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Techniques For Temporal Contrast Enhancement And Phase Characterisation Of Ultra Short Laser Pulses
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Book Synopsis Techniques for Temporal Contrast Enhancement and Phase Characterisation of Ultra-short Laser Pulses by : Ahmed Baqer Ridha Sharba
Download or read book Techniques for Temporal Contrast Enhancement and Phase Characterisation of Ultra-short Laser Pulses written by Ahmed Baqer Ridha Sharba and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Retrieval and Time-frequency Methods in the Measurement of Ultrashort Laser Pulses by :
Download or read book Phase Retrieval and Time-frequency Methods in the Measurement of Ultrashort Laser Pulses written by and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently several techniques have become available to measure the time- (or frequency- ) dependent intensity and phase of ultrashort laser pulses. One of these, Frequency-Resolved Optical Gating (FROG), is rigorous and has achieved single-laser-shot operation. FROG combines the concepts of time-frequency analysis in the form of spectrogram generation (in order to create a two-dimensional problem), and uses a phase-retrieval-based algorithm to invert the experimental data to yield the intensity and phase of the laboratory laser pulse. In FROG it is easy to generate a spectrogram of the unknown signal, and inversion of the spectrogram to recover the signal is the main goal. Because the temporal width of a femtosecond laser pulse is much shorter than anything achievable by electronics, FROG uses the pulse to measure itself. In FROG, the laser pulse is split into two replicas of itself by a partially reflecting beamsplitter, and the two replicas interact with each other in a medium with an instantaneous nonlinear-optical response. This interaction generates a signal field that is then frequency-resolved using a spectrometer. The spectrum of the signal field is measured for all relevant values of the temporal delay between the two pulses. Here, the authors employ FROG and FROG related techniques to measure the time-dependent intensity and phase of an ultrashort laser pulse.
Book Synopsis Time-resolved Characterization of Ultrashort Pulse Propagation by : Matthew Murray Springer
Download or read book Time-resolved Characterization of Ultrashort Pulse Propagation written by Matthew Murray Springer and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The propagation of ultrashort femtosecond laser pulses in linear dielectric materials is determined in the time, space, and frequency domains by linear Maxwell optics through dispersion and diffraction. For intense pulses, pulse propagation is additionally modified by nonlinearities in the medium such as the optical Kerr effect, plasma generation, and self-phase modulation. In this work we report the results of several experiments on the propagation of ultrashort pulses. In the linear regime, we characterize the temporal evolution of an ultrashort pulse during propagation through a linear dielectric under anomalous dispersion. Under these conditions the pulse evolution departs from the group velocity and group delay dispersion approximations, which leads to the formation of optical precursors. We describe an experiment which observes the propagation of optical precursors in a bulk condensed-matter dielectric. We generate ultrashort laser pulses and propagate the pulses through a bulk dye with an absorption resonance turned to the center wavelength of the femotsecond pulse. The pulse is then characterized in the time domain before and after propagation. Through numerical simulation we verify that the behavior of the precursors in the temporal pulse profille corresponds with the classical model. Under very high intensity laser pulses, the nonlinearities induced by the propagation of the intense ultrashort pulse produce changes in the complex refractive index of the nonlinear material. We report the results of experiments involving time-resolved imaging of the propagation of ultrashort pulses in dielectric materials. We experimentally observe and characterize these effects through a weak-probe imaging effect which directly measures the nonlinearity in a time-resolved manner. In these experiments an intense femtosecond laser pulse is propagated in a nonlinear intensity regime while an unfocused low-intensity femtosecond pulse is used as to probe the nonlinear pulse. We use this technique to characterize femtosecond pulses in air and liquid, especially in the regime of optical filamentation. We subsequently calculate parameters such as the plasma density, the transverse extent, and the instantaneous refractive index within the femtosecond laser fillament under conditions which are not accessible through most standard pulse measurement techniqes. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/151868
Book Synopsis Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses by : Rick Trebino
Download or read book Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses written by Rick Trebino and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Frequency-Resolved Optical-Gating (FROG) technique has revolutionized our ability to measure and understand ultrashort laser pulses. This book contains everything you need to know to measure even the shortest, weakest, or most complex ultrashort laser pulses. Whether you're an undergrad or an advanced researcher, you'll find easy-to-understand descriptions of all the key ideas behind all the FROG techniques, all the practical details of pulse measurement, and many new directions of research. This book is not like any other scientific book. It is a lively discussion of the basic concepts. It is an advanced treatment of research-level issues.
Book Synopsis Spectral and Temporal Modulation and Characterization of Femtosecond Ultra-short Laser Pulses by : Gaelle Carine Mbanda Nsoungui
Download or read book Spectral and Temporal Modulation and Characterization of Femtosecond Ultra-short Laser Pulses written by Gaelle Carine Mbanda Nsoungui and published by . This book was released on 2012 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Femtosecond Laser Pulses by : Mounir Khelladi
Download or read book Femtosecond Laser Pulses written by Mounir Khelladi and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this contribution some basic properties of femtosecond laser pulse are summarized. In sections 2.1,Äì2.5 the generation of femtosecond laser pulses via mode locking is described in simple physical terms. In section 2.6 we deal with measurement of ultrashort laser pulses. The characterization of ultrashort pulses with respect to amplitude and phase is therefore based on optical correlation techniques that make of the short pulse itself. In section 3 we start with the linear properties of ultrashort light pulses. However, due to the large bandwidth, the linear dispersion is responsible for dramatic effects. To describe and manage such dispersion effects a mathematical description of an ultrashort laser pulse is given first before we continue with methods how to change the temporal shape via the frequency domain. The chapter ends with a paragraph of the wavelet representation of an ultrashort laser pulse.
Book Synopsis Ultrashort Light Pulses by : S.L. Shapiro
Download or read book Ultrashort Light Pulses written by S.L. Shapiro and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Ultrashort Pulse Characterization and Coherent Time-frequency Light Processing by : Aleksandr S. Radunsky
Download or read book Ultrashort Pulse Characterization and Coherent Time-frequency Light Processing written by Aleksandr S. Radunsky and published by . This book was released on 2013 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Over the past several decades ultrafast laser science and technology has evolved into an extensive and diverse yet still one of the most rapidly growing and developing areas of optics. This evolution has been one of mutual interdependence. Each current generation of technological innovations not only solves the specific problems it was designed for, but uncovers new application opportunities and enables the exploration of new basic research areas. In turn, these new challenges will give rise to the next generation of technological improvements born of the currently existing technologies and the advances in fundamental scientific knowledge and understanding. Ultrashort pulse characterization has always been an essential part of this ultrafast optics evolution. The thesis makes yet another contribution to it by describing the principle, design, construction, development and operation of a novel interferometric ultrashort pulse characterization device. It consists of a new implementation of spectral-shearing interferometry for reconstructing the electric field of ultrashort pulses, requiring only a single optical element to encode the temporal field of the pulse under test. The technique relies on an asymmetric group velocity matching type II sum frequency generation process in a single long nonlinear crystal. We analyze the performance of the device for a wide range of experimentally available input pulse parameters. The device - potential building block for the future generations of ultrashort diagnostics - proves a practical, elegant, compact, robust, and sensitive option for complete amplitude and phase ultrashort pulse characterization. As the femtosecond systems of increasingly larger bandwidth become a widespread reality, the detrimental effects of dispersion require careful consideration. Dispersive pulse distortion degrades longitudinal resolution of broadband interferometric imaging methods such as optical coherence tomography and lowcoherence interferometry. We address the issue with a novel signal processing dispersion compensation method. This numerical technique improves the axial resolution without a priori knowledge of the material dispersive properties of the sample under consideration. The dispersion compensation is based on the generalized temporal fourth order field autoconvolution function computed from the readily available experimental interferometric scans and has an intuitive depiction in the time-frequency phase-space via the Wigner distribution function formalism"--Page viii-ix.
Book Synopsis Ultrashort Pulse Lasers and Ultrafast Phenomena by : Takayoshi Kobayashi
Download or read book Ultrashort Pulse Lasers and Ultrafast Phenomena written by Takayoshi Kobayashi and published by CRC Press. This book was released on 2023-03-21 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the basic physical principles of techniques to generate and ultrashort pulse lasers and applications to ultrafast spectroscopy of various materials covering chemical molecular compounds, solid-state materials, exotic novel materials including topological materials, biological molecules and bio- and synthetic polymers. It introduces non-linear optics which provides the basics of generation and measurement of pulses and application examples of ultrafast spectroscopy to solid state physics. Also it provide not only material properties but also material processing procedures. The book describes also details of the world shortest visible laser and DUV lasers developed by the author’s group. It is composed of the following 12 Sections: The special features of this book is that it is written by a single author with a few collaborators in a systematic way. Hence it provides a comprehensive and systematic description of the research field of ultrashort pulse lasers and ultrafast spectroscopy. Generation of ultrashort pulses in deep ultraviolet to near infrared Generation of ultrashort pulses in terahertz Carrier envelope phase (CEP) Simple NLO processes with a few colors Multi-color involved NLO processes Multi-color ultrashort pulse generation NLO materials NLO processes in time-resolved spectroscopy Low dimension materials Conductors and superconductors Chemical reactions and material processing Photobiological reactions
Book Synopsis Controlling Light-Matter Interactions and Spatio-Temporal Properties of Ultrashort Laser Pulses by : Matthew Anthony Coughlan
Download or read book Controlling Light-Matter Interactions and Spatio-Temporal Properties of Ultrashort Laser Pulses written by Matthew Anthony Coughlan and published by . This book was released on 2012 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SPECIFIC method a fast and accurate method for generating shaped femtosecond laser pulses. The femtosecond pulses are user specified from pulse parameters in the temporal domain. The measured spectral and recovered temporal phase and amplitudes from SEA TADPOLE are compared with the theoretical pulse profile from the user specified input. The SPECIFIC method has been shown to be a technique that can generate a diverse array of spectral/temporal phase and amplitude as well as polarization pulse shapes for numerous scientific applications. The spatio -temporal -spectral properties of focusing femtosecond laser pulses are studied for several pulse shapes that are important for non-linear spectroscopic studies. We have shown with scanning SEA TADPOLE that the spatio-spectral phase of focusing double pulse profile changes across the laterally across the beam profile. The spectral features of the sinusoidal spectral phase shaped pulse has been shown to tilt at with a changing angle away from the focus of the lens. Using spatio-spectral coupling, we have shown that multiple spatio-temporal foci can be generated along and perpendicular to the focusing direction of a femtosecond laser pulse. The spatial position of the spatio-temporal foci is controlled optically. Using sinusoidal spectral phase modulated pulse trains fragment ion production from Benzonitrile parent molecule can be controlled. A spectral transmission window perturbed the temporal pulse amplitudes resulting in fragment ion production dependant on spectral window position. The spectral window ion production was shown to also be dependant on temporal phase sequence.
Book Synopsis Measurement and characterization of ultrashort laser pulses by correlative technique; a theoretical and experimental treatment by : ז.ג. באומן
Download or read book Measurement and characterization of ultrashort laser pulses by correlative technique; a theoretical and experimental treatment written by ז.ג. באומן and published by . This book was released on 1982 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Ultrashort Laser Pulses by : Steven P. Jensen
Download or read book Characterization of Ultrashort Laser Pulses written by Steven P. Jensen and published by . This book was released on 2001 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterisation and Optimization of Ultrashort Laser Pulses by : James Macpherson
Download or read book Characterisation and Optimization of Ultrashort Laser Pulses written by James Macpherson and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Femtosecond Laser Pulses by : Claude Rulliere
Download or read book Femtosecond Laser Pulses written by Claude Rulliere and published by Springer Science & Business Media. This book was released on 2005 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the second edition of this advanced textbook written for scientists who require further training in femtosecond science. Four years after pub- cation of the ?rst edition, femtosecond science has overcome new challenges and new application ?elds have become mature. It is necessary to take into account these new developments. Two main topics merged during this period that support important scienti?c activities: attosecond pulses are now gen- ated in the X-UV spectral domain, and coherent control of chemical events is now possible by tailoring the shape of femtosecond pulses. To update this advanced textbook, it was necessary to introduce these ?elds; two new ch- ters are in this second edition: “Coherent Control in Atoms, Molecules, and Solids”(Chap.11)and“AttosecondPulses”(Chap.12)withwell-documented references. Some changes, addenda, and new references are introduced in the ?rst edition’s ten original chapters to take into account new developments and updatethisadvancedtextbookwhichistheresultofascienti?cadventurethat started in 1991. At that time, the French Ministry of Education decided that, in view of the growing importance of ultrashort laser pulses for the national scienti?c community, a Femtosecond Centre should be created in France and devoted to the further education of scientists who use femtosecond pulses as a research tool and who are not specialists in lasers or even in optics.
Book Synopsis Optically Induced Nanostructures by : Karsten König
Download or read book Optically Induced Nanostructures written by Karsten König and published by Walter de Gruyter GmbH & Co KG. This book was released on 2015-05-19 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructuring of materials is a task at the heart of many modern disciplines in mechanical engineering, as well as optics, electronics, and the life sciences. This book includes an introduction to the relevant nonlinear optical processes associated with very short laser pulses for the generation of structures far below the classical optical diffraction limit of about 200 nanometers as well as coverage of state-of-the-art technical and biomedical applications. These applications include silicon and glass wafer processing, production of nanowires, laser transfection and cell reprogramming, optical cleaning, surface treatments of implants, nanowires, 3D nanoprinting, STED lithography, friction modification, and integrated optics. The book highlights also the use of modern femtosecond laser microscopes and nanoscopes as novel nanoprocessing tools.
Book Synopsis Ultrashort laser pulse measurement for multiphoton microscopy by : Ivan Amat-Roldan
Download or read book Ultrashort laser pulse measurement for multiphoton microscopy written by Ivan Amat-Roldan and published by . This book was released on 2014 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we address specific efforts towards developing the precise aspect of ultrashort laser pulse measurement in the context of biomedical research. The motivation for pursuing these new developments was triggered by the vision of developing fundamental tools that will enable to control matter by means of light with exquisite precision with the added difficulty of being next to biological samples which are extremely sensitive and fragile. For this, light matter interaction needs to be extremely well controlled to avoid undesired effects, like cell damage due to the high peak intensity values of ultrashort laser pulses, as well as promoting specific physical processes like two-photon fluorescence excitation of a desired fluorophore embedded in some biochemical environment. We focus in the two major bottlenecks regarding ultrashort laser pulse measurements for multiphoton microscopy, that aim for developing (1) new techniques for full characterization of ultrashort pulses under different experimental conditions and (2) new material with specific nonlinear properties that enable to obtain ultrashort pulse measurements that properly catch the temporal shape of light and at the same time can be readily found in biomedical lab, specially cost effective, non fragile and non-toxic. Combination of these two complementary strategies provides a new ground where it is possible to characterise an ultrashort pulse at the sample plane of a multiphoton microscope in a regular biomedical research facility. Importantly, we approach ultrashort pulse characterisation by developing a different theoretical framework to the state-of-the-art and we propose few initial experiments that preliminary support our theoretical statements in the form of new optical techniques. These findings are then experimentally tested under different conditions, such different optical setups and different pulsed regimes in order to evaluate the feasibility of the tools to measure ultrashort pulses in conditions that were prohibitive at the time this thesis was started. The scope of this thesis outlines the potential of such techniques, but further efforts shall be addressed to assess feasibility, robustness and further limitations.
Book Synopsis The Characterization of Highly Intense, Ultrashort Laser Pulses by : Chester Anthony Murley
Download or read book The Characterization of Highly Intense, Ultrashort Laser Pulses written by Chester Anthony Murley and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
