Tunable 50-fs pulse generation in the 250-310-nm ultraviolet range

Ziegler, L. D.; Morais, J. E. V. de; Zhou, Yuan; Constantine, S.; Reed, Murray K.; Steiner-Shepard, Michael K.; Lommel, D.

doi:10.1109/3.709594

Cited by 19 publications

(6 citation statements)

References 13 publications

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“…A complete description of the short-pulse regenerative amplifier system is given in Ref. 54. Pulse widths for this experiment were determined with a homebuilt autocorrelator utilizing a noncollinear arrangement and a 90 m thin Type I BBO (␤-BaB 2 O 4 ) crystal.…”

Section: Methodsmentioning

confidence: 99%

The ejection distribution of solvated electrons generated by the one-photon photodetachment of aqueous I− and two-photon ionization of the solvent

Kloepfer

Vilchiz

Lenchenkov

et al. 2000

The Journal of Chemical Physics

191

362

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Articles you may be interested inOne-photon photodetachment of I − in glycerol: Spectra and yield of solvated electrons in the temperature range 329 T 536 K Mechanisms of the ultrafast production and recombination of solvated electrons in weakly polar fluids: Comparison of multiphoton ionization and detachment via the charge-transfer-to-solvent transition of Na − in THF The spectra and the relative yield of solvated electrons produced by resonant photodetachment of iodide anion in ethylene glycol in the temperature range 296T453 K Two-photon dissociation and ionization of liquid water studied by femtosecond transient absorption spectroscopyThe ultrafast dynamics following one-photon UV photodetachment of I Ϫ ions in aqueous solution are compared with those following two-photon ionization of the solvent. Ultrafast pump-probe experiments employing 50 fs ultraviolet pulses reveal similar and very rapid time scales for electron ejection. However, the electron ejection process from water pumped into the conduction band and from iodide ions detached at threshold are readily distinguishable. The observed picosecond timescale geminate recombination and electron escape dynamics are reconstructed using two different models, a diffusion-limited return of the electron from ϳ15 Å to its parent and a competing kinetics model governed by the reverse electron transfer rate. We conclude that the ''ejected'' electron in the halide detachment is merely separated from the halogen atom within the same solvent shell. The assignment of detachment into a contact pair is based on the recombination profile rather than by the postulate of any new spectral absorption due to an electron in a contact pair. The contact pair is surprisingly long-lived and the nonadiabatic recombination is rather slow considering the proximity of the partners. Experiments in mixed solvents confirm our assignment of the two distinct ejection mechanisms. The detachment mechanism is therefore fundamentally different in the resonant ͑one photon͒ charge-transfer-to-solvent ͑CTTS͒ process from the multiphoton detachment of aqueous iodide ions, which bears more similarity to the direct solvent ionization.

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Section: Methodsmentioning

confidence: 99%

The ejection distribution of solvated electrons generated by the one-photon photodetachment of aqueous I− and two-photon ionization of the solvent

Kloepfer

Vilchiz

Lenchenkov

et al. 2000

The Journal of Chemical Physics

191

362

View full text Add to dashboard Cite

show abstract

“…It allows tunability in the visible [5][6][7][8] and shortest pulse durations [9]. Only a few reports are found on the extension to UV wavelengths [10][11][12]. The early developments were based on Ti:sapphire pump systems, and improvements like noncollinear phase-matching were pioneered with kHz systems [13].…”

mentioning

confidence: 99%

Sub-20 fs μJ-energy pulses tunable down to the near-UV from a 1 MHz Yb-fiber laser system

Bradler

Riedle

2014

Opt. Lett.

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Optical parametric amplifiers render widely tunable ultrashort pulses, but for full spectral coverage, complex mixing schemes are needed. In particular, the blue and near-UV part of the spectrum is not directly reached with the 800 nm pump from Ti:sapphire systems or the 1030 nm pump of Yb-based lasers. We combine third harmonic pumping at 343 nm with seeding by a second harmonic (SH) pumped continuum to tune a noncollinear optical parametric amplifier down to 395 nm. Together with a SH pumped branch, the full range from 395 to 970 nm is covered with 20 fs pulse length or less. Pulse energies up to the μJ-level with an average power of up to 200 mW at 200 kHz and 480 mW at 1 MHz are achieved. With additional frequency doubling, the full range down to 210 nm is reached without gap. Two-photon absorption in the amplifier crystal is discussed as the critical issue in UV-pumped systems.

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“…Half of this spread comes from THz shot-toshot fluctuations (2%), while another large contribution comes from the spread in electron emission time: ∆t emit = τ U V = 275 fs = T THz /8. By stabilizing the laser and shortening τ U V via an optical parametric amplifier [334], the energy spread can be further reduced. In Fig.…”

Section: Experimental Test Of the Parallel-plate Low-energy Gunmentioning

confidence: 99%

Terahertz Acceleration Technology Towards Compact Light Sources

Fallahi¹

2019

Preprint

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Tunable 50-fs pulse generation in the 250-310-nm ultraviolet range

Cited by 19 publications

References 13 publications

The ejection distribution of solvated electrons generated by the one-photon photodetachment of aqueous I− and two-photon ionization of the solvent

The ejection distribution of solvated electrons generated by the one-photon photodetachment of aqueous I− and two-photon ionization of the solvent

Sub-20 fs μJ-energy pulses tunable down to the near-UV from a 1 MHz Yb-fiber laser system

Terahertz Acceleration Technology Towards Compact Light Sources

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