The search for a molecule to measure an autocorrelation trace of the second/third harmonic emission of a Ti:sapphire laser based on two-photon resonant excitation and subsequent one-photon ionization

Imasaka, Tomoko; Okuno, Tomoya

doi:10.1007/s00340-013-5505-3

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…A basic operation principle of the CPFWRM is similar to that of chirped-pulse coherent anti-Stokes Raman scattering (CPCARS) spectroscopy and is reported elsewhere [25,26]. The parameters for a chirped pulse can be briefly summarized as follows [29,30]. The electric field in the time (t) domain can be written as e E ¼ E 0 e Àat 2 e iðxtÀ/Þ when it is assumed to have a Gaussian profile, where E 0 is the amplitude, Dt = ffiffiffiffiffiffiffiffiffiffi ffi 2 ln 2 p = ffiffi ffi a p is the pulse width, x is a carrier frequency, and / = -bt 2 is the phase and b is the chirp parameter.…”

Section: Chirp Pulse Basicsmentioning

confidence: 99%

Chirped-pulse four-wave Raman mixing in molecular hydrogen

2014

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Four-wave Raman mixing (FWRM) in molecular hydrogen was studied using chirped pump and Stokes pulses emitting at 802 and 1,203 nm, respectively. The group delay dispersion (GDD) of the anti-Stokes pulse was examined employing a frequency-resolved optical gating system at different GDDs of the pump and Stokes pulses (0 or ±1,000 fs 2 ). As a result, the energy and the sign of GDD for the anti-Stokes pulse remained unchanged, when the pump and Stokes pulses had the GDD with the same sign. When the sign was not the same, the energy decreased and only the portion useful for resonant FWRM was converted into a Raman emission. This technique has a potential for use in compensation of dispersion by passing the negatively chirped high-order Raman sidebands through the optics with positive chirps in the spectral region from the deep-ultraviolet to the near-infrared, to generate multiple transform-limited Raman pulses and then to produce an ultrashort optical pulse by a Fourier synthesis of these Raman emissions.

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Section: Chirp Pulse Basicsmentioning

confidence: 99%

Chirped-pulse four-wave Raman mixing in molecular hydrogen

2014

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“…where τ is the time delay between the two pulses in the interferometer [21]. This parameter can be set to zero because the beam is not separated in this study (i.e., no interferometer is used), and this leads to Equation (5).…”

Section: Theoretical Calculationsmentioning

confidence: 99%

“…Thus, the phase locking expected to occur during the process of four-wave Raman mixing, can be confirmed by comparing the experimental data with the simulation results. The GDD can then be expressed as follows [2,21].…”

Section: Theoretical Calculationsmentioning

confidence: 99%

“…For simple on-site measurement of pulse widths, a device based on fringe-resolved autocorrelation (FRAC) was developed, which consisted of an interferometer and a time-of-flight mass spectrometer that was used as a two-photon-response detector to measure a non-resonant two-photon ionization signal [18][19][20][21]. However, the laser beam must be split into two parts and recombined after the interferometer, which reduces the laser pulse energy and then the sensitivity of the mass spectrometer.…”

Section: Introductionmentioning

confidence: 99%

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A Simple Method for the Evaluation of the Pulse Width of an Ultraviolet Femtosecond Laser Used in Two-Photon Ionization Mass Spectrometry

et al. 2016

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A simple method was proposed for on-site evaluation of the pulse width of an ultraviolet femtosecond laser coupled with a mass spectrometer. This technique was based on measurement of a two-photon ionization signal in mass spectrometry by translation of the prism in the pulse compressor of the femtosecond laser. The method was applied to optical pulses that were emitted at wavelengths of 267, 241, and 219 nm; the latter two pulses were generated by four-wave Raman mixing using the third harmonic emission of a Ti:sapphire laser (267 nm) in hydrogen gas. The measurement results show that this approach is useful for evaluation of the pulse width of the ultraviolet femtosecond laser used in mass spectrometry for trace analysis of organic compounds.

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