Subpicosecond stimulated Raman scattering in high-pressure hydrogen

Wang, J.-K.; Siegal, Y.; Lu, Chenqi; Mazur, Eric; Reintjes, J.

doi:10.1364/josab.11.001031

Cited by 22 publications

(5 citation statements)

References 9 publications

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“…It was observed that phenomena such as self-phase modulation and selffocusing can lower the eff iciency of SRS. 3 Because the pulse duration is much shorter than the dephasing time of the Raman polarizability, more pump energy is needed to reach the threshold of SRS. 1,5 In addition, because of the broad spectral width of the femtosecond pulses, group-velocity mismatch can reduce the effective interaction length of the pump and the Stokes pulses.…”

mentioning

confidence: 99%

Stimulated Raman amplification of femtosecond pulses in hydrogen gas

et al. 1996

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confidence: 99%

Stimulated Raman amplification of femtosecond pulses in hydrogen gas

et al. 1996

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“…They examined the pump energy and gas pressure dependences of the Stokes energy and clarified the effect of self-phase modulation and selffocusing on transient SRS. Wang et al 18 investigated SRS in H 2 gas using a Ti : sapphire laser with a pulse duration of 840 fs and achieved an efficiency of Á 1S D 17% in SRS conversion. It was found that the self-phase modulation and self-focusing were initiated at a laser power just above the threshold of SRS, having a significant influence on the scattering process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of stimulated Raman scattering of hydrogen and methane gases as a light source for picosecond time-resolved Raman spectroscopy

Uesugi

Mizutani

Kruglik

et al. 2000

J. Raman Spectrosc.

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Stimulated Raman scattering (SRS) in compressed hydrogen and methane gas was characterized in terms of pulse energy, temporal width and spectral width in the range of gas pressures 10-60 atm to use it as a light source for picosecond time-resolved resonance Raman spectroscopy. SRS was pumped by the second harmonic of a Ti : sapphire oscillator-regenerative amplifier laser system with pulse energy up to 200 µJ, duration ∼2.5 ps and repetition rate 1 kHz. The output spectral region 421-657 nm was covered by the first and second Stokes SRS components on tuning of the pump wavelength in the range 375-425 nm. Energy conversion to the first Stokes SRS component was more than 10% with H 2 and more than 20% with CH 4 . The temporal width of the SRS pulse (1.1-2.1 ps) was shorter than that of the pump pulse. The spectral band shape was found to be modulated, since the SRS is generated in a transient regime. When more than 100 pulses were averaged, the temporal and spectral profiles of SRS pulses were sufficiently smooth and energy fluctuations were sufficiently small for spectroscopic applications. On the basis of the results obtained, optimized conditions as a Raman shifter were deduced. The Raman shifter served as a light source for two-color pump-probe time-resolved resonance Raman (TR 3 ) experiments and to demonstrate its capabilities, picosecond TR 3 spectra of nickel tetraphenylporphyrin in toluene solution were measured.

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“…A drawback of the transient regime is, however, that the Raman gain depends not on the peak pulse intensity but on the integrated pump intensity (i.e., the pulse energy), which necessitates the use of high-energy ultrashort pulses [6]. This results in the emergence of detrimental competing effects such as ionization and self-phase modulation (SPM), which in a conventional gas cell (where the dispersion is normal) reduce the efficiency of Raman conversion [6,7]. One way to circumvent this problem is to use kagomé-style hollowcore photonic crystal fiber (kagomé-PCF) that guides light by an anti-resonant-reflection mechanism.…”

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Generation of three-octave-spanning transient Raman comb in hydrogen-filled hollow-core PCF

et al. 2015

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A noise-seeded transient comb of Raman sidebands spanning three octaves from 180 to 2400 nm, is generated by pumping a hydrogen-filled hollow-core photonic crystal fiber with 26-μJ, 300-fs pulses at 800 nm. The pump pulses are spectrally broadened by both Kerr and Raman-related self-phase modulation (SPM), and the broadening is then transferred to the Raman lines. In spite of the high intensity, and in contrast to bulk gas-cell based experiments, neither SPM broadening nor ionization are detrimental to comb formation.

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Subpicosecond stimulated Raman scattering in high-pressure hydrogen

Cited by 22 publications

References 9 publications

Stimulated Raman amplification of femtosecond pulses in hydrogen gas

Stimulated Raman amplification of femtosecond pulses in hydrogen gas

Characterization of stimulated Raman scattering of hydrogen and methane gases as a light source for picosecond time-resolved Raman spectroscopy

Generation of three-octave-spanning transient Raman comb in hydrogen-filled hollow-core PCF

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