Femtosecond synchronization of a RF oscillator to a mode-locked Ti:sapphire laser

Kiewiet, F. B.; Kemper, A.; Luiten, O.J.; Brussaard, G.; Wiel, M.J. van der

doi:10.1016/s0168-9002(01)01994-5

Cited by 44 publications

(40 citation statements)

References 4 publications

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“…The synchronization system, in combination with the laser oscillator and RF amplifier, results in a timing jitter of less than 100 fs. This is worse than earlier results of Kiewiet et al, 15 where we found that a similar synchronization system locks the 3 GHz to a 375 MHz oscillator with jitter of less than 20 fs. However, these results are not inconsistent, because the PLL-VCO is only one possible source of jitter.…”

Section: Dscontrasting

confidence: 98%

“…The 3 GHz source is a PLL-VCO built by AccTec BV, based on previous work by Kiewiet et al 15 The femtosecond laser oscillator (FemtoLasers GmbH Femtosource) operates at 75 MHz, which is measured by a fast photodiode (Centronic AEPX65). In the PLL-VCO, the 3 GHz VCO signal is divided by 8 and locked to the 5th harmonic of the laser repetition frequency at 375 MHz.…”

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confidence: 99%

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Direct measurement of synchronization between femtosecond laser pulses and a 3 GHz radio frequency electric field inside a resonant cavity

Brussaard

Lassise

Pasmans

et al. 2013

Applied Physics Letters

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We demonstrate a method to measure synchronization between femtosecond laser pulses and the electric field inside a resonant 3 GHz radio frequency (RF) cavity. The method utilizes the Pockels effect in a crystal inside the RF cavity by measuring the retardation of the components of polarization as a function of RF phase. Resolution of the setup used is shown to be 29 ± 2 fs (root-mean-square, rms), with timing jitter between the laser pulses and the RF field inside the cavity of 96 ± 7 fs (rms). The method provides a tool to reduce jitter and improve time-resolution in ultrafast electron diffraction experiments.

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Section: Dscontrasting

confidence: 98%

mentioning

confidence: 99%

Direct measurement of synchronization between femtosecond laser pulses and a 3 GHz radio frequency electric field inside a resonant cavity

Brussaard

Lassise

Pasmans

et al. 2013

Applied Physics Letters

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“…Due to the relatively flat top of the injected bunch, the requirement for synchronization is relaxed to a level of tens of femtoseconds. A feedback and control electronic circuit to achieve such a level has been reported by Kiewiet et al 17 The associated optimization of the rf cavity dimensions, necessary to obtain the same level of precision in the eventual jitter of the electron bunch at the plasma channel entrance, will be described in a separate paper.…”

Section: A General Considerations and Layout Of The Injector Systemmentioning

confidence: 99%

Front-to-end simulations of the design of a laser wakefield accelerator with external injection

Urbanus

Dijk

Geer

et al. 2006

Journal of Applied Physics

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We report the design of a laser wakefield accelerator (LWA) with external injection by a rf photogun and acceleration by a linear wakefield in a capillary discharge channel. The design process is complex due to the large number of intricately coupled free parameters. To alleviate this problem, we performed front-to-end simulations of the complete system. The tool we used was the general particle-tracking code, extended with a module representing the linear wakefield by a two-dimensional traveling wave with appropriate wavelength and amplitude. Given the limitations of existing technology for the longest discharge plasma wavelength (∼50μm) and shortest electron bunch length (∼100μm), we studied the regime in which the wakefield acts as slicer and buncher, while rejecting a large fraction of the injected bunch. The optimized parameters for the injected bunch are 10pC, 300fs at 6.7MeV, to be injected into a 70mm long channel at a plasma density of 7×1023m−3. A linear wakefield is generated by a 2TW laser focused to 30μm. The simulations predict an accelerated output of 0.6pC, 10fs bunches at 90MeV, with energy spread below 10%. The design is currently being implemented. The design process also led to an important conclusion: output specifications directly comparable to those reported recently from “laser-into-gas jet” experiments are feasible, provided the performance of the rf photogun is considerably enhanced. The paper outlines a photogun design providing such a performance level.

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“…Such synchronization has already been demonstrated and can be achieved routinely. 25 In the simulations, an initial electron bunch with a length of 500 fs rms will be used. This bunch spans several plasma periods, but is short enough to limit the number of accelerated ͑sub-͒bunches to a few up to 20 per injected bunch, as can be seen in Fig.…”

Section: B Electron Bunchesmentioning

confidence: 99%

Parameter study of acceleration of externally injected electrons in the linear laser wakefield regime

et al. 2008

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A parameter study for laser wakefield acceleration is presented, in which externally injected electrons are accelerated in low amplitude plasma waves, represented by an analytical two-dimensional description. Results have been obtained for plasma densities up to 2.6 ϫ 10 24 m −3 , plasma lengths up to 300 mm, laser intensities up to 3.5ϫ 10 21 W / m 2 , and injection of Gaussian model bunches at energies up to 12 MeV. For the range of parameters studied, effects of laser depletion and the influence of the electron bunch on the plasma can be ignored. In the parameter space, a region is identified where final energies of over 100 MeV are reached, at an energy spread of less than 5% and a rms emittance of a few micrometers.

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Femtosecond synchronization of a RF oscillator to a mode-locked Ti:sapphire laser

Cited by 44 publications

References 4 publications

Direct measurement of synchronization between femtosecond laser pulses and a 3 GHz radio frequency electric field inside a resonant cavity

Direct measurement of synchronization between femtosecond laser pulses and a 3 GHz radio frequency electric field inside a resonant cavity

Front-to-end simulations of the design of a laser wakefield accelerator with external injection

Parameter study of acceleration of externally injected electrons in the linear laser wakefield regime

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