Power scaling of supercontinuum seeded megahertz-repetition rate optical parametric chirped pulse amplifiers

Riedel, Robert; Stephanides, A.; Prandolini, M. J.; Gronloh, Bastian; Jungbluth, Bernd; Mans, T.; Tavella, F.

doi:10.1364/ol.39.001422

Cited by 41 publications

(19 citation statements)

References 18 publications

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“…A white-light continuum is difficult to achieve with long pump pulses [45], but is here successfully established using a 4 mm YAG crystal pumped with pulse energies of about 7 μJ, focused using an f = 80 mm lens. Similar to earlier results [46], the continuum smoothly covers the range 480-950 nm and makes an ideal seed light for the NOPA process in a 2 mm thick type-I BBO crystal at 37°. The pump pulses at 344 nm are derived from the thin-disk laser by frequency-tripling in a sequence of two group-velocity-compensating BBO crystals [44], a 0.8 mm thick type-I crystal at 23.5°for second harmonic generation followed by a 1.5 mm thick type-II crystal at 62.8°for sum-frequency mixing.…”

Section: Experimental Setup-tunable Visible Noncollinear Optical Parasupporting

confidence: 84%

Femtosecond single-electron pulses generated by two-photon photoemission close to the work function

et al. 2015

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Diffraction and microscopy with ultrashort electron pulses can reveal atomic-scale motion during matter transformations. However, the spatiotemporal resolution is significantly limited by the achievable quality of the electron source. Here we report on the emission of femtosecond single/fewelectron pulses from a flat metal surface via two-photon photoemission at 50-100 kHz. As pump we use wavelength-tunable visible 40 fs pulses from a noncollinear optical parametric amplifier pumped by a picosecond thin-disk laser. We demonstrate the beneficial influence of photon energies close to the photocathode's work function for the coherence and duration of the electron pulses. The source's stability approaches the shot noise limit after removing second-order correlation with the driving laser power. Two-photon photoemission offers genuine advantages in minimizing emission duration and effective source size directly at the location of photoemission. It produces an unprecedented combination of coherent, ultrashort and ultrastable single/few-electron wave packets for timeresolving structural dynamics.

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Section: Experimental Setup-tunable Visible Noncollinear Optical Parasupporting

confidence: 84%

Femtosecond single-electron pulses generated by two-photon photoemission close to the work function

et al. 2015

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“…Construction of wide-field three-photon instrumentation will become much easier with the development of commercially available OPCPA designs offering several tens of Watts of power throughout the visible and near-infrared spectrum45–47. Excitation can therefore be performed faster, and over larger areas compared to the Ti:Sapphire-based system used here.…”

Section: Discussionmentioning

confidence: 99%

Wide-field three-photon excitation in biological samples

et al. 2016

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Three-photon wide-field depth-resolved excitation is used to overcome some of the limitations in conventional point-scanning two- and three-photon microscopy. Excitation of chromophores as diverse as channelrhodopsins and quantum dots is shown, and a penetration depth of more than 700 μm into fixed scattering brain tissue is achieved, approximately twice as deep as that achieved using two-photon wide-field excitation. Compatibility with live animal experiments is confirmed by imaging the cerebral vasculature of an anesthetized mouse; a complete focal stack was obtained without any evidence of photodamage. As an additional validation of the utility of wide-field three-photon excitation, functional excitation is demonstrated by performing three-photon optogenetic stimulation of cultured mouse hippocampal neurons expressing a channelrhodopsin; action potentials could reliably be excited without causing photodamage.

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“…Indeed, the availability of picosecond pulse-generated SC with a well-behaved spectral phase that is compressible down to transform-limit paved new avenues in the development of picosecond-laser pumped noncollinear optical parametric amplifiers [213] and of a whole new generation of compact SC-seeded OPCPA systems. These systems are built around amplified solely sub-picosecond and picosecond lasers, such as Yb:KYW [214], Yb:YAG [51,207,[215][216][217] and Yb-fibre [218,219], and are designed to provide few optical cycle pulses in the near-and mid-infrared at very high repetition rates. Finally, picosecond SC serves as a seed signal in the mid-infrared optical parametric amplifiers driven by amplified picosecond Ho:YAG lasers [220,221].…”

Section: Laser Hostsmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

172

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Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems.

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Power scaling of supercontinuum seeded megahertz-repetition rate optical parametric chirped pulse amplifiers

Cited by 41 publications

References 18 publications

Femtosecond single-electron pulses generated by two-photon photoemission close to the work function

Femtosecond single-electron pulses generated by two-photon photoemission close to the work function

Wide-field three-photon excitation in biological samples

Ultrafast supercontinuum generation in bulk condensed media

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