منابع مشابه
Modifications in Near-Surface Layer of Transparent Dielectrics Ionized by Ultrashort Laser Pulses
Formation of spatially non-uniform mechanical tension in a transparent solid due to the lattice ionization under the intensive ultrashort laser pulses action is predicted and theoretically described. Within the framework of the continual theory of elasticity the estimation of both average values of deformation tensor and its variations in solid dielectric with non-uniform random distribution of...
متن کاملTemporally focused femtosecond laser pulses for low numerical aperture micromachining through optically transparent materials
Temporal focusing of spatially chirped femtosecond laser pulses overcomes previous limitations for ablating high aspect ratio features with low numerical aperture (NA) beams. Simultaneous spatial and temporal focusing reduces nonlinear interactions, such as self-focusing, prior to the focal plane so that deep (approximately 1 mm) features with parallel sidewalls are ablated at high material rem...
متن کاملOptical shock and blow-up of ultrashort pulses in transparent media
P. Whalen,1 J. V. Moloney,2,3,4 A. C. Newell,3 K. Newell,3 and M. Kolesik2,4,5 1Program in Applied Mathematics, University of Arizona, Tucson, AZ 85721-0089, USA 2Arizona Center for Mathematical Sciences, University of Arizona, Tucson, AZ 85721-0089, USA 3Department of Mathematics, University of Arizona, Tucson, AZ 85721-0089, USA 4College of Optical Sciences, University of Arizona, Tucson, AZ ...
متن کاملSpatio-temporally focused femtosecond laser pulses for nonreciprocal writing in optically transparent materials.
Simultaneous spatial and temporal focusing (SSTF) provides precise control of the pulse front tilt (PFT) necessary to achieve nonreciprocal writing in glass wherein the material modification depends on the sample scanning direction with respect to the PFT. The PFT may be adjusted over several orders of magnitude. Using SSTF nonreciprocal writing is observed for a large range of axial focal posi...
متن کاملSelf-guided propagation of ultrashort laser pulses in the anomalous dispersion region of transparent solids: a new regime of filamentation.
We report measurements concerning the propagation of femtosecond laser pulses in fused silica with a wavelength at 1.9 μm falling in the negative group velocity dispersion region. Under sub-GW excitation power, stable filaments are observed over several cm showing the emergence of nonspreading pulses both in space and time. At higher excitation powers, one observes first multiple pulse splittin...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 1993
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.1910300419