2016

show Content S. Breitkopf et al., "Extraction of enhanced , ultrashort laser pulses from a passive 10- MHz stack-and-dump cavity, " Appl. Phys. B-Lasers and Optics 122 (2016).

Abstract

Periodic dumping of ultrashort laser pulses from a passive multi-MHz repetition-rate enhancement cavity is a promising route towards multi-kHz repetition-rate pulses with Joule-level energies at an unparalleled average power. Here, we demonstrate this so-called stack-and-dump scheme with a 30-m-long cavity. Using an acousto-optic modulator, we extract pulses of 0.16 mJ at 30-kHz repetition rate, corresponding to 65 stacked input pulses, representing an improvement in three orders of magnitude over previously extracted pulse energies. The ten times longer cavity affords three essential benefits over former approaches. First, the time between subsequent pulses is increased to 100 ns, relaxing the requirements on the switch. Second, it allows for the stacking of strongly stretched pulses (here from 800 fs to 1.5 ns), thus mitigating nonlinear effects in the cavity optics. Third, the choice of a long cavity offers increased design flexibility with regard to thermal robustness, which will be crucial for future power scaling. The herein presented results constitute a necessary step towards stack-and-dump systems providing access to unprecedented laser parameter regimes.

doi:10.1007/s00340-016-6574-x

show Content C. Gaida, M. Gebhardt, F. Stutzki, C. Jauregui, J. Limpert, A. Tünnermann, "Thulium-doped fiber chirped-pulse amplification system with 2 GW of peak power," Opt. Lett. 41 (17), 4130-4133 (2016).

Abstract

Thulium-doped fibers with ultra large mode-field areas offer new opportunities for the power scaling of mid-IR ultrashort-pulse laser sources. Here, we present a laser system delivering a pulse-peak power of 2 GW and a nearly transform-limited pulse duration of 200 fs in combination with 28.7 W of average power. This performance level has been achieved by optimizing the pulse shape, reducing the overlap with atmospheric absorption lines, and incorporating a climate chamber to reduce the humidity of the atmospheric environment.

doi:10.1364/OL.41.004130

show Content S. Hädrich et al., "Energetic sub-2-cycle laser with 216 W average power," Opt. Lett. 41, 4332 (2016).

Abstract

Few-cycle lasers are essential for many research areas such as attosecond physics that promise to address fundamental questions in science and technology. Therefore, further advancements are connected to significant progress in the underlying laser technology. Here, two-stage nonlinear compression of a 660 W femtosecond fiber laser system is utilized to achieve unprecedented average power levels of energetic ultrashort or even few-cycle laser pulses. In a first compression step, 408 W, 320 μJ, 30 fs pulses are achieved, which can be further compressed to 216 W, 170 μJ, 6.3 fs pulses in a second compression stage. To the best of our knowledge, this is the highest average power few-cycle laser system presented so far. It is expected to significantly advance the fields of high harmonic generation and attosecond science.

doi:10.1364/QL.41.004332

show Content R. Klas, S. Demmler, M. Tschernajew, S. Hädrich, Y. Shamir, A. Tünnermann, J. Rothhardt, J. Limpert, "Table-top milliwatt-class extreme ultraviolet high harmonic light source," Optica 3, 1167-1170 (2016).

Abstract

Extreme ultraviolet (XUV) lasers are essential for the investigation of fundamental physics. Especially high repetition rate, high photon flux sources are of major interest for reducing acquisition times and improving signal-to-noise ratios in a plethora of applications. Here, an XUV source based on cascaded frequency conversion is presented, which, due to the drastic better single atom response for short wavelength drivers, delivers an average output power of (832±204)  μW at 21.7 eV. This is the highest average power produced by any high harmonic generation source in this spectral range, surpassing previous demonstrations by almost an order of magnitude. Furthermore, a narrowband harmonic at 26.6 eV has been generated that is of high interest for high-precision spectroscopy experiments.

doi:10.1364/OPTICA.3.001167

show Content M. Müller, M. Kienel, A. Klenke, T. Gottschall, E. Shestaev, M. Plotner, J. Limpert, and A. Tünnermann, "1 kW 1 mJ eight-channel ultrafast fiber laser," Opt. Lett. 41, 3439 (2016).

Abstract

An ultrafast fiber chirped-pulse amplifier comprising eight coherently combined amplifier channels is presented. The laser delivers 1 kW average power at 1 mJ pulse energy and 260 fs pulse duration. Excellent beam quality and low-noise performance are confirmed. The laser has proven suitable for demanding scientific applications. Further power scaling is possible right away using even more amplifier channels.

doi:10.1364/OL.41.003439

show Content J. Rothhardt et al., "High-repetition-rate and high-photon-flux 70 eV high-harmonic source for coincidence ion imaging of gas-phase molecules," Opt. Lett. 41, 3439 (2016).

Abstract

Unraveling and controlling chemical dynamics requires techniques to image structural changes of molecules with femtosecond temporal and picometer spatial resolution. Ultrashort-pulse x-ray free-electron lasers have significantly advanced the field by enabling advanced pump-probe schemes. There is an increasing interest in using table-top photon sources enabled by high-harmonic generation of ultrashort-pulse lasers for such studies. We present a novel high-harmonic source driven by a 100 kHz fiber laser system, which delivers 1011 photons/s in a single 1.3 eV bandwidth harmonic at 68.6 eV. The combination of record-high photon flux and high repetition rate paves the way for time-resolved studies of the dissociation dynamics of inner-shell ionized molecules in a coincidence detection scheme. First coincidence measurements on CH3 I are shown and it is outlined how the anticipated advancement of fiber laser technology and improved sample delivery will, in the next step, allow pump-probe studies of ultrafast molecular dynamics with table-top XUV-photon sources. These table-top sources can provide significantly higher repetition rates than the currently operating free-electron lasers and they offer very high temporal resolution due to the intrinsically small timing jitter between pump and probe pulses.

doi:10.1364/OE.24.018133

show Content G.K. Tadesse, R. Klas, S. Demmler, S. Hädrich, I. Wahyutama, M. Steinert, C. Spielmann, M. Zurch, T. Pertsch, A. Tünnermann, J. Limpert, J. Rothhardt, "High speed and high resolution table-top nanoscale imaging," Opt. Lett. 41 , 5170-5173 (2016).

Abstract

We present a table-top coherent diffractive imaging (CDI) experiment based on high-order harmonics generated at 18 nm by a high average power femtosecond fiber laser system. The high photon flux, narrow spectral bandwidth, and high degree of spatial coherence allow for ultrahigh subwavelength resolution imaging at a high numerical aperture. Our experiments demonstrate a half-pitch resolution of 15 nm, close to the actual Abbe limit of 12 nm, which is the highest resolution achieved from any table-top extreme ultraviolet (XUV) or x-ray microscope. In addition, sub-30 nm resolution was achieved with only 3 s of integration time, bringing live diffractive imaging and three-dimensional tomography on the nanoscale one step closer to reality. The current resolution is solely limited by the wavelength and the detector size. Thus, table-top nanoscopes with only a few-nanometer resolutions are in reach and will find applications in many areas of science and technology.

 doi:10.1364/OL.41.005170

show Content C. Voigtländer, R. G. Krämer, T. A. Goebel, D. Richter, and S. Nolte, "Variable wavefront tuning with a SLM for tailored femtosecond fiber Bragg grating inscription," Opt. Lett. 41, 17 (2016)

Abstract

We report on the inscription of fiber Bragg gratings using femtosecond laser pulses and the phase-mask technique. The wavefront of the inscription laser is variably tuned with a spatial light modulator (SLM). By applying Fresnel lenses with different focal lengths, the period of the fiber Bragg gratings could be shifted. A linear change of the grating period for a FBG inscribed with a third-order deformed wavefront and a quadratic-period behavior for a fourth-order wavefront could be verified experimentally for the first time.

 doi:10.1364/OL.41.000017

show Content Presentations at conferences

Talks

  • F. G. Fröbel, "Theoretical Modeling of Nonlinear Optics in Gas-filled Hollow-core Fibers in the Near and Mid-IR - An Introduction,"  Institute for Physical Chemistry, Jena (Feb 2016).

  • F. G. Fröbel, "Theoretical Modeling of Nonlinear Optics in Gas-filled Hollow-core Fibers in the Near and Mid-IR - Status Report, " Abbe School of Photonics, Jena (July 2016).

  • F. G. Fröbel, "Theoretical Modeling of Nonlinear Optics in Gas-filled Hollow-core Fibers in the Near and Mid-IR,"  GRK2101 Summer School, Abbe School of Photonics, Jena (Sep 2016).

  • S. Demmler, T. Eidam, S. Breitkopf, M. Kienel, A. Klenke, M. Müller, F. Stutzki,  H.-J.  Otto, C. Gaida, M. Gebhardt,  G. Tadesse,  T. Gottschall, C. Jauregui, S. Hädrich, J. Rothhardt, T. Schreiber, J. Limpert, A. Tünnermann, "Advances in High Repetition Rate Ultrafast Lasers - Novel Avenues in Science and Industry," HPLA/DE (High Power Laser Ablation and Directed Energy), Santa Fe USA ( 2016).
  • M. Gebhardt, C. Gaida, F. Stutzki, S. Hädrich, C. Jauregui, J. Limpert, and A. Tünnermann, "Self-compression to 24 MW peak power in a fused silica solid-core fiber using a high-repetition rate thulium-based fiber laser system," Photonics West LASE, San Francisco USA (2016).

  • M. Gebhardt, C. Gaida, R. Klas, F. Stutzki, S. Hädrich, S. Demmler, J. Rothhardt, C. Jauregui, J. Limpert, and A. Tünnermann, " High-power nonlinear compression stage delivering sub-50 fs, 0.25 mJ pulses, 15 W at 2 μm wavelength for HHG," ASSL, LSC, LAC, Boston USA (2016).

  • C. Gaida, M. Gebhardt, F. Stutzki, H.-J.  Otto, C. Jauregui, J. Limpert, A. Tünnermann," Average power scaling of ultrashort-pulse Tm-based fiber laser systems," Photonics West LASE, San Francisco USA (2016).

  • C. Gaida, M. Gebhardt, F. Stutzki, S. Hädrich, C. Jauregui, J. Limpert, A. Tünnermann, "High average power GW-level few-cycle pulses at 2 µm wavelength for high photon energy HHG," HILAS; Los Angeles USA (2016).

  • M. Chemnitz, M. Gebhardt, C. Gaida, F. Stutzki, J. Limpert, M. A. Schmidt, "Indications of new solitonic states within mid-IR supercontinuum generated in highly non-instantaneous fiber," CLEO, San Jose USA (2016).

  • F. Stutzki, C. Gaida, M. Gebhardt, R. Klas, S. Demmler, S. Hädrich, J. Rothhardt, C. Jauregui, J. Limpert, and A. Tünnermann, "Nonlinear pulse compression and high-harmonic generation driven by a high repetition rate Tm-based fber CPA system," Europhoton Conference, Vienna Austria (2016).

  • C. Gaida, F. Stutzki, M. Gebhardt, C. Jauregui, J. Limpert, and A. Tünnermann, "Prospects for peak power scaling of Tm-doped fiber CPA systems," ASSL, LSC, LAC,  Boston USA (2016).

  • M. Heck, "Femtosecond laser pulse written Long Period Gratings with minimal out-of-band losses," DokDok (2016).

  • M. Kienel, S. Hädrich, M. Müller, A. Klenke, J. Rothhardt, R. Klas, T. Gottschall, T. Eidam, A. Drozdy, P. Jójárt, Z. Várallyay, E. Cormier, K. Osvay, A. Tünnermann, and J. Limpert, "Few-cycle Laser with 216 W Average Power and 6.3 fs Pulses," ASSL, LSC, LAC, Boston USA (2016).

  • J. Rothhardt, R. Klas, M. Tschernajew, S. Demmler, A. Tünnermann, J. Limpert, "Development of high-repetition rate XUV lasers for storage-ring experiments, " 11th SPARC topical Workshop, Krakow Poland (2016)

  • J. Rothhardt, G. K. Tadesse, S. Hädrich, R. Klas, S. Demmler, J. Limpert and A. Tünnermann, "Fiber-laser based high harmonic sources for nanoscale imaging and spectroscopy , " Frontiers in Optics Conference, Rochester USA (2016).

  • J. Rothhardt, G. K. Tadesse, S. Hädrich, R. Klas, S. Demmler, J. Limpert and A. Tünnermann, "Nanoscale imaging with high photon flux table-top XUV sources," IEEE Photonics Conference, Waikoloa USA (20016).

  • S. Demmler, R. Klas, M. Tschernajew, S. Hädrich, J. Rothhardt, J. Limpert, A. Tünnermann, "Narrowband High Harmonic Source with Multi-mW Average Power Based on Cascaded Frequency Conversion," Ultrafast Phenomena, Santa Fe USA (2016).

  • S. Demmler, R. Klas, M. Tschernajew, S. Hädrich, J. Rothhardt, J. Limpert, A. Tünnermann, "mW Average Power Narrowband High Harmonic Sources," in High-Brightness Sources and Light-Driven Interactions (HILAS), Los Angeles USA (2016).

  • R. Klas, S. Demmler, M. Tschernajew, S. Hädrich, J. Rothhardt, J. Limpert, A. Tünnermann, "Milliwatt Class Narrowband High Harmonic Source Based on Cascaded Frequency Conversion," Europhoton Conference, Vienna Austria (2016).

  • G.K. Tadesse, R. Klas, S. Demmler, S. Hädrich, I. Wahyutama, M. Zürch, M. Steinert, C. Spielmann, A. Tünnermann, J. Limpert  and J. Rothhardt, "High photon flux 70 eV high harmonic source for coherent nanoscale imaging," Europhoton Conference, Vienna Austria (2016).

  • G.K. Tadesse, R. Klas, S. Demmler, S. Hädrich, I. Wahyutama, M. Zürch, C. Spielmann, A. Tünnermann, J. Limpert and J. Rothhardt, "Sub-20 nm Resolution Coherent Diffractive Imaging with a Table-Top XUV Source," Coherence Conference, Saint Malo France (2016).

  • G.K. Tadesse, R. Klas, S. Demmler, S. Hädrich, I. Wahyutama, M. Zürch, C. Spielmann, A. Tünnermann, J. Limpert and J. Rothhardt, "Table-top coherent diffractive imaging – towards sub-10 nm resolution," X-Ray Microscopy Conference (XRM), Oxford UK (2016).

  • S. Hädrich, M. Kienel, M. Müller, A. Klenke, J. Rothhardt, R. Klas, T. Gottschall, T. Eidam, A. Drozdy, P. Jojart, Z. Varallyay, E. Cormier, K. Osvay, A. Tünnermann, J. Limpert, "Utilizing fiber lasers to obtain 220W average power energetic sub 2-cycle pulses," Europhoton Conference, Vienna Austria (2016).

  • R. Klas, S. Hädrich, J. Rothhardt, J.Limpert, A. Tünnermann, M. Aeschlimann, M. Barkowski, S. Sadashivaiah, J. Urbancic, S. Mathias, "High Photon Flux 70 eV HHG Source for Ultrafast Dynamics," Ultrafast Phenomena, Santa Fe USA (2016).

  • F. Löchner,  "Second-harmonic generation in MoS2 monolayers coupled to resonant nanoantennas," DPG-Frühjahrstagung Regensburg, Germany  (March 2016).

  • S. Weimann, M. Kremer, L. Maczewsky, J. M. Zeuner, Y. Plotnik, Y. Lumer, K. G. Makris, M. Segev, M.S. Rudner, S. Nolte, M. C. Rechtsman, A. Szameit, " Non-Hermitian Photonics,"  at META conference , Malaga Spain (July 2016).

  • R. Heilmann, M.Gräfe, L. Maczewsky, S. Nolte, A. Szameit, "A highly precise characterization technique for integrated photonic devices," at CLEO , San Jose  California (June 2016).

  • R. Keil, C. Noh, A. Rai, L. Maczewsky, S. Stützer, S. Nolte, D. G. Angelakis, A, Szameit, "Optical simulations of unphysical Majorana dynamics,"  at CLEO , San Jose California (June 2016).

  • S. Weimann, M. Kremer, L. Maczewsky, J. M. Zeuner, Y. Plotnik, Y. Lumer, K. G. Makris, M. Segev, M.S. Rudner, S. Nolte, M. C. Rechtsman, A. Szameit,  "Non-Hermitian Photonics," at DokDok conference , Malaga Spain (Sep 2016).

  • S. Breitkopf, S. Wunderlich, T. Eidam, E. Shestaev, T. Gottschall, H. Carstens, S. Holzberger, T. Gottschall, H. Carstens, A. Tünnermann, I. Pupeza, and J. Limpert, "Extraction of enhanced, ultrashort laser pulses from a passive 10- MHz stack-and-dump cavity,"  Europhoton Conference, Vienna Austria (2016).

  • S. Breitkopf, S. Wunderlich, T. Eidam, E. Shestaev, T. Gottschall, H. Car- stens, S. Holzberger, I. Pupeza, J. Limpert, and A. Tünnermann, "Investigation of a 10 MHz, non-steady state cavity for pulse energy enhancement of ultrafast fiber lasers," Photonics West LASE, San Francisco USA (2016).

  • A. Klenke, M. Kienel, M. Müller, T. Gottschall, S. Breitkopf, E. Shestaev, C. Jauregui, J. Rothhard, T. Eidam, S. Hädrich, J. Limpert,  A. Tünnermann, "Coherent combination of fiber lasers ," ICUIL, Montebello Canada (2016).

  • A. Klenke, M. Kienel, M. Müller, T. Gottschall, S. Breitkopf, E. Shestaev, C. Jauregui, J. Rothhard, T. Eidam, S. Hädrich, J. Limpert,  A. Tünnermann, "Leistungssteigerungskonzepte für Femtosekundenfaserlaser," Optische Fasern - Aktuelle Trends und zukünftige Entwicklungen, Nürnberg Germany (2016).

  • M Müller, M. Kienel, A. Klenke, T. Gottschall, E. Shestaev, J. Limpert, A. Tünnermann, " 11.7 mJ pulse energy kW-class average power 8-channel ultrafast fibre laser," Europhoton, Vienna Austria (2016).
  • C. Stihler, C. Jauregui, H.-J. Otto, J. Limpert and A.Tünnermann," The impact of photodarkening on the mode instability threshold," DokDok 2016, Oppburg Germany (2016).

  • C. Stihler, C. Jauregui, H.-J. Otto, J. Limpert and A.Tünnermann,"The impact of photodarkening on the mode instability threshold," GRK 2101 - Summer School, Jena Germany (2016). 

  • C. Jauregui, H.-J. Otto, C. Stihler, J. Limpert, A. Tünnermann, "Thermal optimization of high power fiber laser systems," Laser Optics, St. Petersburg Russia (2016).
  • M.Zürch, R. Sollapur, A. Hoffmann, G. Sauer, A. Hartung, D. Kartashov, M. Schmidt,  C. Spielmann, „Octave Broadband Supercontinuum Generation in Gas-Filled Anti-Resonant Hollow-Core Fiber“, CLEO  invited presentation (2016).

  • R. Sollapur, D. Kartashov, M. Zürch, A. Hoffmann, T. Grigorova, G. Sauer, A. Hartung, A. Schwuchow, J. Bierlich, J. Kobelke, M. A. Schmidt, C. Spielmann, “Multi-octave supercontinuum generation in anti-resonant hollow core fibers”, Summer School of the GRK 2101, Abbe Center of Photonics, Jena Germany (2016).

Poster

  • R. Sollapur, M.Zürch,  A. Hoffmann, G. Sauer,  D. Kartashov, M. Schmidt,  C. Spielmann, "Nonlinear optics in gas-filled hollow-core fibers in the near and mid-IR,“  DokDok student conference (2015).

  • R. Sollapur, M.Zürch,  A. Hoffmann, G. Sauer,  D. Kartashov, M. Schmidt,  C. Spielmann, "Nonlinear optics in gas-filled hollow-core fibers in the near and mid-IR,” German Canadian Workshop, University of Toronto Canada (2015).

  • R. Sollapur, M.Zürch,  A. Hoffmann, G. Sauer,  D. Kartashov, M. Schmidt,  C. Spielmann, "Nonlinear optics in gas-filled hollow-core fibers in the near and mid-IR”, The international Workshop “New Frontiers in Fiber Optics” , Leibniz Institute of Photonic Technology, Jena Germany (2016).

  • R. Sollapur, M.Zürch,  A. Hoffmann, G. Sauer,  D. Kartashov, A. Hartung, M. Schmidt,  C. Spielmann, "Multi-octave supercontinuum generation in gas-filled anti-resonant hollow-core fiber”, Siegman International School on Lasers, The Institute of Photonic Sciences, Barcelona Spain (2016).

  • A. Hoffmann, M. Zürch, R. Sollapur, D. Kartashov, T. Grigorova, G. Sauer, A. Hartung, M. Schmidt, ChriC.stian Spielmann, "Scaling supercontinuum generation in gas-lled hollow-core fibers “, Europhoton (2016).

  • T. Grigorova, R. Sollapur, A. Hoffmann, M. Schmidt, A. Hartung, M. Schmidt, C. Spielmann, "Dispersion measurements of a novel anti-resonant hollow-core fiber, “ DokDok student conference (2016).

 

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