Spectroscopy of short, intense laser pulses due to gas ionization effects

Rau, B.; Siders, C. W.; Blanc, Sylvie; Fisher, D.; Downer, Michael; Tajima, T.

doi:10.1364/josab.14.000643

Cited by 15 publications

(4 citation statements)

References 12 publications

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“…Chirp has also been shown to affect ionization. 17 The unchirped growth rate has been calculated previously in Refs. 18 -20 to be ␥ 0 ϭ(k e c/2&)( e / 0 )a 0 for Raman forward scattering ͑RFS͒ and ␥ 0 ϭk e c/4( e /ͱ e 0 )a 0 for Raman backward scattering ͑RBS͒, where k e ϭ e /c and a 0 ϭe͉A͉/mc 2 are the laser pulse's wave number and normalized vector potential.…”

mentioning

confidence: 99%

Coherent control of stimulated Raman scattering using chirped laser pulses

Dodd

Umstadter

2001

Physics of Plasmas

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A novel method for the control of stimulated Raman scattering and hot electron production in short-pulse laser-plasma interactions is proposed. It relies on the use of a linear frequency chirp in nonbandwidth limited pulses. Theoretical calculations show that a 12% bandwidth will eliminate Raman forward scattering for a plasma density that is 1% of the critical density. The predicted changes to the growth rate are confirmed in two-dimensional particle-in-cell simulations. Relevance to areas of current research is also discussed.

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mentioning

confidence: 99%

Coherent control of stimulated Raman scattering using chirped laser pulses

Dodd

Umstadter

2001

Physics of Plasmas

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“…The blue shifting of spectrum is due to the rapid changing of refractive index of the laser created plasma [5][6][7][8][9]. When a laser pulse is propagating in a media with rapid refractive index changing, the frequency change with…”

Section: Laser-helium Gas Jet Interactionmentioning

confidence: 99%

Self-phase modulation of an ultra-short laser pulse from laser breakdown plasma

et al. 2007

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The detailed dynamic of an atom in a laser field with strength comparable to the atomic electric field is rich in physics and potential applications. Laser-breakdown plasma-induced spectral shifting in supersonic rare gases jet has been investigated with a sub-picosecond KrF excimer laser focused to peak intensity in the region of 10 15 W/cm 2 . A 1.4mm diameter gas jet target was used in the experiment to minimize the refraction of the laser beam and thus a well-defined focused region was obtained. The typical quasi-periodic spectral shifting structures for helium and argon have been measured at various gas densities. For gas densities below 1×10 20 cm -3 ,both spectral red-shift and blue-shift were observed, indicating the gas is partially ionized, in contrast to the predominantly blue shifted as the gas densities grows high and fully ionized. Compared to the other ultra-short pulse measurement methods, qualitative information about the pulse can be deduced by observing their spectrum after interacting with rare gas.

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“…As the detailed structure of the ionization-front blue-shifted spectra depends on a complicated interplay of the input pulse structure (i.e. its temporal phase), the ionization dynamics [30], and cross-phase modulation in the neutral gas, the conclusions made from these experiments have been at best well-thought-out and limited inferences.…”

Section: Ultrafast Ionization In Gasesmentioning

confidence: 99%

“…24.6 allow both centroid-based power spectrum analysis and interferogram analysis, which provide a pulse-width averaged measure offrequency and phase shift, respectively. They can depend sensitively [1,30] on the detailed temporal and frequency-domain structure of the probe pulse. As MI-FROG recovers, to all orders, the phase difference between the pumped and unpumped probe pulses, we can utilize it to a) verify the intensity and phase structure of the probe pulse and b) recover the subpulsewidth time-resolved phase and frequency shifts impressed upon the probe by the pump pulse and ionization front, independently of the probe pulse structure.…”

Section: Ultrafast Ionization In Gasesmentioning

confidence: 99%

Multi-pulse Interferometric FROG

Siders¹,

Taylor²

2000

Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses

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By now you're well aware that in just ten years the measurement of ultrashort light pulses has advanced from practically impossible to nearly indispensable. FROG and related techniques see daily use in labs around the world. Moreover, FROG's self-consistency checks have firmly established it as the gold standard of pulse measurement. In addition, a rarely touted feature of FROG is that it is a type of ultrafast BOXCAR integrator, gating only the pulse and not undesired cw backgrounds. Indeed, if your goal is to characterize a pulse, FROG is undoubtedly the right choice.However, if your aim is to characterize the interaction of a light pulse with something else, e.g., in a pump-probe experiment where you want to time-resolve the optical properties of a laser-excited material, then FROG (or any other self-gating technique) may actually be a poor choice. For example, imagine placing in a beam a I-cm thick piece of fused silica, which only negligibly distorts a 30-fs 800-nm pulse. As a result, the FROG trace of this pulse will be unaltered. However, relative to propagation in air, the pulse is delayed by some 15 ps in time and nearly 6000 wavelengths in phase! Because FROG doesn't measure the zeroth-and first-order spectral phase terms, it doesn't see these effects. Usually this is desirable, but occasionally it isn't. Spectral interferometry (SI) does see these terms, but SI signals are often obscured due to SI's inability to gate a weak signal out from a cw background. As we shall show in this chapter, one can combine the advantages of both FROG and SI by using what we call Multi-pulse Interferometric FROG, or MI-FROG. Before delving into the details of MI-FROG, let's first look at some of the available techniques for materials studies, namely the inter-related techniques of spectral blue-shifting [I], spectral interferometry (SI [2-4]), and FROG [5], and its variants TREEFROG [6] and TADPOLE [7]). Each of these has been successfully used to extract from spectral power density measurements details of ultrafast phase distortions. The first two of these techniques, being linearoptical effects, are powerful tools for measuring constant (or "DC") and slowly varying time-domain phase distortions with extremely high, milliradian, sensitivity. On the other hand, the optically nonlinear FROG accurately recovers only nonlinear variations in spectral phase of an optical pulse and is oblivious to DC and slowly varying terms. Thus FROG provides a complementary diagnostic, yielding only the higher-order phase distortions. One way to combine the advantages of FROG and SI, called TADPOLE [7] and discussed in the previous two chapters, utilizes the time-domain intensity and phase extracted from a standard FROG apparatus to fully deconvolve the frequency-domain

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Spectroscopy of short, intense laser pulses due to gas ionization effects

Cited by 15 publications

References 12 publications

Coherent control of stimulated Raman scattering using chirped laser pulses

Coherent control of stimulated Raman scattering using chirped laser pulses

Self-phase modulation of an ultra-short laser pulse from laser breakdown plasma

Multi-pulse Interferometric FROG

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