A5085623188- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Solid State Laser Technologies
- Laser-Matter Interactions and Applications
- Optical Network Technologies
- Advanced Fiber Optic Sensors
- Laser Design and Applications
- Laser Material Processing Techniques
- Semiconductor Lasers and Optical Devices
- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Advanced Frequency and Time Standards
- Laser-induced spectroscopy and plasma
- Pulsars and Gravitational Waves Research
- Luminescence Properties of Advanced Materials
- Spectroscopy and Laser Applications
- Planetary Science and Exploration
- Glass properties and applications
- Geophysics and Sensor Technology
- Astro and Planetary Science
- Ocular and Laser Science Research
- Cold Atom Physics and Bose-Einstein Condensates
- Additive Manufacturing and 3D Printing Technologies
- Advanced Measurement and Metrology Techniques
- Advanced Optical Sensing Technologies
Laser Zentrum Hannover
2015-2024
Phoenix Contact (Germany)
2020-2023
Infrafrontier
2020-2022
Photonics (United States)
2022
Leibniz University Hannover
2011-2020
University of New Mexico
2019
Lawrence Livermore National Laboratory
2019
Pacific Northwest National Laboratory
2019
University of Central Florida
2019
Quantum Design (Germany)
2010-2017
The use of carbon fibre-reinforced plastics (CFRP) is growing significantly in all areas lightweight construction. Thermosets like epoxy still build a major part deployed matrix material. A suitable joining technology for CFRP adhesive bonding. However, the bonding performance well reduced because contaminations. To achieve full bond-strength, adhesion to components essential. One innovative method surface pre-treatment laser radiation. Former investigations show that an important parameter...
A high-power thulium (Tm)-doped fiber chirped-pulse amplification system emitting a record compressed average output power of 152 W and 4 MW peak is demonstrated. This result enabled by utilizing Tm-doped photonic crystal fibers with mode-field diameters 35 μm, which mitigate detrimental nonlinearities, exhibit slope efficiencies more than 50%, allow for reaching pump-power-limited 241 W. The high-compression efficiency has been achieved using multilayer dielectric gratings diffraction higher 98%.
We developed an all-fiber component with a signal feedthrough capable of combining up to 6 fiber-coupled multi-mode pump sources maximum power 400 W at efficiencies in the range 89 95%, providing possibility transmitting high forward and reverse direction. Hence, fiber combiner can be implemented almost any laser or amplifier architecture. The complete optical design was based on ray tracing simulations confirmed by experimental results.
A femtosecond fiber laser based on thulium-doped double-clad silica with an internal dispersion compensation is presented that generates pulses at a center wavelength of 1976 nm energy 4.3 nJ and duration 1.2 ps. The dechirped pulse 294 fs. more than 2 orders magnitude above the demonstrated previously. Mode locking achieved using additive mode locking, facilitated by grating stretcher arrangement.
We report on stretched-pulse operation of a thulium-doped fiber laser. The laser generated pulses at center wavelength 1974 nm with an energy 4 nJ that could externally be compressed to duration 173 fs.
An ultrafast thulium-doped fiber laser with stretched-pulse operation has been realized and investigated. The passively mode-locked oscillator emitted 119 fs pulses at a peak wavelength of 1912 nm. A normal-dispersion high numerical aperture small core was used for intracavity dispersion management external compression. Numerical simulations were performed are in good agreement the experimental results.
We present a single frequency ytterbium-doped fiber amplifier, counter-propagation pumped with an all-fiber pump and signal combiner. The combiner is capable of handling 440 W power as well the maximum achieved output 301 W. threshold stimulated Brillouin scattering high-power amplifier was shifted from 175 to 280 by external thermal management in combination pump-induced intrinsic temperature gradient.
Next-generation gravitational wave detectors require single-frequency and high power lasers at a wavelength of 1.5 µm addressing set demanding requirements such as linearly-polarized TEM00 radiation with low noise to run for long periods. In this context, fiber amplifiers in MOPA configuration are promising candidates fulfill these requirements. We present monolithic Er:Yb co-doped amplifier (EYDFA) output 100 W. The EYDFA is pumped off-resonant 940 nm enhance the Yb-to-Er energy transfer...
Low noise, high power single-frequency lasers and amplifiers are key components of interferometric gravitational wave detectors.One way to increase the detector sensitivity is injected into interferometers.We developed a fiber amplifier engineering prototype with pump limited output 200 W at 1064 nm.No signs stimulated Brillouin scattering observed W.At maximum polarization extinction ratio above 19 dB fractional in fundamental transverse mode (TEM 00 ) was measured be 94.8 %.In addition,...
We report on theoretical and experimental investigations spontaneous stimulated Brillouin scattering during operation of a high-power single-frequency polarization-maintaining ytterbium doped fiber amplifier. For different amplifier configurations with co- counter-propagating seed pump radiation the evolution spectra was investigated heterodyne detection scheme. Spontaneous gain at low powers were additionally using pump-probe technique. The data obtained from these experiments have been...
We report on a passively mode-locked femtosecond fiber oscillator using only fiber-based components without intracavity dispersion compensation. The all-normal laser operates in the dissipative-soliton regime and utilizes spectral filter for pulse shaping. 3.8 ps long pulses with energies of 3.6 nJ can be dechirped grating compressor to 76 fs. output spectrum reveals full width at half maximum 39.7 nm center wavelength 1032 nm. repetition rate is 71 MHz. influence energy variation discussed.
Gain dynamics and refractive index changes in fiber amplifiers are important many areas. For example, the knowledge of frequency responses for seed pump power modulation required to actively stabilize low noise amplifiers. Slow fast light via coherent population oscillations rely on change group delay or advance pulses, a possible explanation mode fluctuations high Here, we analyze dependent influence amplifier output index. We explain observed with an analytic model originally developed...
We report on monotonically positively chirped pulse operation of a hybridly mode-locked thulium fiber laser. Dispersion management was realized with small-core, high-NA providing normal dispersion in the 2 μm wavelength region. The laser delivered pulses 0.7 nJ energy at 1927 nm center and sub-500-fs duration after compression.
At the beginning of 2016, first direct detection a gravitational wave by laser-based Michelson interferometer has been reported. So far, number confirmed detections raised to three and will certainly increase further. Thereby, mankind an amazing new tool observe study universe, namely astronomy. However, in order develop their full potential, more sensitive generation earth-bound detectors be required future. Current are operating with solid-state laser systems at 1064 nm but higher output...