Observation of optical gain from NV − center in diamond by femtosecond transient absorption
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Single crystal diamonds with strong NV− luminescence were prepared by high-pressure high-temperature method and followed by electron irradiation and annealing process. The stimulated emission and gain characteristics of NV− diamond in femtosecond time scale are also studied using the transient absorption technique. Stimulated emission was observed at 660–800 nm, with an optical gain displayed in the range of 680–725 nm. Further test revealed that the optical gain lifetime is 3.5 ns and the gain coefficient is 0.16 cm−1, demonstrating the potential realization of color center lasers.Keywords:
Transient (computer programming)
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This chapter contains sections titled: Introduction Reaction Dynamics Time-Resolved Femtosecond Dynamics Coherence Representative Femtosecond Dynamics Studies Femtosecond Structural Determinations More Complex Reactions Conclusion and Outlook Suggested Reading References
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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
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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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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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Ti-plated diamond surface by molten salt was investigated.The phases of Ti-plating are TiC and Ti,and diamond-TiC-Ti structure model of Ti-plated diamond surface was established.The desquamating grade of diamond and the holding force coefficient between matrix and diamond were suggested as new concepts.A comparison of the diamond saw blade using ordinary diamond with that using Ti-plated diamond reveals that the desquamating grade of diamond reduces from 72.2% to 32.3%,representing a decrease of 39.9%;the holding force coefficient between matrix and diamond increases from 75.6% to 92.81%, an increase of 17.21%.
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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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