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Novak J.,Academy of Sciences of the Czech Republic | Novak J.,Czech Technical University | Bakule P.,Academy of Sciences of the Czech Republic | Green J.T.,Academy of Sciences of the Czech Republic | And 7 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

We report on the initial performance of the first ELI-Beamlines high repetition rate, thin disk-based OPCPA pump laser. The laser is designed to produce a pulse train with pulse energies of 10-30 mJ at a 1 kHz repetition rate and is intended to be used as a pump source for an OPCPA amplifier. While the preliminary tests and analysis show that these target energies are well within the capabilities of the equipment available, the output energies of the current design are limited by self-phase modulation. We discuss the sources of this modulation and a new amplifier design to reduce these nonlinear effects. The efficiency of the second harmonic conversion of the thin disk amplifier output is measured to be higher than 65% and scaling to higher energies is discussed. © 2013 SPIE. Source


Gottwald T.,TRUMPF Laser GmbHCo. KG | Stolzenburg C.,TRUMPF Laser GmbHCo. KG | Bauer D.,TRUMPF Laser GmbHCo. KG | Kleinbauer J.,TRUMPF Laser GmbHCo. KG | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

This paper highlights the latest advances of disk laser technology at Trumpf. The disk laser combines unique properties, especially high output brilliance (at the lowest pump brilliance requirements of any high power platform), power scalability and broad applicability from cw to ps systems. In the new generation of cw disk lasers, 6kW are extracted from one disk in an industrial product at beam qualities suitable for welding. Moreover, scaling laser power to 10 kW per disk and resonators with higher brilliance are discussed. These advances are enabled by a combination of power scaling and increase of optical-to-optical efficiency. In addition, applications of the disk laser principle to pulsed operation, from ns to ps duration, at infrared and green wavelengths are discussed. Finally, an outlook on the capabilities of disk lasers towards highest cw power and ultra-high peak powers of petawatts and beyond is given. © 2012 SPIE. Source


Liu X.,Light Technology | Liu X.,Institute of Microstructure Technology IMT | Lebedkin S.,Institute of Nanotechnology INT | Besser H.,Karlsruhe Institute of Technology | And 13 more authors.
ACS Nano | Year: 2015

Organic semiconductor distributed feedback (DFB) lasers are of interest as external or chip-integrated excitation sources in the visible spectral range for miniaturized Raman-on-chip biomolecular detection systems. However, the inherently limited excitation power of such lasers as well as oftentimes low analyte concentrations requires efficient Raman detection schemes. We present an approach using surface-enhanced Raman scattering (SERS) substrates, which has the potential to significantly improve the sensitivity of on-chip Raman detection systems. Instead of lithographically fabricated Au/Ag-coated periodic nanostructures on Si/SiO2 wafers, which can provide large SERS enhancements but are expensive and time-consuming to fabricate, we use low-cost and large-area SERS substrates made via laser-assisted nanoreplication. These substrates comprise gold-coated cyclic olefin copolymer (COC) nanopillar arrays, which show an estimated SERS enhancement factor of up to ∼107. The effect of the nanopillar diameter (60-260 nm) and interpillar spacing (10-190 nm) on the local electromagnetic field enhancement is studied by finite-difference-time-domain (FDTD) modeling. The favorable SERS detection capability of this setup is verified by using rhodamine 6G and adenosine as analytes and an organic semiconductor DFB laser with an emission wavelength of 631.4 nm as the external fiber-coupled excitation source. © 2014 American Chemical Society. Source


Novak J.,Academy of Sciences of the Czech Republic | Novak J.,Czech Technical University | Green J.T.,Academy of Sciences of the Czech Republic | Metzger T.,TRUMPF Scientific Lasers GmbH Co. KG | And 12 more authors.
Optics Express | Year: 2016

We report on a frequency-doubled picosecond Yb:YAG thin disk regenerative amplifier, developed as a pump laser for a kilohertz repetition rate OPCPA. At a repetition rate of 1 kHz, the compressed output of the regenerative amplifier has a pulse duration of 1.2 ps and pulse energy of 90 mJ with energy stability of σ <0.8% and M2 <1.2. The pulses are frequency doubled in an LBO crystal yielding 42 mJ at 515 nm. © 2016 Optical Society of America. Source


Schneider W.,Ludwig Maximilians University of Munich | Schneider W.,Max Planck Institute of Quantum Optics | Ryabov A.,Ludwig Maximilians University of Munich | Ryabov A.,Max Planck Institute of Quantum Optics | And 7 more authors.
Optics Letters | Year: 2014

Yb:YAG thin-disk lasers offer extraordinary output power, but systems delivering femtosecond pulses at a repetition rate of hundreds of kilohertz are scarce, even though this regime is ideal for ultrafast electron diffraction, coincidence imaging, attosecond science, and terahertz (THz) spectroscopy. Here we describe a regenerative Yb:YAG amplifier based on thin-disk technology, producing 800-fs pulses at a repetition rate adjustable between 50 and 400 kHz. The key design elements are a short regenerative cavity and fast-switching Pockels cell. The average output power is 130 Wbefore the compressor and 100 W after compression, which at 300 kHz corresponds to pulse energies of 430 and 330 μJ, respectively. This is sufficient for a wide range of nonlinear conversions and broadening/compression schemes. As a first application, we use optical rectification in LiNbO3 to produce 30-nJ single-cycle THz pulses with 6W pump power. The electric field exceeds 10 kV/cm at acentral frequency of 0.3 THz, suitable for driving structural dynamics or controlling electron beams. © 2014 Optical Society of America. Source

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