High-efficiency, single-stage 7-kHz high-average-power ultrafast laser system

Backus, Sterling; Bartels, Randy A.; Thompson, Sarah T.; Dollinger, R.; Murnane, Margaret M.; Kapteyn, Henry C.

doi:10.1364/ol.26.000465

Cited by 117 publications

(29 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This experiment uses a Ti:sapphire ultrafast laser system producing pulses of energy of 3 mJ and 25-fs pulse duration at a repetition rate of 1 kHz and at a center wavelength of 790 nm (34,35). The pulse is split into pump and probe pulses, with the pump pulse focused onto an SF 6 gas jet at an incident intensity of Ϸ5 ϫ 10 13 W⅐cm Ϫ2 .…”

Section: Resultsmentioning

confidence: 99%

Monitoring molecular dynamics using coherent electrons from high harmonic generation

Wagner

Wüest²,

Christov³

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

183

115

View full text Add to dashboard Cite

We report a previously undescribed spectroscopic probe that makes use of electrons rescattered during the process of highorder harmonic generation. We excite coherent vibrations in SF 6 using impulsive stimulated Raman scattering with a short laser pulse. A second, more intense laser pulse generates high-order harmonics of the fundamental laser, at wavelengths of Ϸ20 -50 nm. The high-order harmonic yield is observed to oscillate, at frequencies corresponding to all of the Raman-active modes of SF6, with an asymmetric mode most visible. The data also show evidence of relaxation dynamics after impulsive excitation of the molecule. Theoretical modeling indicates that the high harmonic yield should be modulated by both Raman and infrared-active vibrational modes. Our results indicate that high harmonic generation is a very sensitive probe of vibrational dynamics and may yield more information simultaneously than conventional ultrafast spectroscopic techniques. Because the de Broglie wavelength of the recolliding electron is on the order of interatomic distances, i.e., Ϸ1.5 Å, small changes in the shape of the molecule lead to large changes in the high harmonic yield. This work therefore demonstrates a previously undescribed spectroscopic technique for probing ultrafast internal dynamics in molecules and, in particular, on the chemically important ground-state potential surface.spectroscopy ͉ ultrafast ͉ x-rays T he use of ultrafast light pulses to visualize chemical dynamics has advanced our fundamental understanding of chemical and biochemical processes, by providing a means of monitoring the motion of atoms within a molecule in real time (1, 2). This new field of femtochemistry has enabled the study of important processes such as the dynamics of molecular wave packets and the biochemical basis of vision (3), as well as proton transfer across membranes.Progress in this area of research has been driven by the development of new ultrashort-pulse light sources, as well as the development of new experimental techniques. Recent work has made use of sources of ultrafast extreme-UV (EUV) (4), x-ray (5, 6), and electron pulses (7, 8) as probes of ultrafast molecular and materials dynamics. These new probes can directly provide atomic-scale spatial resolution (e.g., electron and x-ray diffraction) or site-specific local order (e.g., photoelectron spectroscopy), providing the potential to directly observe chemical reactions in atomic-level detail as they occur. These new tools promise to provide a powerful new window into the microscopic world, particularly as the temporal resolution and energy range of these sources continues to improve.One recent area of research motivated by these goals is the generation of ultrashort EUV light pulses through the process of high-order harmonic generation (HHG) (9). HHG pushes traditional nonlinear optics to an extreme, by coherently combining many laser photons together to generate coherent beams that span from the UV to the kiloelectronvolt (1 eV ϭ 1.602 ϫ 10 Ϫ19 J) region of the spectru...

show abstract

Section: Resultsmentioning

confidence: 99%

Monitoring molecular dynamics using coherent electrons from high harmonic generation

Wagner

Wüest²,

Christov³

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

183

115

View full text Add to dashboard Cite

show abstract

“…Important contributions to the success of these oscillators are their large optical bandwidth, leading to the direct generation of few-cycle pulses, and the excellent phase stability achievable with feed-back [4] and feed-forward stabilization schemes [5]. However, a major drawback of Ti:Sa amplifiers is the high thermal absorption and thermal lensing in the gain medium, which restricts the average powers to a few tens of Watts even with cryogenic cooling [6], thus limiting high-pulse-energy operation to repetition rates significantly lower than 1 MHz. Recently, Yb-based laser technology has rapidly progressed as a powerful competitor to the well-established Ti:Sa technology.…”

Section: Hz Tomentioning

confidence: 99%

Phase-stable, multi-µJ femtosecond pulses from a repetition-rate tunable Ti:Sa-oscillator-seeded Yb-fiber amplifier

et al. 2016

View full text Add to dashboard Cite

400 kHz, which to the best of our knowledge corresponds to the highest phase stability ever demonstrated for highpower, multi-MHz-repetition-rate ultrafast lasers. This system will enable experiments in attosecond physics at unprecedented repetition rates, it offers ideal prerequisites for the generation and field-resolved electro-optical sampling of high-power, broadband infrared pulses, and it is suitable for phase-stable white light generation.

show abstract

“…The femtosecond transient absorption apparatus used a homebuilt ultrafast laser system based on the design of Backus et al 40 Briefly, 15-fs pulses were produced in a mode-locked Ti: sapphire oscillator (KMLabs TS pumped by 4.5 W, 532 nm output from a Spectra-Physics Millennia V laser). The pulse train was amplified using the chirped-pulse-amplification scheme at a repetition rate of 1 kHz.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…The pulse train was amplified using the chirped-pulse-amplification scheme at a repetition rate of 1 kHz. This was achieved in a home-built multipass Ti:sapphire amplifier 40 pumped by the 10-W, 527-nm output of a Spectra-Physics Evolution X laser. The resulting pulses had a pulse width of 70 fs and a pulse energy of 750 µJ and were centered at a wavelength of 800 nm (1.55 eV photon energy).…”

Section: Experimental Techniquesmentioning

confidence: 99%

Monte Carlo Simulation of Exciton Bimolecular Annihilation Dynamics in Supramolecular Semiconductor Architectures

et al. 2007

View full text Add to dashboard Cite

We present a simulation of exciton dynamics in supramolecular assemblies of an oligo-p-phenylenevinylene derivative monofunctionalised with a quadruple hydrogen-bonding group (MOPV). MOPV molecules form helical stacks in dodecane solution through solvophobic and π-π interactions with thermotropic reversibility. We apply a model of incoherent excitation hopping using a Monte Carlo scheme to extract microscopic physical quantities relevant to energy diffusion and bimolecular annihilation processes within isolated nanostructures. We compare the simulation to ultrafast spectroscopic data, namely photoinduced absorption transients at various excitation fluences, their polarization anisotropy, and the dynamic photoluminescence red-shift. We observe that energy diffusion and bimolecular annihilation processes can be described with the same microscopic model based on a Förster-like model that takes into account the spatial extent of the excited state; these two processes are interconnected via the same underlying physics. We extract a high diffusion coefficient (∼0.08 cm 2 s -1 ) over the first few picoseconds following excitation, which plays an important role in dictating the bimolecular annihilation dynamics.

show abstract

High-efficiency, single-stage 7-kHz high-average-power ultrafast laser system

Cited by 117 publications

References 23 publications

Monitoring molecular dynamics using coherent electrons from high harmonic generation

Monitoring molecular dynamics using coherent electrons from high harmonic generation

Phase-stable, multi-µJ femtosecond pulses from a repetition-rate tunable Ti:Sa-oscillator-seeded Yb-fiber amplifier

Monte Carlo Simulation of Exciton Bimolecular Annihilation Dynamics in Supramolecular Semiconductor Architectures

Contact Info

Product

Resources

About