Femtosecond time-resolved spectroscopy of energetic materials

Wakeham, Gregory P; Chung, Dutch D.; Nelson, Keith A.

doi:10.1016/s0040-6031(01)00774-2

Cited by 17 publications

(16 citation statements)

References 17 publications

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“…Finally, the method does not require tight control over the profile of the probe and pump beam (and a priori profiling of the latter), as is the case with "single-shot" methods based on spatial encoding. [2][3][4][5][6] In particular, the detection can be performed far from the sample, which makes it ideal for use in confined spaces. As for the spectral profile of the probe pulse, it should be reasonably close to a Gaussian; however, a "ripple" pattern with peakto-peak amplitude of 10-20% can still be tolerated (section III.2).…”

Section: Discussionmentioning

confidence: 99%

“…The spread of the delay times can be increased further out to 10-15 ps by passing the probe (and/or the pump) beam through an echelon 3.6 or a supersonic beam. 8 Transient absorption, 2,4,5,6 stimulated emission, 3 and grating 5 measurements on picosecond (ps) 2,3 and femtosecond (fs) 4.5 time scales have been carried out in this manner. A more sophisticated version of the same technique employs two crossed echelons to generate a 2D train of probe pulses separated by 30 fs in time that extends out to 10 ps; a CCD is used to analyze the resulting 2D pattern.…”

Section: Introductionmentioning

confidence: 99%

“…A more sophisticated version of the same technique employs two crossed echelons to generate a 2D train of probe pulses separated by 30 fs in time that extends out to 10 ps; a CCD is used to analyze the resulting 2D pattern. 6 While spatial encoding may work for some applications, there are several drawbacks that make this technique unsuitable for time resolved radiation chemistry:…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Frequency-domain “single-shot” ultrafast transient absorption spectroscopy using chirped laser pulses

Shkrob

Oulianov

Crowell

et al. 2004

Journal of Applied Physics

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Single-shot ultrafast absorbance spectroscopy based on the frequency encoding of the kinetics is analyzed theoretically and implemented experimentally. The kinetics are sampled in the frequency domain using linearly chirped, amplified 33 fs FWHM pulses derived from a Ti:sapphire laser. A variable length grating pair compressor is used to achieve the time resolution of 500-1000 channels per a 2-to-160 ps window with sensitivity > 5x10 -4 . In terms of the acquisition time, FDSS has an advantage over the pump-probe spectroscopy in a situation when the "noise" is dominated by amplitude variations of the signal, due to the pump and flow instabilities. The possibilities of FDSS are illustrated with the kinetics obtained in multiphoton ionization of water and aqueous iodide and one-photon excitation of polycrystalline ZnSe and thin-film amorphous Si:H. Unlike other "single-shot" techniques, FDSS can be implemented for fluid samples flowing in a high-speed jet and for thin solid samples that exhibit interference fringes; no a priori knowledge of the excitation profile of the pump across the beam is needed.Another advantage is that due to the interference of quasimonochromatic components of the chirped probe pulse, an oscillation pattern near the origin of the FDSS kinetics emerges. This pattern is unique and can be used to determine the complex dielectric function of the photogenerated species.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency-domain “single-shot” ultrafast transient absorption spectroscopy using chirped laser pulses

Shkrob

Oulianov

Crowell

et al. 2004

Journal of Applied Physics

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“…To measure ultrafast transient signals in single-shot events, various single-shot spectroscopic techniques have been proposed to date; [8][9][10][11] in these techniques, the probe pulses are designed to have a spatially encoded delay time. However, these techniques have some experimental limitations.…”

mentioning

confidence: 99%

Ultrafast crystalline-to-amorphous phase transition in Ge2Sb2Te5 chalcogenide alloy thin film using single-shot imaging spectroscopy

Takeda

Oba

Minami

et al. 2014

Applied Physics Letters

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We have observed an irreversible ultrafast crystalline-to-amorphous phase transition in Ge2Sb2Te5 chalcogenide alloy thin film using broadband single-shot imaging spectroscopy. The absorbance change that accompanied the ultrafast amorphization was measured via single-shot detection even for laser fluences above the critical value, where a permanent amorphized mark was formed. The observed rise time to reach the amorphization was found to be ∼130–200 fs, which was in good agreement with the half period of the A1 phonon frequency in the octahedral GeTe6 structure. This result strongly suggests that the ultrafast amorphization can be attributed to the rearrangement of Ge atoms from an octahedral structure to a tetrahedral structure. Finally, based on the dependence of the absorbance change on the laser fluence, the stability of the photoinduced amorphous phase is discussed.

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“…7 A more complicated example uses a pair of crossed stair-stepped transparent echelons in the probe beam to introduce delay to different portions of the probe beam. [8][9][10] These techniques emphasize high temporal resolution, but are only able to provide information within a few tens of picoseconds time window. A different type of single-shot method based on frequency encoding of temporal information has also been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Optical fiber-based single-shot picosecond transient absorption spectroscopy

Cook

Shen

2009

Review of Scientific Instruments

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A new type of single-shot transient absorption apparatus is described based on a bundle of optical fibers. The bundle contains 100 fibers of different lengths, each successively giving approximately 15 ps longer optical delay. Data are collected by imaging light from the exit of the bundle into a sample where it is overlapped with an electron pulse or laser excitation pulse, followed by imaging onto a charge coupled device (CCD) detector where the intensity of light from each fiber is measured simultaneously. Application to both ultrafast pump-probe spectroscopy and pulse radiolysis is demonstrated. For pulse radiolysis, the prototype bundle provides the ability to collect data with a time resolution limited only by the electron pulse width of 7-10 ps, over a total single-shot time window of approximately 1.5 ns. Tunable probe light is obtained from a titanium-sapphire laser and an optical parametric amplifier. Corrections are made to remove the fiber-to-fiber variations in signal magnitude due to the spatial overlap of the electron beam and probe image. High quality data can be collected over most of the sensitivity range of the CCD camera detectors. The single-shot instrument is valuable for measurement of samples that are only available in very limited quantities, are too viscous to flow, or are rigid. It is therefore excellent in applications, such as picosecond pulse radiolysis, where the thousands of pulses per kinetic trace typical in classical pump-probe experiments can damage the sample before useful results could be obtained.

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Femtosecond time-resolved spectroscopy of energetic materials

Cited by 17 publications

References 17 publications

Frequency-domain “single-shot” ultrafast transient absorption spectroscopy using chirped laser pulses

Frequency-domain “single-shot” ultrafast transient absorption spectroscopy using chirped laser pulses

Ultrafast crystalline-to-amorphous phase transition in Ge2Sb2Te5 chalcogenide alloy thin film using single-shot imaging spectroscopy

Optical fiber-based single-shot picosecond transient absorption spectroscopy

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