Research of impact of the dispersion effect of the atmosphere on the duration of the femtosecond laser pulse
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One of the actual problems of the multi-frequency laser remote sensing is the using of the self-action phenomena of pulsed femtosecond laser radiation. When femtosecond laser radiation propagates in the atmosphere, both the transformation of the spectral and spatial characteristics of the radiation dispersion and the pulse duration occurs. The effect of atmospheric air dispersion on the duration of a femtosecond pulse propagating in the atmosphere is discussed via the results of experiments. The fact of compensating of the dispersion spreading of the pulse duration in air by its temporary "compression" under the influence of a change in the phase modulation index in an optically active impurity is not excluded.Keywords:
Pulse duration
Self-phase modulation
We present a method of adjusting the pulse duration and eliminating the pulse-front tilt of an ultrashort pulse in real time by use of a specially configured single-shot autocorrelator. Pulse-front tilt, or a temporal delay across the pulse front, is a common ultrashort-pulse phenomenon when dispersive elements are being used. We show the design of an autocorrelator that can be used to eliminate the pulse-front tilt and simultaneously adjust the pulse duration in real time by adjustment of the pulse compressor of a chirped-pulse amplified laser system.
Autocorrelator
Pulse duration
Prism compressor
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We have performed laboratory experiments to study long distance propagation of large bandwidth ultrashort laser pulses in air. Initial pulse length, frequency chirping, and laser pulse energy were varied where the maximum propagation distance was up to 105 m. We have demonstrated the compression of initially negatively chirped low intensity laser pulses due to the linear group velocity dispersion of air. The characteristics of the compressed pulse such as pulse duration and spectral chirping were found to be significantly affected by the laser pulse intensity, with higher intensities corresponding to longer minimum compressed pulse duration.
Chirp
Prism compressor
Pulse duration
Pulse compression
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The effect of pulse width on propagation characteristics of the femtosecond ultrashort laser pulse in V-type three-level atomic media with different densities is investigated by using the numerical solution,which is obtained by PC-FDTD method for the full Maxwell-Bloch equation.It is shown that the effect of the pulse width on propagation characteristics of the pulse is different for different atomic density cases.When the ultrashort pulse propagates in the dilute medium with smaller atomic density,the pulse is not easy to split.When the pulse doesn't split,the pulse amplitude will decrease obviously with the pulse width increasing.When the ultrashort pulse propagates in the medium with very large atomic density,the pulse is easy to split,and the number of sub-pulses increases with the pulse width increasing Moreover the increase of the pulse width accelerates the pulse splitting.
Ultrashort pulse laser
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Pulse compression
Frequency-resolved optical gating
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The pulse-duration compression principle of a ultra-short laser pulse by cascaded second-order nonlinearity from a single β-barium borate(BBO) crystal was studied theoretically and experimentally.By using the split-step Fourier transformation and fourth-order Runge-Kutta methods,the type I coupled wave equations describing for Second Harmonic Generation(SHG) process of femtosecond pulse were simulated and calculated.The influences of the phase mismatch between fundamental harmonic(FH) and second harmonic(SH) pulses,the length of nonlinear crystal,peak intensity and the initial pulse-duration of the FH pulse on the pulse-duration compression were analyzed quantitatively and the experimental parameters were also optimized.Furthermore,the experiment of the pulse-width compression was performed for the ultra-short laser pulse with a center wavelength of 800 nm and a pulse width of 140 fs,and the pulse-width compression of more than two times was achieved.Finally,the experimental and simulation results for different fundamental peak intensities and initial pulse-widths were compared.Obtained results show that some factors like the phase mismatch between fundamental harmonic(FH) and second harmonic(SH) pulses,peak intensity,pulse chirp and the initial pulse-duration of the FH pulse have much influence on the pulse compression,so these facts mentioned above should be taken into consideration.
Pulse duration
Barium borate
Pulse compression
Chirp
Harmonic
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The self-focusing properties of the femtosecond pulse were analyzed through numerical calculation using modified Schr-dinger equation. On the basis of the analysis, the self-focusing properties of the chirped Gaussian pulse in the chirped pulse amplification (CPA) system were analyzed and discussed, and the numerical calculations were performed. The results showed that the effect of group velocity dispersion(GVD) on the pulse with large chip was slight and the effect of spectral width on the self-focusing properties could be ignored. Consequently, the self-focusing properties of the pulse with large chirp in the nonlinear medium with normal dispersion were different from those of femtosecond pulse, but similar to those of nanosecond pulse.
Chirp
Self-phase modulation
Nanosecond
Femtosecond pulse
Chirped pulse amplification
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In this paper, we analyze transmission characteristics of ultrashort laser pulses using the properties of high-order pulses which are systematically obtained following their orders. The high-order pulses are easily derived from a modified PRS system model. But we make clear they are very useful to cover wider area and to show more accurate transmission characteristics of ultrashort pulses than Gaussian or Sech pulse approximations used conventionally. These are based on the fact that the spectra and bandwidths of the high-order pulses are geautifully related to their orders. First modifying the generalized PRS system model, we propose a new model for deriving any type of high-order pulse. And we offer a novel analysis method of ultrashort pulse transmission varying the order of the pulse from n=1 to n=100, we obtain spectra of ultrashort pulses with 1(ps)∼150(fs) FWHM's, which are widely used in optical pulse communications. One-step further, we derive PSD's of their pulse-tr ins when they are applied to Unipolar signaling scheme. These PSD's are decided in the range of possible pulse intervals. All of these results are not only coincided with some conventional experimental works but will be applied to any pioneering ultrashort pulse in the future.
Ultrashort pulse laser
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Recent progress in all-normal dispersion fiber laser design indicates these sources will be capable of producing intense ultrashort pulses. Experimental delivery of 10's of nanoJoules compressed to sub-45 fs pulse duration will be presented.
Pulse duration
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Summary form only given. There has been considerable interest recently in femtosecond pulse shaping techniques in which a single ultrashort pulse is converted into a tailored optical wave form. In this presentation, we present recent results of our continued efforts in femtosecond pulse shaping and its application to multiple-pulse spectroscopy and optical control over material responses.
Femtosecond pulse
Prism compressor
Femtochemistry
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Frequency-resolved optical gating
Picosecond
Ultrashort pulse laser
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