Publisher: Springer Nature
ISBN: 3662618869
Category : Technology & Engineering
Languages : en
Pages : 210
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Book Description
Ultra-short pulse laser processing of ultra-hard materials requires an accurate and agile experimental and analytical investigation to determine an efficient choice of parameters and settings to optimize ablation. Therefore, this work presents a quality-oriented experimental approach and an analytical approach for the modeling and validation of multi-pulse picosecond laser beam ablation on cemented tungsten carbide. This work starts with a review of literature and state-of-the-art theories of four relevant areas for this research: picosecond lasers, laser beam ablation process, cemented tungsten carbide (WC) and quality-oriented tools. Subsequently, a concept for an efficient material laser beam ablation with a picosecond laser was introduced. Furthermore, two approaches for the investigation are presented from an experimental and analytical perspective, respectively. The first approach introduced a methodology for the identification of influential parameters. It executes a quality-oriented methodology based on the SWOT analysis, cause-and-effect diagram and the variable search methodology. The conclusion of the methodology gave the interaction of pulse repetition rate and scanner speed in the form of pulse overlap and track overlap PO/TO as the most influential parameter in the maximization of the ablation rate. The second most influential factors resulted laser beam power and burst-mode. The second approach, description of the model, executes a theoretical analysis of the picosecond laser beam ablation of cemented WC by the application of the Beer-Lambert law and multi-pulse ablation modeling. The unavailable material properties were obtained by experimental investigations, like in the cases of the incubation factor and the reflectivity factor. Threshold fluence for cemented WC was determined by the application of the heat transfer theory and input power intensity was adapted to a Gaussian beam profile. At the end of the approach, power density visualizations of a picosecond laser pulse under the five available pulse repetition rates were modeled and validated. The findings from the adaptation of the Beer-Lambert law acted as basis for development of the multi-pulse laser ablation model for both single-pulse mode and burst-mode, respectively. Based on the definition of the number of pulses N irradiating the same area, the corresponding threshold fluence for N, the input fluence and incubation factor, ablation depth was modeled and experimentally validated. Finally, results and conclusions of both approaches were discussed and a framework for an efficient laser beam ablation was presented. Recommendations for further actions on research and industry were introduced at the end of the work.
Author: S.L. Shapiro
Publisher: Springer
ISBN: 9783662225752
Category : Technology & Engineering
Languages : en
Pages : 392
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Book Description
Soon after the invention of the laser, a brand-new area of endeavour emerged after the discovery that powerful ultrashort (picosecond) light pulses could be extracted from some lasers. Chemists, physicists, and engineers quickly recognized that such pulses would allow direct temporal studies of extremely rapid phenomena requiring, however, development of revolutionary ultrafast optical and electronic devices. For basic research the development of picosecond pulses was highly important because experimentalists were now able to measure directly the motions of atoms and molecules in liquids and solids: by disrupting a material from equilibrium with an intense picosecond pulse and then recording the time of return to the equilibrium state by picosecond techniques. Studies of picosecond laser pulses-their generation and diagnostic tech niques-are still undergoing a fairly rapid expansion, but a critical review of the state of the art by experienced workers in the field may be a timely help to new experimentalists. We shall review the sophisticated tools developed in the last ten years, including the modelocked picosecond-pulse-emitting lasers, the picosecond detection techniques, and picosecond devices. Moreover, we shall outline the basic foundations for the study of rapid events in chemistry and physics, which have emerged after many interesting experiments and which are now being applied in biology. An in-depth coverage of various aspects of the picosecond field should be helpful to scientists and engineers alike.
Author: Jürg Eduard Balmer
Publisher:
ISBN:
Category :
Languages : en
Pages : 64
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Book Description
