A5030772966- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Laser Material Processing Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photonic Crystal and Fiber Optics
- Optical Coatings and Gratings
- Laser Design and Applications
- Silicon Nanostructures and Photoluminescence
- Diamond and Carbon-based Materials Research
- Surface Roughness and Optical Measurements
- Thin-Film Transistor Technologies
- Semiconductor Lasers and Optical Devices
- Ion-surface interactions and analysis
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Quantum Chemical Studies
Ludwig-Maximilians-Universität München
2017-2024
Peking University
2019
Thin films of Ge, ZnS, YbF3, and LaF3 produced using e-beam evaporation on ZnSe Ge substrates were characterized in the range 0.4-12 µm. It was found that Sellmeier model provides best fit for refractive indices substrate, films; Cauchy YbF3 film. Optical constants substrate film as well extinction coefficients LaF3, are presented frame a non-parametric model. For coefficient exponential is applicable. Stresses estimated equal to (-50)MPa, (-400)MPa, 140 MPa, 380 respectively. The surface...
Electro-optic sampling of infrared electric fields has set sensitivity and dynamic-range records in broadband molecular vibrational spectroscopy. Yet, these works, the 1-second-scale single-trace acquisition time leads to intra-scan noise accumulation restricts throughput measurements multiple samples dynamic processes. We present a dual-laser-oscillator approach capturing 2800 mid-infrared waveforms per second by scanning relative delay between sampled waveform gate pulses using modulated...
Broadband dispersive mirrors operating in the mid-infrared spectral range of 6.5-11.5 μm are developed for first time, to best our knowledge. The comprise Ge and YbF3 layers, which have not been used before manufacturing multilayer optics. design production processes described; mechanical stresses coatings estimated based on experimental data; phase properties produced measured. compensate group delay dispersion ultrashort laser pulses accumulated by propagation through 4 mm ZnSe windows...
The Technological Laboratory of LMU Munich supplies various types solid-state target for laser plasma experiments at the Centre Advanced Laser Applications in Garching. Our main focus here is on production free-standing, thin foil targets, such as diamond-like-carbon foils, carbon nanotube foams (CNFs), plastic, and gold foils. presented methods comprise cathodic arc deposition DLC chemical vapor CNFs, a droplet spin-coating process plastic production, well physical that has been optimized...
Complementary pair of dispersive multilayers operating in the 2-4 µm spectral range were designed and produced for first time. The mirrors comprise layers Si SiO2 thin-film materials. exhibits unparalleled reflectance exceeding 99.7% provides a group delay dispersion (-200) fs2. can be used Cr:ZnS/Cr:ZnSe femtosecond lasers amplifiers.
Abstract We have compared two kinds of dispersive mirrors (DMs) produced by magnetron sputtering and ion beam sputtering. One them is a broadband DM which known as double-angle DM, providing group delay dispersion (GDD) $$-40 \mathrm{{fs}}^2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>-</mml:mo><mml:mn>40</mml:mn><mml:msup><mml:mrow><mml:mi>fs</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:math> in the range 550–1050 nm. The other one robust...
A new broadband dispersive mirror (DM), which consists of Si and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">S</mml:mi> mathvariant="normal">i</mml:mi> mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> layer materials operating in the spectral range 3–6 µm, is developed for first time, to our knowledge. The DM able compensate dispersion a 0.5 mm thick...
We report a novel one-coating-run method for producing an octave-spanning complementary dispersive mirror (DM) pair. The anti-phase group delay dispersion (GDD) oscillations are realized by two mirrors of the DM pair due to certain thickness difference. Both deposited within single coating run enabled non-uniformity ion beam sputtering plant, which is obtained tuning distance between source target and substrates. Since produced in deposition run, GDD performance more robust against errors...
We demonstrate the design, production, characterization and application of two dispersive complementary mirror pairs compensating second- third-order dispersion, respectively. Both operate in spectral range from 1.2-3.2µm. This is an unprecedented bandwidth over 1.4 octaves which can drive further improvements Cr:ZnS, Cr:ZnSe other laser systems with a central wavelength around 2µm. The first pair provides constant group delay dispersion -100fs2, while second one enables compensation that...
Irradiating thin foils with very intense laser pulses results in the emission of swift ion bunches. These laser-accelerated ions exhibit properties that substantially differ from conventionally accelerated particles. A large number a variety species distributed over broad energy and angular spectrum are confined to short bunch durations sought enable novel applications [1]. For many years these have been studied optimized mainly by investigating interaction process lasers plasmas exemplary...
Development of modern mid-infrared laser applications requires high-quality optical elements operating in the broadband spectral ranges from visible to 15 um. ZnS/YbF3 coatings on ZnSe substrates are perspective candidates for such since these thin-film materials and substrate transparent this region provide sufficient refractive index contrast. Experiments demonstrate that spectra multilayers glass shifted with respect each other significantly. This issue plays a key role monitoring concept...
In optical experiments involving variably-delayed ultrashort pulses, the precise calibration of delay axis is paramount importance. This particularly challenging if interferometric tracking (with an auxiliary, monochromatic laser [1] ) cannot readily be implemented, such as in case when pulses originate from separate modelocked oscillators with detuned repetition frequencies. new scheme electro-optic [2] (i) optical-phase-stable mid-infrared (MIR) waveform obtained via intrapulse difference...
Si, DyF3, MgF2, and MgO thin films produced by electron-beam evaporation on ZnSe substrates were characterized in spectral ranges from 0.4-0.6 um to 10-14 µm. Optical constants of Si are described a non-parametric model.
Our real-time study of nonlinearities in solids demonstrates that ultrafast light fields can transform nickel from a conducting to semiconducting material, while silicon be turned an indirect direct band-gap absorber.
We present a novel one octave complementary dispersive mirror pair from 500 to 1050nm. It is realized within coating run based on the desired and tunable non-uniformity of ion beam sputtering.
A novel ultra-broadband beamsplitter operating in the near-infrared range around 1030 nm and mid-infrared 3-12 µm for bio-medical laser applications was designed produced. Thin-film materials were ZnS YbF 3 .
A third-order dispersion compensating mirror pair was designed, produced and characterized. It covers the spectral range from 1.2-3.2µm. This is shown by application in a Cr:ZnS laser system.
A novel multilayer elongation optical element is developed, produced, and characterized. The elongates a mid-infrared pulse provides monochromatic waveform for electro-optic delay tracking.
Multilayer optical components for ultrafast laser applications operating in the mid-infrared (MIR) spectral range from 3 to 15 μm exhibit and physical properties essentially different those ones of coatings visible-near-infrared range, namely, they should (i) comprise layers special MIR thin-film materials; (ii) contain much thicker layers; (iii) deal with adhesion problems due high stresses; (iv) regions O-H absorption range; (v) positive group delay dispersion; (vi) be ultra-broadband...