Harmonic Generation of Microwave Phonons by Radiation Pressure and by the Phonon Phonon Interaction PDF Download
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Author: Paul H. Carr
Publisher:
ISBN:
Category : Microwaves
Languages : en
Pages : 16
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Author: Paul H. Carr
Publisher:
ISBN:
Category : Microwaves
Languages : en
Pages : 16
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Author: Paul Henry Carr
Publisher:
ISBN:
Category : Acoustics
Languages : en
Pages : 114
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Book Description
The ability to produce coherent phonons of microwave frequency provides a much needed means of investigating fundamental phenomena in solid state physics at frequencies never before attained. It is shown for the first time that second and third harmonics of the fundamental acoustic wave are also generated. The fact that the secondharmonic acoustic power was observed to be proportional to the square of the fundamental and the third-harmonic acoustic power proportional to the cube of the fundamental establishes the nonlinearity of the generation mechanism. Second-harmonic generation of longitudinal phonons in nonpiezoelectric Z-cut quartz was observed. The generation mechanism is common to all dielectric media. This demonstrates that coherent phonon generation is not restricted to relatively rare piezoelectric materials. The highest frequency at which microwave phonons can be generated is limited to 80 Gcps by present-day highpower microwave sources. The successful generation of harmonics of microwave phonons enhances the possibility of extending the present limit well into the millimeter range. Fundamental research of this type can lead to such practical control devices as microwave delay lines since the acoustic delay time of one centimeter of quartz is the same as that of 500 meters of waveguide. (Author).
Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 784
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 568
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Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
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Category : Geophysics
Languages : en
Pages : 350
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Author: Lihong V. Wang
Publisher: CRC Press
ISBN: 1351834983
Category : Science
Languages : en
Pages : 1027
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Book Description
Photoacoustics promises to revolutionize medical imaging and may well make as dramatic a contribution to modern medicine as the discovery of the x-ray itself once did. Combining electromagnetic and ultrasonic waves synergistically, photoacoustics can provide deep speckle-free imaging with high electromagnetic contrast at high ultrasonic resolution and without any health risk. While photoacoustic imaging is probably the fastest growing biomedical imaging technology, this book is the first comprehensive volume in this emerging field covering both the physics and the remarkable noninvasive applications that are changing diagnostic medicine. Bringing together the leading pioneers in this field to write about their own work, Photoacoustic Imaging and Spectroscopy is the first to provide a full account of the latest research and developing applications in the area of biomedical photoacoustics. Photoacoustics can provide functional sensing of physiological parameters such as the oxygen saturation of hemoglobin. It can also provide high-contrast functional imaging of angiogenesis and hypermetabolism in tumors in vivo. Discussing these remarkable noninvasive applications and so much more, this reference is essential reading for all researchers in medical imaging and those clinicians working at the cutting-edge of modern biotechnology to develop diagnostic techniques that can save many lives and just as importantly do no harm.
Author:
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Category : Government publications
Languages : en
Pages : 1234
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Author:
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ISBN:
Category : Technology
Languages : en
Pages : 1090
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Author:
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 20
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Author: United States. Air Force. Office of Aerospace Research
Publisher:
ISBN:
Category :
Languages : en
Pages : 682
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