A 325-W-average-power fiber CPA system delivering Sub-400 fs pulses (2009)
Eidam, T., Hädrich, S., Röser, F., Seise, E., Gottschall, T., Rothhardt, J., ...
A high-average-power Yb-doped fiber chirped-pulse amplification system is presented. Compressed average power of 325 W at 40 MHz repetition rate corresponding to 8.2 mu J pulse energy is extracted....
Limpert, J., Röser, F., Schimpf, D.N., Seise, E., Eidam, T., Hädrich, S., ...
We review the main challenges and give design guidelines for high-peak-power high-average-power fiber-based chirped-pulse amplification (CPA) systems. It is clearly pointed out that the lowest order...
2 kW incoherent beam combining of four narrow-linewidth photonic crystal fiber amplifiers (2009)
Wirth, C., Schmidt, O., Tsybin, I., Schreiber, T., Peschel, T., Brückner, F., ...
We report on beam combining of four narrow-linewidth fiber amplifier chains, running at different wavelengths and each delivering 500 W optical output power. The main amplifier stage consists of a...
187 W, 3.7 mJ from spectrally combined pulsed 2 ns fiber amplifiers (2009)
Schmidt, O., Andersen, T.V., Limpert, J., Tünnermann, A.
We report on a spectral combination of four 2 ns pulsed fiber amplifier systems to a total output power of 187 W at a 50 kHz repetition rate resulting in >3.7 mJ of pulse energy and 1.7 MW of pulse...
80 kHz repetition rate high power fiber amplifier flat-top pulse pumped OPCPA based on BIB3O6 (2009)
Rothhardt, J., Hädrich, S., Limpert, J., Tünnermann, A.
We present a high peak power optical parametric chirped pulse amplifier (OPCPA) seeded by a cavity dumped Ti:Sapphire oscillator. A frequency doubled high power Ytterbium-doped fiber amplifier is...
Brückner, C., Käsebier, T., Pradarutti, B., Riehemann, S., Notni, G., ...
The optimal structural parameters for an antireflective structure in high resistive float zone silicon are deduced for a rectangular and a hexagonal structure. For this the dependence of the...
Bloch-zener oscillations in binary superlattices (2009)
Dreisow, F., Szameit, A., Heinrich, M., Pertsch, T., Nolte, S., Tünnermann, A., ...
Bloch-Zener oscillations, i.e., the coherent superposition of Bloch oscillations and Zener tunneling between minibands of a binary lattice, are experimentally demonstrated for light waves in curved...
Hädrich, S., Rothhardt, J., Eidam, T., Limpert, J., Tünnermann, A.
A simple, robust and compact pulse compressor for high-repetition rate high-peak power fiber chirped pulse amplification systems is presented. We use noble-gas-filled hollow fibers for spectral...
Novel construction of a deformable mirror for laser beam shaping (2009)
Bruchmann, C., Eberhardt, R., Beckert, E., Peschel, T., Gramens, S., Gebhardt, S.E., ...
This paper reports on a novel construction of a deformable mirror for laser beam shaping. The deformable mirror is actuated by screen-printed thick film piezoceramic unimorphs based on lead zirconate...
Observation of two-dimensional defect surface solitons (2009)
Szameit, A., Kartashov, Y.V., Heinrich, M., Dreisow, F., Pertsch, T., Nolte, S., ...
We report on the experimental observation of two-dimensional solitons located in defect channels at the surface of a hexagonal waveguide array. The threshold power for the excitation of solitons...
Incoherent beam combining of continuous-wave and pulsed Yb-doped fiber amplifiers (2009)
Schreiber, T., Wirth, C., Schmidt, O., Andersen, T.V., Tsybin, I., Böhme, S., ...
We review the technique of incoherent beam combining and show experimentally the combination of four continuous wave fiber amplifiers to an average power of 2 kW and four pulsed 2 ns fiber amplifiers...
Polychromatic dynamic localization in curved photonic lattices (2009)
Szameit, A., Garanovich, I.L., Heinrich, M., Sukhorukov, A.A., Dreisow, F., Pertsch, T., ...
Dynamic localization is the suppression of the broadening of a charged-particle wave packet as it moves along a periodic potential in an a. c. electric field(1-3). The same effect occurs for optical...
Soliton excitation in waveguide arrays with an effective intermediate dimensionality (2009)
Szameit, A., Kartashov, Y.V., Dreisow, F., Heinrich, M., Pertsch, T., Nolte, S., ...
We reveal and observe experimentally significant modifications undertaken by discrete solitons in waveguide lattices upon the continuous transformation of the lattice structure from one-dimensional...
Derivation of Raman threshold formulas for CW double-clad fiber amplifiers (2009)
Jauregui, C., Limpert, J., Tünnermann, A.
We show that the classic Raman threshold formula is unsuitable to accurately predict the onset of Raman scattering in high-power CW double-clad fiber amplifiers. Consequently new analytical formulas...
Self-phase modulation compensated by positive dispersion in chirped-pulse systems (2009)
Schimpf, D.N., Seise, E., Limpert, J., Tünnermann, A.
We experimentally demonstrate compensation of the impact of Kerr-nonlinearity with positive dispersion in chirped-pulse systems. The condition for the phase-compensation is derived and design...
Polarization-independent negative-index metamaterial in the near infrared (2009)
Helgert, C., Menzel, C., Rockstuhl, C., Pshenay-Severin, E., Chipouline, A., ...
We present and evaluate theoretically and experimentally a design for a negative-index metamaterial that is termed the "Swiss cross" structure. Compared with the established fishnet structure, the...
Jovanovic, N., Thomas, J., Williams, R.J., Steel, M.J., Marshall, G., Fürbach, A., ...
Fiber Bragg gratings inscribed with a femtosecond laser using the point-by-point (PbP) technique have polarization dependent grating strength (PDGS) and exhibit birefringence. In this paper we...
Inhibition of light tunneling in waveguide arrays (2009)
Szameit, A., Kartashov, Y.V., Dreisow, F., Heinrich, M., Pertsch, T., Nolte, S., ...
We report the observation of almost perfect light tunneling inhibition at the edge and inside laser-written waveguide arrays due to band collapse. When the refractive index of the guiding channels is...
Ultrathin membranes in x-cut lithium niobate (2009)
Schrempel, F., Gischkat, T., Hartung, H., Höche, T., Tünnermann, A., ...
Ion-beam enhanced etching is used to pattern a bulk lithium niobate crystal with ultrathin membranes. By the implementation of an air gap beneath the membrane, high index contrast is achieved. A...
Direct observation of Landau-Zener tunneling in a curved optical waveguide coupler (2009)
Dreisow, F., Szameit, A., Heinrich, M., Nolte, S., Tünnermann, A., Ornigotti, M., ...
An electromagnetic realization of Landau-Zener (LZ) tunneling is experimentally demonstrated in femtosecond-laser written waveguide couplers with a cubically bent axis. Quantitative measurements of...
Approaching microjoule-level pulse energy with mode-locked femtosecond fiber lasers (2009)
Ortac, B., Baumgartl, M., Limpert, J., Tünnermann, A.
We report on the generation of high-energy ultrashort pulses from a mode-locked Yb-doped large-mode-area fiber laser operating in the all-normal dispersion regime. The self-starting fiber laser emits...
Spatio-temporal light propagation in complex two-dimensional waveguide lattices (2009)
Pertsch, T., Eilenberger, F., Minardi, S., Nolte, S., Lederer, F., Tünnermann, A., ...
We investigate the dynamics of spatio-temporal nonlinear localization in arrays of evanescently coupled silica fiber arrays. In contrast to continuous systems the formation of stable light bullets...
Photonic crystals in lithium niobate by ion-beam enhanced etching (2009)
Hartung, H., Geiss, R., Gischkat, T., Schrempel, F., Iliew, R., Pertsch, T., ...
A photonic crystal defect waveguide fabricated in a freestanding LiNbO3 membrane is presented. The three dimensional patterning was done by means of ion-beam enhanced etching.
Nonlinear effects in silica and hybrid silica/silicon disc micro resonators (2009)
Schmidt, C., Chipouline, A., Käsebier, T., Chowdhury, G.K., Tünnermann, A., ...
A spectral response of silica and hybrid silica/silicon disc microresonators is investigated and their different nonlinear behavior is discussed in terms of different sources of nonlinearity.
Average power of 1.1 kW from spectrally combined, fiber-amplified, nanosecond-pulsed sources (2009)
Schmidt, O., Wirth, C., Tsybin, I., Schreiber, T., Eberhardt, R., Limpert, J., ...
We report on spectral combination of four high repetition rate 5 ns pulsed Yb-doped fiber amplifiers at 1 mu m wavelength. The output beam is spatially and temporally superposed by use of an...
Gischkat, T., Hartung, H., Schrempel, F., Kley, E.B., Tünnermann, A., Wesch, W.
In order to investigate the damage formation and etching behavior of lithium niobate (LiNbO3) due to the electronic energy deposition, x-cut LiNbO3 was irradiated at room temperature with 5 MeV...
Observation of two-dimensional coherent surface vector lattice solitons (2009)
Heinrich, M., Kartashov, Y.V., Szameit, A., Dreisow, F., Keil, R., Nolte, S., ...
We report, to the best of our knowledge, the first experimental observation of vector surface solitons, which form at the edge and in the corner of two-dimensional laser-written waveguide arrays....
Effective properties of amorphous metamaterials (2009)
Helgert, C., Rockstuhl, C., Etrich, C., Menzel, C., Tünnermann, A., ...
We experimentally and numerically study the propagation of light through amorphous metamaterials. For this purpose we introduce a precisely controllable degree of positional disorder into a perfectly...
Double-element metamaterial with negative index at near-infrared wavelengths (2009)
Pshenay-Severin, E., Hübner, U., Menzel, C., Helgert, C., Chipouline, A., Rockstuhl, C., ...
We present the realization of a metamaterial that combines double cut wires and continuous wires in its unit cell. This double-element geometry together with the applied layer-by-layer fabrication...
Large-area microlens emitters for powerful THz emission (2009)
Matthäus, G., Nolte, S., Hohmuth, R., Voitsch, M., Richter, W., Pradarutti, B., ...
A microlens coupled large-area emitter based on low-temperature grown GaAs is presented. A hexagonal microlens array directs the incident pump light into every second gap of a finger electrode...
Chirped fiber Bragg gratings written with ultrashort pulses and a tunable phase mask (2009)
Voigtländer, C., Thomas, J., Wikszak, E., Dannberg, P., Nolte, S., Tünnermann, A.
We report a fabrication technique for chirped fiber Bragg gratings (CFBGs) using a flexible setup based on a poly(methyl-methacrylate) phase mask. The period of the phase mask can be thermally tuned...
Cialla, D., Siebert, R., Hübner, U., Möller, R., Schneidewind, H., Mattheis, R., ...
Surface-enhanced Raman scattering (SERS) is a potent tool in bioanalytical science because the technique combines high sensitivity with molecular specificity. However, the widespread and routine use...
Multi-channel detection of ultrashort THz-pulses based on photoconductive antennas (2009)
Freese, W., Pradarutti, B., Riehemann, S., Notni, G., Nolte, S., ...
Aspheric lens array machining and replication (2009)
Scheiding, S., Steinkopf, R., Gebhardt, A., Dannberg, P., Risse, S., Eberhardt, R., ...
The present paper describes different approaches for the machining of aspheric lens arrays. Both, Single Point Diamond Turning and micro milling are discussed. A subsequent replication process with...
Lens array manufacturing using a driven diamond tool on an ultra precision lathe (2009)
Scheiding, S., Steinkopf, R., Kolbmüller, A., Risse, S., Eberhardt, R., Tünnermann, A.
The integration of a high spced spindic onto an Ultra Precision (UP) lathe gives the ability to manufacture aspheric lens arrays with high form accuracy, bw roughness and a precise pitch control in...
Jansen, F., Nodop, D., Jauregui, C., Limpert, J., Tünnermann, A.
We report on the simulation of stimulated Raman scattering inhibition by lumped spectral filters both in passive optical transport fibers and in fiber amplifiers. The paper includes a detailed...
Rothhardt, J., Hädrich, S., Gottschall, T., Limpert, J., Tünnermann, A., Rothhardt, M., ...
We present a simple and robust pulse shaping device based on coherent pulse stacking. The device is embedded in a polarisation maintaining step index fiber. An input pulse is sent through a fiber...
Stollberg, K., Brückner, A., Duparré, J., Dannberg, P., Bräuer, A., Tünnermann, A.
We present the microoptical adaption of the natural superposition compound eye, which is termed "Gabor superlens". Enabled by state-of-the-art microoptics technology, this well known principle has...
Observation of three-dimensional discrete-continuous X waves in photonic lattices (2009)
Heinrich, M., Szameit, A., Dreisow, F., Keil, R., Minardi, S., Pertsch, T., ...
We report on the generation of three-dimensional discrete X waves in a femtosecond laser-written waveguide array. Our measurements constitute the first experimental observation of temporally...
Spectral characteristics of coupled silica disc micro resonators (2009)
Schmidt, C., Chipouline, A., Käsebier, T., Deych, L., Tünnermann, A., ...
A spectral response of coupled silica disc microresonators is investigated and light intensity distribution among the coupled discs is measured. The latter depends on the resonance frequencies of...
Nonlinearity-induced broadening of resonances in dynamically modulated couplers (2009)
Szameit, A., Kartashov, Y.V., Heinrich, M., Dreisow, F., Keil, R., Nolte, S., ...
We report the observation of nonlinearity-induced broadening of resonances in dynamically modulated directional couplers. When the refractive index of the guiding channels in the coupler is...
Adiabatic transfer of light via a continuum in optical waveguides (2009)
Dreisow, F., Szameit, A., Heinrich, M., Keil, R., Nolte, S., Tünnermann, A., ...
The optical analog of the stimulated Raman adiabatic passage via a continuum is experimentally demonstrated for photonic tunneling in femtosecond laser written waveguides. The results clearly show...
Observation of discrete solitons in lattices with second-order interaction (2009)
Szameit, A., Keil, R., Dreisow, F., Heinrich, M., Pertsch, T., Nolte, S., ...
We present what we believe to be the first experimental demonstration of discrete solitons under the influence of first- and second-order lattice site interaction in zigzag femtosecond laser-written...
Rib waveguides based on Zn-substituted LiNbO3 films grown by liquid phase epitaxy (2009)
Dubs, C., Kräußlich, J., Tünnermann, A.
The fabrication of epitaxially grown Zn-substituted LiNbO3 (Zn:LiNbO3) waveguide films and rib waveguides is reported and detailed investigations about microstructure, morphology and optical...
Kim, J.K., Kim, J., Jung, Y., Ha, W., Lee, S., ...
We report a compact all-fiber Bessel beam generator using hollow optical fiber (HOF) and coreless silica fiber based on a self-assembled polymer lens. A nearly diffraction-free Bessel beam pattern...
Circular versus linear polarization in laser-amplifiers with Kerr-nonlinearity (2009)
Schimpf, D.N., Eidam, T., Seise, E., Hädrich, S., Limpert, J., Tünnermann, A.
In this contribution it is reported that circularly polarized light is advantageous if the Kerr-effect has to be minimized during laser-amplification. The experimental demonstration is based on a...
Steinmetz, A., Nodop, D., Limpert, J., Hohmuth, R., Richter, W., Tünnermann, A.
We present a monolithic passively Q-switched microchip laser generating 200 ps pulses at a wavelength of 1064 nm with a repetition rate of up to 2 MHz. While maintaining transversal and longitudinal...
Femtosecond laser written stress-induced Nd:Y3Al5O12 (Nd:YAG) channel waveguide laser (2009)
Siebenmorgen, J., Petermann, K., Huber, G., Rademaker, K., Nolte, S., Tünnermann, A.
Single tracks and pairs of tracks were written into undoped and Nd-doped YAG crystals using a commercial femtosecond laser system delivering pulses with pulse duration of 140 fs and pulse energies up...
Observation of optical coupling in microdisk resonators (2009)
Schmidt, C., Chipouline, A., Käsebier, T., Tünnermann, A., Pertsch, T., ...
In this paper, optical properties of coupled silica disk microresonators are investigated. The spectral response and the light intensity distribution along the coupled disks were measured. It was...
Laser splicing of end caps: Process requirements in high-power laser applications (2009)
Böhme, S., Beckert, E., Eberhardt, R., Tünnermann, A.
High power fiber laser assemblies require monolithic joining technologies for low loss, mechanically stable and reliable spliced component interconnection. In contrast to conventional heat sources...
Solderjet bumping for the assembly of optical fibers (2009)
Burkhardt, T., Kamm, A., Beckert, E., Eberhardt, R., Buchmann, F., Tünnermann, A.
Further miniaturization of 3D-integrated hybrid optical systems on smart system platforms requires a fast and flexible joining technology that overcomes limitations of standard bonding processes in...
Parametric investigation of solder bumping for assembly of optical (2009)
Burkhardt, T., Hornaff, M., Beckert, E., Eberhardt, R., Tünnermann, A.
Laser based solder bumping is a highly flexible and fast approach for flux-free soldering of micro-optical components in complex 3D geometries with localized and time restricted energy input. Solder...
Wavelet filtering of fractal surfaces (2008)
Bakucz, P., Schröder, S., Krüger-Sehm, R., Duparre, A., Tünnermann, A.
Wavelet Filtering of Fractal Surfaces Light scattering measurement techniques have proved suitable tools for the practical characterization of surface nanostructures. Characteristics such as rms...
Fusion multimodaler Daten am Beispiel eines Mikrolinsen-Arrays (2008)
Regin, J., Westkämper, E., Schröder, S., Tünnermann, A., Duparre, A., Ritter, M., ...
Multimodal Data Fusion Exemplfied on a Microlens Array Merging information from different measurement procedures enables consistent and extensive characterization of 3D geometries and features....
High-power fiber lasers: Ultrafast fiber laser reaches gigawatt peak powers (2008)
Röser, F., Limpert, J., Tünnermann, A.
The power-handling capabilities of the main amplifier in a fiber laser reveal a potential performance of gigawatt peak power at megahertz repetition rate; that is a kilowatt of average power in a...
The majority of image-generating computer-generated holograms (CGHs) are calculated on a discrete numerical grid, whose spacing is defined by the desired pixel size. For single-plane CGHs the...
Single-polarization ultra-large-mode-area Yb-doped photonic crystal fiber (2008)
Schmidt, O., Rothhardt, J., Eidam, T., Röser, F., Limpert, J., Tünnermann, A., ...
We report on an ytterbium-doped single-transverse-mode rodtype photonic crystal fiber that combines the advantages of low nonlinearity and intrinsic polarization stability. The mode-field-area of the...
Novel TMA telescope based on ultra precise metal mirrors (2008)
Risse, S., Gebhardt, A., Damm, C., Peschel, T., Stöckl, W., Feigl, T., ...
Modem telescopes for space applications use complex optical elements like aspheres or freeforms. For the multispectral pushbroom scanner for spaceborne Earth remote sensing the Jena-Optonik GmbH has...
Brückner, C., Käsebier, T., Pradarutti, B., Riehemann, S., Notni, G., Kley, E.B., ...
Antireflective structures for a spectral range from 0.1-1.2 THz are applied to the surface of high resistive float zone silicon by deep reactive ion etching. Binary hexagonal and rectangular...
1 kW narrow-linewidth fiber amplifier for spectral beam combining (2008)
Wirth, C.S.O., Tsybin, I., Schreiber, T., Eberhardt, R., Limpert, J., Tünnermann, A.
We report on a narrow linewidth fiber amplifier system emitting a total output power of 1 kW. Limiting nonlinear effects like stimulated Raman and Brillouin scattering as well as self-phase...
Degenerate optical parametric amplifier delivering sub 30 fs pulses with 2GW peak power (2008)
Hädrich, S., Rothhardt, J., Röser, F., Gottschall, T., Limpert, J., Tünnermann, A.
Degenerated optical parametric amplification (OPA) is a well known technique to achieve broadband amplification necessary to generate ultrashort pulses. Here we present a parametric amplifier pumped...
Multichannel THz line detection by a microlens array excited photoconductive antenna way (2008)
Pradarutti, B., Müller, R., Matthäus, G., Freese, W., Riehemann, S., Notni, G., ...
We present multichannel THz ultrashort pulse detection by a photoconductive antenna array consisting of 16 photoconductive antennas. The efficient excitation of the photoconductive antennas has been...
Single-polarization large-mode-area Yb-doped photonic crystal fiber (2008)
Schmidt, O., Rothhardt, J., Eidam, T., Roser, F., Limpert, J., Tünnermann, A., ...
We report on an ytterbium-doped, single-polarization, single-mode large-mode-area rod-type photonic crystal fiber. The active core possesses a diameter of 70 mum and a single-polarization window...
Observation of two-dimensional lattice interface solitons (2008)
Szameit, A., Kartashov, Y.V., Dreisow, F., Heinrich, M., Vysloukh, V.A., Pertsch, T., ...
We present the first experimental evidence of two-dimensional surface solitons at the interface between femtosecond laser-written square and hexagonal waveguide arrays in fused silica.
New plasma processes for antireflective structures on plastics (2008)
Schulz, U., Munzert, P., Leitel, R., Bollwahn, N., Wendling, I., Kaiser, N., ...
A new technology based on plasma etching has been developed to produce antireflective surface structures. By choosing thin initial layers and variable plasma conditions, a broad range of...
New gluing technique rejuvenates abandoned lasers (2007)
Nodop, D., Limpert, J., Hohmuth, R., Richter, W., Guina, M., Tünnermann, A.
Two-dimensional surface lattice solitons (2007)
Szameit, A., Wang, X., Makris, K.G., Kartashov, Y.V., Pertsch, T., Nolte, S., ...
Verfahren zum Laser-gestuetzten Bonden, derart gebondete Substrate und deren Verwendung (2007)
Tünnermann, A., Eberhardt, R., Kalkowski, G., Nolte, S.
DE 102007008540 A1 UPAB: 20080906 NOVELTY - Method for laser-supported bonding of substrates comprises connecting two substrates by indirect contact and strengthening the connection between the...
Krauss, M., Leopoldsberger, G., Kalkowski, G., Eberhardt, R., Tünnermann, A., Jahnke, C., ...
DE 102007060784 A1 UPAB: 20090702 NOVELTY - Joining of two or more components that are made of glass, ceramic and/or glass ceramic by using a water glass-joining solution having sodium-, potassium-...
Position detection with hyperacuity using artificial compound eyes (2006)
Brückner, A., Duparre, J., Schreiber, P., Tünnermann, A.
Inspired by the natural phenomenon of hyperacuity, redundant sampling in combination with the knowledge about the impulse response is used to extract high resolution information like the position of...
Verschlossene, binäre Transmissionsgitter (2006)
Kley, E.B., Kämpfe, T., Clausnitzer, T., Tünnermann, A.
DE 102006036831 A1 UPAB: 20080310 NOVELTY - A closed binary transmission grating with improved efficiency diffraction is obtained using a sandwich structure with a grating bonded between upper and...
Microoptical telescope compound eye (2005)
Duparré, J., Scharf, T., Schreiber, P., Matthes, A., Pshenay-Severin, E., Bräuer, A., ...
A new optical concept for compact digital image acquisition devices with large field of view is developed and proofed experimentally. Archetypes for the imaging system are compound eyes of small...