Vacuum-ultraviolet stimulated emission generated via four-wave Raman mixing in molecular hydrogen

Phan, Thang Dinh; Vu, Duong; Imasaka, Totaro

doi:10.1007/s00340-019-7241-9

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…30 The third harmonic emission (133 nm, 9.3 eV) generated in a rare gas using the second harmonics (400 nm) of a Ti:sapphire laser (800 nm) would be preferred for more general use of this technique (although the selectivity would be decreased), the conversion efficiency of which would be significantly improved using a high-peak-power ultrashort laser pulse. In a previous study, we reported on the generation of a femtosecond VUV pulse at 154.2 nm and attributed this to stimulated emission in molecular hydrogen, which would be an alternative approach for use in SPI MS. 43…”

Section: Resultsmentioning

confidence: 99%

Single-Photon Ionization Mass Spectrometry Using a Vacuum Ultraviolet Femtosecond Laser

Phan

Nakamura

et al. 2020

J. Am. Soc. Mass Spectrom.

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The wavelength of a femtosecond Ti:sapphire laser (TS, 800 nm) was converted into the ultraviolet (UV, 200 nm) using three β-barium borate crystals (β-BaB 2 O 4 ) for frequency doubling and subsequent mixing. The UV pulse was further converted into the vacuum ultraviolet (VUV, 185 nm) based on four-wave Raman mixing, in which a two-color pump beam consisting of the fundamental beam (800 nm) of the TS and the signal beam of an optical parametric amplifier (1200 nm) pumped by the TS was focused onto a capillary waveguide filled with hydrogen gas for molecular phase modulation and the single-color UV probe beam (200 nm) was then focused onto the waveguide for frequency modulation to generate anti-Stokes and high-order Stokes Raman sidebands at wavelengths of 185 and 218−267 nm, respectively. The efficiency of conversion from the UV (200 nm) to the VUV (185 nm) was 6%. The ionization energy was calculated for 13 amino polycyclic aromatic hydrocarbons using density functional theory, since they are associated with the development of occupational bladder cancers. The values calculated by the B3LYP/cc-pVDZ and ωB97Xd/cc-pVTZ methods were 6.24−7.14 eV (199−174 nm) and 6.41−7.35 eV (194−169 nm), respectively. A sample containing a mixture of 9-aminoanthracene, 3-aminofluoranthene, and 1-aminopyrene was separated by gas chromatography (GC), and the eluents were ionized with the VUV pulse (0.015 μJ) in mass spectrometry (MS). The analytes were observed on a two-dimensional display of GC/MS, and the detection limit obtained by single-photon ionization of 3-aminofluoranthene was 1 ng/μL.

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Section: Resultsmentioning

confidence: 99%

Single-Photon Ionization Mass Spectrometry Using a Vacuum Ultraviolet Femtosecond Laser

Phan

Nakamura

et al. 2020

J. Am. Soc. Mass Spectrom.

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RETRACTED ARTICLE: Sub-2-fs ultrashort optical pulses characterized by spectral phase interferometry for direct electric-field reconstruction

Zhang

2022

J Opt

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Generation of sub-half-cycle 10 µm pulses through filamentation at kilohertz repetition rates

Huang¹,

Zhao²,

Kusama³

et al. 2020

Opt. Express

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We have experimentally demonstrated the generation of sub-half-cycle phase-stable pulses with the carrier wavelength of 10.2 µm through two-color filamentation in nitrogen. The carrier-envelope phase (CEP) of the MIR pulse is passively stabilized and controlled by the attosecond time delay between the two-color input pulses. The duration of the MIR pulse is 13.7 fs, which corresponds to 0.402 cycles. The absolute value of the CEP of the generated sub-half-cycle pulse is consistent with a simple four-wave difference frequency generation model. We have also found that the 10 kHz repetition rate of the light source causes the fluctuation of the pulse energy on a few hundred millisecond time scale.

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Vacuum-ultraviolet stimulated emission generated via four-wave Raman mixing in molecular hydrogen

Cited by 3 publications

References 19 publications

Single-Photon Ionization Mass Spectrometry Using a Vacuum Ultraviolet Femtosecond Laser

Single-Photon Ionization Mass Spectrometry Using a Vacuum Ultraviolet Femtosecond Laser

RETRACTED ARTICLE: Sub-2-fs ultrashort optical pulses characterized by spectral phase interferometry for direct electric-field reconstruction

Generation of sub-half-cycle 10 µm pulses through filamentation at kilohertz repetition rates

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