Pulse-duration compression of ultra-short laser pulse by cascaded second-order nonlinearity
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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.Keywords:
Pulse duration
Barium borate
Pulse compression
Chirp
Harmonic
We investigate the propagation of 20 fs pulses through a generalized pulse shaper/compressor and synthesize shaped waveforms with 20 fs features by linear spectral filtering using a generalized pulse shaper consisting of gratings and reflective optics. The use of reflective optics in the pulse shaper avoids cubic phase dispersion associated with lenses which significantly broaden short 20 fs pulses. As an example of our pulse-shaping capabilities, we generate pulse trains with repetition rates in excess of 12 THz using phase-only filtering.
Prism compressor
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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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Summary form only given. We have demonstrated generation of a temporally reversed femtosecond pulse inside chirped pulse system. Frequency chirping in an input pulse due to unknown group velocity dispersion is converted to opposite frequency chirping by this scheme. This opposite chirped pulse, a frequency domain phase conjugation pulse, reconstructs the initial phase structure after propagating through the same dispersion medium. We can automatically compensate phase distortion of an ultrashort and/or ultrabroadband light pulse.
Chirp
Phase distortion
Prism compressor
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We experimentally demonstrated accurate pulse shaping for ultrashort pulses through a regenerative amplifier by adaptively control both phase and amplitude of spectral component of seed pulses with an acousto-optic programmable dispersion filter (AOPDF).
Frequency-resolved optical gating
Optical parametric amplifier
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Generation of ultrashort, transform-limited pulses in a laser resonator by means of nonlinear pulse amplification and compression is observed both numerically and experimentally; this constitutes another type of pulse shaping mechanism in the mode-locked lasers. It is shown that as a result of nonlinear pulse compression, mode-locked pulse with pulse width beyond the gain bandwidth limitation could be directly generated in a laser.
Pulse compression
Prism compressor
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Q-switching
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To date most ultrashort optical pulses have been generated in the visible spectrum.1–3 The pulse widths in the near IR from neodymium laser systems at 1.06 μm are much longer. Even after two stages of pulse compression, the shortest pulse width generated at 1.06 μm is still only 200 fs.4 The problem with previous short pulse laser systems operating at 1.06 μm is that the pulse energy is limited by the stimulated Raman scattering in the optical fiber to ~20 nJ.5 This low pulse energy is not high enough to generate sufficient self-phase modulation to compress a pulse shorter than 200 fs.4
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Q-switching
Self-phase modulation
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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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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
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Femtochemistry
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Frequency-resolved optical gating
Picosecond
Ultrashort pulse laser
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