Sub-10-fs, terawatt-scale Ti:sapphire laser system

Seres, J.; Müller, Alexander; Seres, E.; O’Keeffe, Kevin; Lenner, Miklós; Herzog, R.; Kaplan, D.; Spielmann, Christian; Krausz, Ferenc

doi:10.1364/ol.28.001832

Cited by 86 publications

(32 citation statements)

References 17 publications

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“…We have selected the chirped-pulse amplification since it offers the pulse energies of the order of millijoules at the kilohertz repetition rate [28]. It is worth noticing that the chirped-pulse amplification applied to the ultrashort solid-state laser pulses can raise the powers of the generated optical pulses up to gigawatt frontiers, thus making the technique favourite for the high-field lasers and the ultrafast spectroscopy [29][30][31][32]. Before chirped-pulse amplifying, a stretcher is used for stretching out the seed pulses temporally and spectrally in order to reduce the peak-power level and avoid destruction of the gain medium [33].…”

Section: Methodsmentioning

confidence: 99%

A method for controlling the bandwidth of high-energy, few-optical-cycle laser pulses tunable from the visible to the near-infrared

Tawfik¹

2015

Ukr. J. Phys. Opt.

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Abstract. In this work we report a new method for controlling the bandwidth of few-cycle optical pulses, using another femtosecond laser pulses chirped in a neonfilled hollow-core fibre. The observed bandwidth varies from 25 to 234 nm in the optical wavelength region 600-950 nm. The pulse energy has for the first time reached a sub-millijoule frontier at 1 kHz. The input pulses are positively chirped using a chirped-pulse amplifier to acquire the widths 32-56 fs at the entrance of the hollow fibre. Then the pulses are highly dispersed due to a self-phase modulation in a nonlinear medium (a neon gas) followed by a pair of chirped mirrors that compensate the dispersion. We have found that this scheme allows for direct tuning of the output-pulse bandwidth while varying the chirping of the input pulses under different neon-gas pressures. Our results can give an opportunity for controlling the interactions in strong electric fields on the ultrafast time scales and are crucial for regenerating attosecond X-ray pulses.

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Section: Methodsmentioning

confidence: 99%

A method for controlling the bandwidth of high-energy, few-optical-cycle laser pulses tunable from the visible to the near-infrared

Tawfik¹

2015

Ukr. J. Phys. Opt.

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“…For these experiments, we used a table-top Ti:sapphire laser system [28][29][30][31] with a 1-kHz repetition rate. The laser system delivered 15 fs-long pulses with 3 mJ of pulse energy.…”

Section: Experiments 2: Improved Phase Matching With Few-cycle Laser Pmentioning

confidence: 99%

“…In this experiment, we used the same Ti:sapphire laser system as described in the previous section [29], delivering 15 fs-long pulses with 3 mJ of energy at a 1-kHz repetition rate. The acousto-optic programmable dispersive filter (AOPDF, DAZZLER, Fastlite) in the laser system was set to generate double pulses with a variable delay and identical pulse energies of 0.75 mJ.…”

Section: Experiments 3: Improving Phase Matching With a Double-pulse Ementioning

confidence: 99%

Quantum Path Interference and Multiple Electron Scattering in Soft X-Ray High-Order Harmonic Generation

Seres

Landgraf

et al. 2015

Photonics

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High-order harmonic generation is an important mechanism to generate coherent radiation in the few-100-eV spectral range with ultrashort laser pulses. Moreover, a closer inspection of the measured spectra provides unique information about the underlying physics and allows deriving guidelines for improvements. The long-range modulation of the spectral envelope is linked to phase matching, and we will show how to improve it with a double-pulse excitation scheme. Additionally, the spectrum contains only every fourth harmonic, which can be well explained by the quantum interference of multiple scattered electrons, and two dominant electron trajectories were selected by X-ray parametric interaction.

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“…Recently, high-power laser schemes mostly employ Ti:sapphire amplifiers and many terawatt-class laser schemes have been developed [19,20]. However, these very complex systems suffer from wavefront distortions and thermal lensing appearing due to thermal load imposed on the amplifiers by intense short pulses.…”

Section: Introductionmentioning

confidence: 99%

High-power table-top white-light few-cycle laser generator

Tawfik¹

2015

Ukr. J. Phys. Opt.

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Abstract.We have achieved experimentally a generation of white-light few-cycle femtosecond laser pulses, using a neon-filled hollow-core fibre. The pulses observed by us are as short as 6.22 fs at the repetition rate of 1 kHz, when the input is characterized by the parameters 2.5 mJ and 33 fs. Pulse compression has been achieved using a supercontinuum produced in a static neon-filled hollow fibre, while a pair of chirped mirrors have compensated the dispersion. Our technique allows for directly tuning the pulse duration via changing the gas pressure, while maintaining near-transform-limited pulses with constant output energies and thus reducing the complications introduced by the chirped pulses. Using the measurements of the optical transmission of the fibre as a function of the gas pressure, we have testified a high enough throughput exceeding 60%. This demonstrates the successful compression that yields few-cycle femtosecond-long pulses, with a wide spectral bandwidth. The technique can be used when simultaneously exciting different states in complex molecules.

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Sub-10-fs, terawatt-scale Ti:sapphire laser system

Cited by 86 publications

References 17 publications

A method for controlling the bandwidth of high-energy, few-optical-cycle laser pulses tunable from the visible to the near-infrared

A method for controlling the bandwidth of high-energy, few-optical-cycle laser pulses tunable from the visible to the near-infrared

Quantum Path Interference and Multiple Electron Scattering in Soft X-Ray High-Order Harmonic Generation

High-power table-top white-light few-cycle laser generator

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