A5072294837- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Advanced Chemical Sensor Technologies
- Photorefractive and Nonlinear Optics
- Spectroscopy and Laser Applications
- Photoacoustic and Ultrasonic Imaging
- Nanofabrication and Lithography Techniques
- Advanced Sensor Technologies Research
- Luminescence and Fluorescent Materials
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Laser Material Processing Techniques
- Photonic and Optical Devices
- Advanced Optical Sensing Technologies
- Nonlinear Optical Materials Studies
Laser Zentrum Hannover
2020-2022
Technische Universität Braunschweig
2017
HAW Hamburg
2014
Photonic nanostructures are created in organo-metal halide perovskites by thermal nanoimprint lithography at a temperature of 100 °C. The imprinted layers significantly smoothened compared to the initially rough, polycrystalline and impact surface defects is substantially mitigated upon imprint. As case study, 2D photonic crystals shown afford lasing with ultralow thresholds room temperature.
We developed a visible-red to near-infrared wavelength tunable all-solid-state laser system utilizing an optical parametric generation process in MgO doped PPLN crystal pumped at 532 nm by amplified and frequency doubled picosecond passively Q-switched Nd:YVO4 microchip laser. A broad bandwidth, tuneable over 300 between 710 1015 nm, is accessible. Depending on the green pump light pulse energy, pulses with durations down 69 ps as well energies above 2 µJ were achieved kHz repetition rates.
2D photonic crystals (2D-PCs) are directly patterned into methylammonium lead iodide perovskite layers by thermal nanoimprint lithography (NIL) at moderate temperatures of only 100 °C, as described in article number 1605003 Thomas Riedl and co-workers. The imprinted significantly smoothened surface defects eliminated upon imprint. 2D-PCs afford lasing with ultra-low thresholds 3.8 μJ/cm2 room temperature, which is indicative excellent material quality the after
In Photo usually u new com converte embedde needed t improvem micropho
We present a monolithic integrated passively Q-switched sub-150 ps microchip laser at 1064 nm with wedged Nd:YVO 4 crystal operating up to repetition rate of 1 MHz. The wedge enables change the cavity length by small amount fine tune spectral mode position over full gain bandwidth and hence optimize output power. This additional degree freedom may be suitable approach increase wafer scale mass production yield or also simplify frequency tuning CW single-frequency lasers.
We developed a red to near infrared continuous tunable laser system seeded by picosecond passively Q-switched microchip at 1064 nm. Pulse duration below 150 ps and pulse energy > 700 nJ with kHz repetition rate were achieved.
The recently re-discovered class of organometal-halide perovskites hold great promise for solar cells, LEDs and lasers.[1] Today, their potential has not been fully unlocked partially because the lack suitable nano-patterning techniques, which are mandatory to create resonator structures, waveguides etc. with a maximum level precision directly into perovskite layers. Their chemical thermal instability prevents use established wet-chemical patterning techniques.[2] In contrast conventional...