Wavelength conversion of quadrupled Nd:YAG laser radiation to the vacuum ultraviolet by anti-Stokes stimulated Raman scattering

Moriwaki, Hiroki; Wada, Satoshi; Tashiro, Hideo; Toyoda, K.; Kasai, Atsushi; Nakamura, Akira

doi:10.1063/1.354751

Cited by 27 publications

(8 citation statements)

References 8 publications

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“…The pump laser focused in the middle of the cell generates stimulated Stokes beams to several orders of magnitude at a frequency shifted according to the gas employed, and the Stokes beams wave mix with the pump laser to produce coherent anti-Stokes Raman scattering (CARS) beams at a variety of anti-Stokes orders [31]. The stimulated Raman frequency converter has been used for frequency upconversion of pump laser radiation to the vacuum ultraviolet [32,33] and also as a light source for EEM fluorometry analysis of soil contamination [34,35].…”

Section: Experimental Set-upmentioning

confidence: 99%

Investigation of early soot formation process in a diesel spray flame via excitation—emission matrix using a multi-wavelength laser source

Aizawa

Kosaka

2008

International Journal of Engine Research

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In order to investigate the early soot formation processes in diesel combustion, spectral analysis of polycyclic aromatic hydrocarbons (PAHs) formed in the early soot formation region in a diesel spray flame was conducted via the excitation—emission matrix (EEM) technique using a multi-wavelength laser source. The experiments were conducted using an optically accessible constant volume combustion vessel under diesel-like conditions (ambient temperature, Ta = 750–1130 K and ambient pressure, Pa = 2.0–3.0 MPa) at different ambient oxygen concentrations (10–21 per cent). The PAHs formed in a diesel spray flame in the combustion vessel were excited by a coherent multi-wavelength ‘rainbow’ laser light (mainly 266, 299, 342, and 398 nm, total 20 mJ) generated by converting the fourth harmonic (266 nm, 60 mJ) of a pulsed neodymium-doped yttrium aluminium garnet (Nd:YAG) laser using a Raman cell frequency converter filled with hydrogen (500 kPa). The spectra of laser-induced fluorescence from the PAHs excited by the different laser wavelengths in the flame were simultaneously captured with a spectrometer and an intensified charge-coupled device (ICCD) camera as EEM images. The EEM measured in diesel spray flames at different ambient temperatures and oxygen concentrations revealed that the timing and the region for PAH growth and soot particle formation are delayed and extended downstream at lower ambient temperatures and oxygen concentrations. At an ambient temperature of 940 K and an ambient oxygen concentration of 21 per cent, a variety of PAHs are detected around the ignition timing in the central region of the diesel spray flame and the PAHs grow into larger PAHs and soot particles as the combustion process progresses. At a lower ambient temperature of 750 K or lower ambient oxygen concentrations down to 10 per cent, the fluorescence from PAHs is detected in the central region of the diesel spray flame before the ignition timing and the intensity and the spectral characteristics of the PAH fluorescence do not change for a longer period until they are finally converted to soot particles in the downstream regions in the spray flame.

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Section: Experimental Set-upmentioning

confidence: 99%

Investigation of early soot formation process in a diesel spray flame via excitation—emission matrix using a multi-wavelength laser source

Aizawa

Kosaka

2008

International Journal of Engine Research

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“…For example, the energy of the AS9 pulses by ASRS with seed was 4 times larger than that reported in ref. 13. And it should be also remained that AS 10 and AS 1 1 pulses appeared obtainable only under the injection enhancement.…”

Section: Resultsmentioning

confidence: 90%

“…Experimental setup for the generation of anti-Stokes pulses with pulse seeding.Since detailed procedures of measurements for energies and beam profiles of VUV pulses have been already described in ref 13,. only a brief explanation is presented.…”

mentioning

confidence: 99%

<title>High-order anti-Stokes stimulated Raman scattering with injection techniques</title>

et al. 1995

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We have investigated higher-order anti-Stokes Raman scattering with injection of Stokes or anti-Stokes pulses for the efficient generation of vacuum ultraviolet radiation. Spatial profiles of anti-Stokes pulses were modified and their energies were increased with injection of pulses with the wavelength of the first Stokes pulse to the pump pulse of the fourth harmonic of Nd:YAG laser. Enhancement factors become larger for the higher orders of anti-Stokes pulses. The shift of optimum pressure together with the change of profile from ring to Gaussian-like shape induced by injection explains that the enhancement effect is due to adjustment of phase matching condition for anti-Stokes generation.

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“…Hydrogen, which is currently used as a Raman medium, is transparent and the dispersion is small from the entire infrared/visible to the VUV region, and, as a result, it is possible to generate a tunable laser emission down to the deep-VUV region. 13 In this work, we investigate the approach of using SRS and FWRM for the efficient generation of a tunable VUV laser, and the application of this VUV source to excitation/ ionization in MPI/TOF-MS. Figure 1 shows the experimental apparatus for the generation and measurement of stimulated Raman emission using the second harmonic emission of an optical parametric oscillator ͑Spectra-Physics, MOPO-730, 250 nm, 10 mJ, 6 ns, 0.2 cm Ϫ1 ͒. The UV pump beam is focused onto a Raman cell, which consists of a stainless steel tube and two flanges with windows on both sides.…”

Section: Introductionmentioning

confidence: 99%

The generation of a tunable laser emission in the vacuum ultraviolet and its application to supersonic jet/multiphoton ionization mass spectrometry

Uchimura

Onoda

Lin

et al. 1999

Review of Scientific Instruments

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An optical parametric oscillator and a Ti:sapphire laser are used as a pump source for the generation of high-order vibrational stimulated Raman emission in the vacuum ultraviolet region. This tunable laser is employed as an excitation/ionization source in a supersonic jet/multiphoton ionization/ time-of-flight mass spectrometric study of benzene. The merits and potential advantages of this approach are discussed in this study.

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Wavelength conversion of quadrupled Nd:YAG laser radiation to the vacuum ultraviolet by anti-Stokes stimulated Raman scattering

Cited by 27 publications

References 8 publications

Investigation of early soot formation process in a diesel spray flame via excitation—emission matrix using a multi-wavelength laser source

Investigation of early soot formation process in a diesel spray flame via excitation—emission matrix using a multi-wavelength laser source

<title>High-order anti-Stokes stimulated Raman scattering with injection techniques</title>

The generation of a tunable laser emission in the vacuum ultraviolet and its application to supersonic jet/multiphoton ionization mass spectrometry

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