A5049347469- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Optical Coatings and Gratings
- Laser Material Processing Techniques
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Adaptive optics and wavefront sensing
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Tribology and Lubrication Engineering
- Orbital Angular Momentum in Optics
- Advanced X-ray Imaging Techniques
- Photonic and Optical Devices
- Optical Systems and Laser Technology
- Laser-Plasma Interactions and Diagnostics
MS-Schramberg (Germany)
2021-2024
TRUMPF (Germany)
2021-2024
University of Stuttgart
2013-2021
A standardized phase retrieval algorithm is presented and applied to an industry-grade high-energy ultrashort pulsed laser uncover its spatial distribution. We describe in detail how modify the well-known order characterize particularly strong light sources from intensity measurements only. With complete information about optical field of unknown source at hand, virtual back propagation can reveal weak points path such as apertures or damaged components.
We present investigations on the extent of spectral broadening occurring during propagation laser pulses in a Thin-Disk Multipass Amplifier (TDMPA) with aim to exploit this nonlinear effect for pulse compression. The demonstrated compression 2.05 mJ-pulses duration about 136 fs FWHM at an average power 409 W and peak 9 GW is good agreement numerical simulations. Our scheme introduced additional losses below 2%, scalable powers >1 kW multi-mJ pulses, strongly enhances capabilities ultrafast...
We report on a SESAM-modelocked Yb:CaF2 thin-disk oscillator designed to generate more than 1 μJ of pulse energy at moderate repetition rate. The goal our experiment was explore the potential in laser (TDL) architecture for high power durations shorter 300 fs as compared other Yb-doped crystals exhibiting broad gain bandwidth. At rate 10 MHz produced an average output up 17.8 W (1.78 energy) with beam quality factor M2 below 1.2. duration measured be 285 fs, which results peak 5.5 MW. To...
We report on a high-power passively mode-locked radially polarized Yb:YAG thin-disk oscillator providing 125 W of average output power. To the best our knowledge, this is highest power ever reported from without subsequent amplification stages. Mode-locking was achieved by implementing SESAM as cavity end mirror and radial polarization LG*01 mode obtained means circular Grating Waveguide Output Coupler. The repetition rate 78 MHz. A pulse duration 0.97 ps spectral bandwidth 1.4 nm (FWHM)...
We report on the first demonstration of a passively (SESAM) mode-locked Yb:CaF(2) thin-disk laser operating at repetition rate 35 MHz with close to diffraction-limited beam quality (M(2) ≈ 1.1) an average output power up 6.6 W. The optical efficiency was 15.3%. Nearly transform limited pulses duration 445 fs and spectral width 2.6 nm full half maximum (FWHM) were obtained power. This corresponds pulse-energy approximately 0.19 μJ peak-power 0.4 MW.
We demonstrate ultrafast high-power laser operation, both at multi-kW average power in ultrashort-pulsed operation over extended bursts with hundreds of MHz intra-burst repetition rate from a modified TruMicro 6020 industrial laser, as well uninterrupted, quasi-CW an beyond 1 kW obtained TEM00 multipass thin-disk booster amplifier. The pulse can be varied 50 to GHz, single-pulse energies above 10 μJ and peak powers far MW without post-compressor. These systems are attractive, e.g., for...
We present the experimental investigations of different designs resonant waveguide-grating (RWG) mirrors, used as intracavity folding mirrors in an Yb:YAG thin-disk laser (TDL). The investigation was focused on rise surface temperature due to coupling incident radiation a waveguide mode well efficiency, polarization, and wavelength selectivity. It found that damage threshold efficiency can be increased significantly with proper design structure comparison simplest single layer. So far,...
We present a thin-disk multipass amplifier as power-scaling architecture for ultrafast ps and fs lasers. The system is industrially stable supports burst functionality. Only minimal CPA needed.
We report on a semiconductor saturable absorber mirror mode-locked thin-disk oscillator based Yb:YAB delivering pulses with duration of 462 fs at an average output power 19.2 W and pulse energy 0.38 µJ.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text J. Negel, S. Piehler, B. Weichelt, K. Wentsch, A. Loescher, Dannecker, M. Eckerle, Rumpel, Wolter, Voss, T. Graf, and Ahmed, "Recent progress in thin-disk lasers based various Yb-doped materials," Advanced Solid State Lasers, OSA Technical Digest (online) (Optica Publishing Group, 2014), paper AM2A.1. Export BibTex Endnote (RIS) HTML Plain alert Save article
We present a linear multipass amplifier based on the thin-disk technology which allows power scaling of continuous-wave, pulsed, and ultrashort-pulsed lasers without change beam characteristics. The flexibility seed laser, such as choice repetition rate, pulse duration, bursts is maintained. Due to large radius thin disk several millimeters, peak intensities are lower nonlinear effects play smaller role compared competing technologies fiber slab amplifiers. consists glass-welded mirror array...
We present an industrial flexible laser system utilizing fibre, rod, slab and thin-disk multipass amplifier stages to generate ultrafast pulses with 10 mJ at 1 ps or 40 120 only depending on seed source.
Zusammenfassung Thermische Effekte limitieren die Leistungsskalierbarkeit in Hochleistungsscheibenlasern und können durch konstruktive Maßnahmen nur bedingt reduziert werden. Ein neuartiger Ansatz zur Kompensation der thermisch induzierten wird den resonatorinternen Einsatz hochleistungstauglicher adaptiver Spiegel ermöglicht. In diesem Beitrag werden hierfür zwei mögliche Technologien vorgestellt charakterisiert: Während pneumatisch aktuierte Flächenlastspiegel eine gezielte bekannter...
We report on the recording of near and far field intensity beam profiles to train a convolutional neural network, which is aimed online detect system aberrations an ultrafast laser amplifier. extend state art by implementing spiral phase plate use concept diversity. It found that underlying optical in amplitude can be accurately revealed.
We present a thin-disk multipass amplifier as power scaling architecture for ultrafast lasers. 1950 W output at repetition rate of 800 kHz were achieved with pulses pre-compressed to 10 ps.
The tolerances in manufacturing of fully dielectric diffraction gratings based on the leaky-mode resonance -1st order can be challenging, especially if grating design exhibits high efficiency (DE) only within a comparatively narrow spectral bandwidth. To gain improved control bandwidth exhibiting DE, we implemented two-step etching approach fabrication process grating. First, dry and anisotropic step was used for pre-shaping grating, followed by iterative isotropic wet-etching steps using an...
We report on an approach for a compact ultrafast thin-disk multipass laser amplifier making use of highly geometric folding scheme. The setup is also suitable to minimize the effects caused by natural convection hot air in front amplified beam as it facilitates orient disk with its axis vertical direction. efficacy this analyzed finite-element method simulations heated crystal ambient different orientations thin disk. experiments confirm significant improvement performance terms stability...
Thermal lensing limits the beam quality of high-power lasers and evokes setpoint-dependent disturbances. Since these effects cannot be corrected outside resonator, intra-cavity deformable mirrors stand to reason. Based on a Gaussian cavity disturbance model with distributed parameters, we derive discrete-time estimation scheme. Due nonlinearities optical system, estimating predicting is crucial in order construct proper compensation. The presented recursive optimization-based approach...
Stress-induced birefringence leads to losses in solid-state laser resonators and amplifiers with polarized output beams. A model of stress-induced thin disks is presented, as well measurements a disk multi-kilowatt oscillator. full-Stokes imaging polarimeter was developed enable fast accurate polarimetric measurements. Experimental simulated results are good agreement qualitatively quantitatively show that the polarization loss due negligible for ytterbium-doped thickness around 100 µm but...
We present a SESAM-modelocked Yb:CaF<sub>2</sub> thin-disk laser designed for pulse durations below 300 fs and high peak powers of more than 5 MW. A cavity fundamental mode operation (beam quality factor M<sup>2</sup> 1.2) was set up modelocked using SESAM. An average output power to 17.8 W obtained at repetition-rate 10 MHz, corresponding energy approximately 1.8 μJ. The duration measured be 285 fs, therefore 5.5 MW attained. Our research enables comparison the potential Yb:CaF2 with...
We present the experimental investigations of different designs resonant waveguide-grating mirrors (RWG) which are used as intracavity folding mirror in an Yb:YAG thin-disk laser. The studied combine structured fused silica substrates, a thin-layer waveguide (Ta<sub>2</sub>O<sub>5</sub>), buffer layer (SiO<sup>2</sup>) and partial reflectors. grating period was chosen to be 510 nm allow resonances at angle incidence ~10° for TE polarization. has thickness 236 nm. It is followed by with...
The need for ultra-short (sub-ps) pulsed laser systems with high power and energy has advanced the mode-locked Ytterbium-doped thin-disk technology in last decade. Therefore several research groups have made efforts to explore new crystals e.g. Yb:SSO, Yb:CAlGO or Yb:Lu<sub>2</sub>O<sub>3</sub> generation of sub-500 fs pulses oscillators. Another promising known candidate lasers is Yb:CaF<sub>2</sub>, which been so far only used bulk architecture. In this work, we present first demonstration...
The advantages of radially and azimuthally polarized laser beams for various applications in material processing, e.g. cutting drilling, over circularly or linearly has been reported among others [1]. Furthermore, micro processing ultrafast lasers with pulse durations the order 1 ps have gained tremendous interest. oscillator we present here is a promising candidate to seed thin-disk multipass amplifier without need complex multi-stages pre-amplification scheme [2]. cavity designed such that...