Formation of aggregate color centers under the action of femtosecond laser pulses
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A complex study of primary and aggregate defects formation in LiF crystals under the action of femtosecond laser pulses is carried out. These processes were compared for nominally pure and dosimetric LiF crystals (LiF:Mg,Ti). Taking into account high concentration of generated electron-hole pairs, it is proposed that the formation of primary Frenkel defects as a result of direct electron-hole recombination is possible along with the excitonic mechanism. Subsequent processes of aggregation of primary defects with stable defects formation are similar to LiF coloration with X-rays and other types of radiation.Keywords:
Primary (astronomy)
Femtosecond spectral holography is a very important technique of femtosecond pulse shaping, which permits storage, recalling and processing of femtosecond pulse signals. Femtosecond spectral holography technique and new applications of femtosecond pulse shaping with space-time conversion in femtosecond chemistry are presented
Femtosecond pulse
Femtochemistry
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Even in this day of proliferation of widely tunable femtosecond laser sources, severe limitations exist when one tries to perform two color femtosecond experiments with two independently tunable femtosecond lasers, One can generate, by clever cavity manipulation, two perfectly synchronized femtosecond pulses, but with very limited tunability. On the other hand, commercially available systems deliver completely independent tunability over the entire tuning range, but with timing jitters in the range of 5-10 ps. Here, we have developed a novel scheme which allows true two color femtosecond experiments with independent tunability of the two lasers.
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Using plasmonic nanofocusing coupled with ultrafast femtosecond pulses, we perform spatio-temporal nonlinear optical imaging of graphene and MoSe2. We resolve for the first time the nanoscale heterogeneity in the few-femtosecond coherent dynamics in two-dimensional materials.
Ultrafast optics
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Femtosecond laser has attractive advantages and broad prospects for development due to its ultra-short time scale and ultra-high peak power density characteristics.In this paper,we review the working mechanisms of femtosecond laser interaction with biological tissues and intrduce the recent applications of femtosecond laser in biomedicine field.Finally,the prospect of femtosecond laser technology is discussed.
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A series of laboratory and full-scale experiments on the propagation of high-power terawatt radiation on the basis of a femtosecond stand of the IAO SB RAS have been carried out. The problem of the spreading of femtosecond pulses in air is considered. The results of the investigation of dispersion spreading of pulses of femtosecond duration are presented.
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Transient (computer programming)
Femtochemistry
Dynamics
Free carrier
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Current GPI status on femtosecond cameras and diffractometers research and development is overviewed. Discussed are the key components of the femtosecond diffractometer which is now under design. The first experimental prototype of 20 - 40 kV, femtosecond photoelectron diffractometer is computer designed, manufactured and tested.
Diffractometer
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Abstract Femtosecond laser fabrication has grown to be a major method of extreme manufacturing because of the extreme energy density and spatial and temporal scales of femtosecond lasers. The physical effects and the mechanism of interaction between femtosecond lasers and materials are distinct from those in traditional processes. The nonlinear and nonequilibrium effects of the interaction have given rise to new concepts, principles, and methods, such as femtosecond pulse durations are shorter than many physical/chemical characteristic times, which permits manipulating, adjusting, or interfering with electron dynamics. These new concepts and methods have broad application prospects in micro/nanofabrication, chemical synthesis, material processing, quantum control, and other related fields. This review discusses the cutting-edge theories, methods, measurements, and applications of femtosecond lasers to micro/nano-manufacturing. The key to future development of femtosecond laser manufacturing lies in revealing its fabrication mechanism from the electronic level and precisely regulating the electronic dynamics.
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A comparison of two femtosecond coherent anti-Stokes Raman scattering (CARS) thermometry techniques is presented. While similar accuracies can be obtained with each technique, the hybrid femtosecond/picosecond technique was found to be less complex.
Picosecond
Ultrafast optics
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