Delay-time modulation spectroscopy using a cw mode-locked Nd:YAG laser synchronized with the synchrotron radiation pulses (invited)

Mitani, Tadaoki; Okamoto, Hiroshi; Takagi, Yoshihiro; Watanabe, Makoto; Fukui, Kiichi; Koshihara, Shin‐ya; Ito, Chihiro

doi:10.1063/1.1141037

Cited by 21 publications

(7 citation statements)

References 7 publications

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“…The standard synchrotron storage ring generates tens of megahertz optical pulse trains with each pulse having the pulse duration of tens to hundreds of picoseconds. One of the authors reported 22 an electronic synchronization for the pump-probe measurement between the SR and picosecond laser pulses with a time resolution of 500 ps ͑limited by the SR pulse duration͒. Recent commercial femtosecond lasers with an electronic synchronization system can restrict the timing jitter to an external signal within several picoseconds.…”

Section: A Possible Extention To a Combination Of The Synchrotron mentioning

confidence: 99%

Subpicosecond optical sampling spectrometer using asynchronous tunable mode-locked lasers

Takagi

Adachi

1999

Review of Scientific Instruments

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Articles you may be interested inExciton resonance tuning for the generation of subpicosecond pulses from a mode-locked semiconductor disk laser Appl.A multiplex infrared-visible sum-frequency spectrometer with wavelength tunability of the visible probe New picosecond laser system for easy tunability over the whole ultraviolet/visible/near infrared wavelength range based on flexible harmonic generation and optical parametric oscillation Rev. Sci. Instrum. 72, 36 (2001); 10.1063/1.1326930Actively mode-locked erbium fiber ring laser using a Fabry-Perot semiconductor modulator as mode locker and tunable filter

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Section: A Possible Extention To a Combination Of The Synchrotron mentioning

confidence: 99%

Subpicosecond optical sampling spectrometer using asynchronous tunable mode-locked lasers

Takagi

Adachi

1999

Review of Scientific Instruments

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“…The development of versatile methodology for highly time-resolved measurements is therefore a subject of practical interest. The primary requirement for realizing well controlled timing between two photon sources is to synchronize them, and indeed much effort has been made since the early days of the development of synchrotron storage rings (Meyer et al, 1987;Mitani et al, 1989;Lacoursiere et al, 1994;Gatzke et al, 1995Gatzke et al, , 1998Winter et al, 1998;Tanaka et al, 2000). For construction of rigid electronic synchronization, the laser should be kept in a very stable mode-locked operation, including fine and fast mechanical control of cavity length to compensate for the fluctuation in pulse frequency.…”

Section: Introductionmentioning

confidence: 99%

Highly time-resolved correlation measurement between laser and synchrotron radiation pulses without synchronization control

Takagi

Nakano

Arikawa

et al. 2005

J Synchrotron Radiat

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A mode-locked laser has been introduced in combination with synchrotron radiation to establish a versatile technique for highly time-resolved correlation measurements utilizing the short-pulse and high-pulse frequency characteristics of both photon sources. Successive pulse timing delay detected by nonlinear optical mixing between the two sources yields a cross-correlation profile capable of accurate measurement of the picosecond pulse profile of the synchrotron radiation without any synchronization control. Although the experiment was performed in the visible spectral domain, the present technique opens up a methodology for time-resolved spectroscopy in femtosecond and higher-energy domains by introducing a suitable nonlinear process that informs of the pulse coincidence between the two radiation sources.

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“…Already done in the solid-state [7] and liquid phase [8] but never yet in the gas phase where the target density is very low, a time-resolved laser+synchrotron experiment is presented here on a simple test system : helium. The experimental set-up is described in detail elsewhere [9].…”

Section: The Experimentsmentioning

confidence: 99%

Synchronization of a mode-locked Ar⁺ laser with the synchrotron radiation: application to the two-photon ionization (VUV + visible) of helium

et al. 1994

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: a two-color experiment combining and synchronizing a mode-locked Ar + laser and the synchrotron radiation has been set-up allowing to perform time-resolved pump and probe experiment on the ns time-scale. As a test experiment, the time-resolved (1+1) photoionization of helium via the ls3p state is presented. 1.INTRODUCTIONLaser and synchrotron radiation (SR) are photon sources with very specific properties, monochromaticity and high photon flux for the former, and a very broad tunability and high photon energy for the latter. To take simultaneous advantage of these features, it is especially interesting to combine the two photon sources to perform pump and probe experiments in which a first photon prepares an excited state of the studied system or a transient species which is analyzed by a second photon via an excitation into either a discrete or an electronic or nuclear continuous state [1,2].According to this scheme several experiments have been recently performed combining a visible cw laser to the SR to study the photoionization of excited [3] and aligned atoms [4] and of laser induced dissociation fragments [5]. In these experiments, the lifetime of the intermediate state in the interaction region is of the same order of magnitude as the SR interpuise period (Tsr=120 ns in the case of Super-ACO) so that the use of cw lasers is satisfactory. At the opposite, if the intermediate state has a much shorter lifetime, it is necessary to concentrate in time the two photons, i.e. to use a pulsed laser synchronous with the SR, with comparable repetition rates, in order to obtain an efficient pumping process. Note that MHz repetition rates are very well suited when space charging, false coincidences or optical damage have to be avoided. In addition, by scanning the delay between the two pulses of light, one can have access to the lifetime of the excited state and perform time-resolved spectroscopy, in which the dynamics of the excited state is sampled in time by the delayed probe photon while keeping a continuous detection scheme, as in a stroboscopic experiment. Therefore, the temporal resolution of such an experiment is limited by the temporal cross correlation between the two pulses and not by the speed of the detector [6J. Moreover, the high peak power of a pulsed laser allows the production of non-linear processes such as multiphoton absorption. 2.THE EXPERIMENTAlready done in the solid-state [7] and liquid phase [8] but never yet in the gas phase where the target density is very low, a time-resolved laser+synchrotron experiment is presented here on a simple test system : helium. The experimental set-up is described in detail elsewhere [9]. Briefly, we have synchronized a mode-locked Ar + laser at 514 nm Article published by EDP Sciences and available at http://www.annphys.org or http://dx

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Delay-time modulation spectroscopy using a cw mode-locked Nd:YAG laser synchronized with the synchrotron radiation pulses (invited)

Cited by 21 publications

References 7 publications

Subpicosecond optical sampling spectrometer using asynchronous tunable mode-locked lasers

Subpicosecond optical sampling spectrometer using asynchronous tunable mode-locked lasers

Highly time-resolved correlation measurement between laser and synchrotron radiation pulses without synchronization control

Synchronization of a mode-locked Ar⁺ laser with the synchrotron radiation: application to the two-photon ionization (VUV + visible) of helium

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Delay-time modulation spectroscopy using a cw mode-locked Nd:YAG laser synchronized with the synchrotron radiation pulses (invited)

Cited by 21 publications

References 7 publications

Subpicosecond optical sampling spectrometer using asynchronous tunable mode-locked lasers

Subpicosecond optical sampling spectrometer using asynchronous tunable mode-locked lasers

Highly time-resolved correlation measurement between laser and synchrotron radiation pulses without synchronization control

Synchronization of a mode-locked Ar+ laser with the synchrotron radiation: application to the two-photon ionization (VUV + visible) of helium

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Synchronization of a mode-locked Ar⁺ laser with the synchrotron radiation: application to the two-photon ionization (VUV + visible) of helium