Generation and Spectroscopic Applications of Coherent Extreme Ultraviolet (XUV) Radiation PDF Download

Author: Frederic Merkt
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Pierre Jaeglé
Publisher: Springer
ISBN: 0387299904
Category : Science
Languages : en
Pages : 414

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Extreme ultraviolet radiation, also referred to as soft X-rays or XUV, offers very special optical properties. The X-UV refractive index of matter is such that normal reflection cannot take place on polished surfaces whereas beam transmission through one micrometer of almost all materials reduces to zero. Therefore, it has long been a difficult task to imagine and to implement devices designed for complex optics experiments in this wavelength range. Thanks to new sources of coherent radiation - XUV-lasers and High Order Harmonics - the use of XUV radiation, for interferometry, holography, diffractive optics, non-linear radiation-matter interaction, time-resolved study of fast and ultrafast phenomena and many other applications, including medical sciences, is ubiquitous.

Author: Hoang Vu Le
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659749360
Category :
Languages : en
Pages : 136

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High harmonic generation featuring ultra-short pulses, short wavelengths and highly coherent radiation in a table-top setup has become one of the most versatile and affordable tools for studies of atomic and molecular dynamics as well as for nano-scale coherent diffractive imaging. In this book, we show the background and technical aspects of the generation and enhancement of high order harmonic radiations down to the water window region (2.3 - 4.4 nm). The source is specifically tailored and developed for imaging applications. By controlling and stabilizing the phase-matching condition in a gas cell, an extreme ultra-violet source which satisfies these requirements has been generated. Using a harmonic source with wavelengths around 30 nm, a resolution of 45 nm for a micrometer-size transmission sample has been obtained and biological-like absorption samples are also successfully reconstructed. A phase retrieval algorithm with a phase-curvature correction is developed to take advantage of the higher photon flux when placing the sample near the focus point.

Author: Meng Yijian
Publisher:
ISBN:
Category : Harmonics (Electric waves)
Languages : en
Pages :

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We demonstrate hyperspectral imaging using two time-delayed, coherent extreme ultraviolet (XUV) sources. The approach combines broadband XUV high-harmonic generation, holographic imaging, and Fourier transform spectroscopy. The two harmonics sources are spatially separated at generation, and overlap in the far field resulting in a double slit diffraction pattern. We record the two-dimensional intensity modulation as a function of relative time delay; the Fourier transform determines the spatially dependent spectrum. To reduce the delay jitter and improve the spectral resolution, we demonstrate a novel experimental setup that records the relative delay of the two pulses through optical interference. Moreover, we have demonstrated that this broadband approach can be extended to Fourier transform holographic imaging, which avoids extensive phase retrieval computations. Applications include imaging of biological materials near the carbon K-edge.

Author: Michael Werner Zürch
Publisher: Springer
ISBN: 3319123882
Category : Science
Languages : en
Pages : 139

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This thesis describes novel approaches and implementation of high-resolution microscopy in the extreme ultraviolet light regime. Using coherent ultrafast laser-generated short wavelength radiation for illuminating samples allows imaging beyond the resolution of visible-light microscopes. Michael Zürch gives a comprehensive overview of the fundamentals and techniques involved, starting from the laser-based frequency conversion scheme and its technical implementation as well as general considerations of diffraction-based imaging at nanoscopic spatial resolution. Experiments on digital in-line holography and coherent diffraction imaging of artificial and biologic specimens are demonstrated and discussed in this book. In the field of biologic imaging, a novel award-winning cell classification scheme and its first experimental application for identifying breast cancer cells are introduced. Finally, this book presents a newly developed technique of generating structured illumination by means of so-called optical vortex beams in the extreme ultraviolet regime and proposes its general usability for super-resolution imaging.

Author: Kwei-Sun Hsu
Publisher:
ISBN:
Category : Laser beams
Languages : en
Pages : 192

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Author: Charles K. Rhodes
Publisher:
ISBN:
Category :
Languages : en
Pages : 129

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The goal of this research program is the development of coherent X-ray sources is the kilovolt range. An initial application of short wavelength radiation in the vacuum ultraviolet region for photoemission studies of GaHz surfaces has been performed demonstrating the feasibility of this class of experiments. A basic and long-standing problem in the field of coherent sources is that associated with the generation of coherent energy in the extreme ultraviolet and soft x-ray regions. During the last three years, picosecond rare gas halogen (RGH) excimert laser technology, on account of the very favorable scaling relationships governing the spectral brightness of these sources, has emerged as a key factor in new techniques useful for generation of coherent radiation below 100 nm. The operation of RGH systems will be extended down into the femtosecond region, a development that will enable sources with peak powers P in the 1TW

Author: Prabhakar Misra
Publisher: CRC Press
ISBN: 0824744063
Category : Science
Languages : en
Pages : 572

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This volume presents a complete and thorough examination of advances in the instrumentation, evaluation, and implementation of UV technology for reliable and efficient data acquisition and analysis. It provides real-world applications in expanding fields such as chemical physics, plasma science, photolithography, laser spectroscopy, astronomy and atmospheric science.

Author: Charles K. Rhodes
Publisher:
ISBN:
Category :
Languages : en
Pages : 69

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High spectral brightness rare gas halogen (RGH) sources can be used to generate coherent extreme ultraviolet radiation by either harmonic generation mechanisms or direct multiquantum excitation of appropriate gain media. In order to demonstrate the basic characteristics of these two approaches, recent comparative measurements have been made. With the use of a 4 GW 193 nm (ArF*) system operating at a pulse duration of 10 ps, harmonic generation has been studied in several atomic and molecular media and used to generate 20 kW at 64.3 nm and 200 W at 38.6 nm. In addition, stimulated emission in molecular hydrogen on both the Lyman and Werner bands excited by two quantum absorption at 193 nm, has resulted in the generation of radiation as short as 117.6 nm at an efficiency of conversion approaching one percent. It has been concluded that the latter method is superior for the generation of short wavelength radiation. Extension of these results to both shorter wavelengths and higher power levels requires the ultraviolet. Recent studies of collision-free multiply-charged ion production with irradiation at 193 nm point to an anomalously strong coupling to high Z materials with processes involving as many as 99 quanta being observed. These multiquantum processes in the 40 - 80 eV rane in certain atomic systems can be generated with existing laser instrumentation. (Author).

Author: Triveni Srinivasan
Publisher:
ISBN:
Category :
Languages : en
Pages : 218

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