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High-brightness 1.4 kW 780 nm QCW laser pump module with low-loss coupling into 1 mm fiber up to 50 % duty cycle
/en/research/publications/high-brightness-14-kw-780-nm-qcw-laser-pump-module-with-low-loss-coupling-into-1-mm-fiber-up-to-50-duty-cycle
High-brightness 1.4 kW 780 nm QCW laser pump module with low-loss coupling into 1 mm fiber up to 50 % duty cycle M. Hübner, M. Wilkens, B. Eppich, P.S. Basler,…
Progress in Experimental Studies into the Beam Parameter Product of GaAs-based High-Power Diode Lasers
/en/research/publications/progress-in-experimental-studies-into-the-beam-parameter-product-of-gaas-based-high-power-diode-lasers
Progress in Experimental Studies into the Beam Parameter Product of GaAs-based High-Power Diode Lasers P. Crumpa, M. Elattara, Md.J. Miaha, M. Ekteraia, M.M. Karowa,…
Kilowatt-class, 1-cm diode laser bars at 910-940 nm with improved power, conversion efficiency and beam quality
/en/research/publications/kilowatt-class-1-cm-diode-laser-bars-at-910-940-nm-with-improved-power-conversion-efficiency-and-beam-quality
Kilowatt-class, 1-cm diode laser bars at 910-940 nm with improved power, conversion efficiency and beam quality Md.J. Miah, A. Boni, D. Martin, A. Knigge,…
On-site shifted excitation Raman difference spectroscopy for soil investigations
/en/research/publications/on-site-shifted-excitation-raman-difference-spectroscopy-for-soil-investigations
On-site shifted excitation Raman difference spectroscopy for soil investigations M. Maiwald, K. Sowoidnich, B. Sumpf Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für…
Diode laser based light sources for shifted excitation resonance Raman difference spectroscopy in the spectral range between 450 nm and 532 nm
/en/research/publications/diode-laser-based-light-sources-for-shifted-excitation-resonance-raman-difference-spectroscopy-in-the-spectral-range-between-450-nm-and-532-nm
Diode laser based light sources for shifted excitation resonance Raman difference spectroscopy in the spectral range between 450 nm and 532 nm B. Sumpf, A. Müller, M. Braune,…
Compact plug and play optical frequency reference device based on Doppler-free spectroscopy of rubidium vapor
/en/research/publications/compact-plug-and-play-optical-frequency-reference-device-based-on-doppler-free-spectroscopy-of-rubidium-vapor
Compactness, robustness and autonomy of optical frequency references are prerequisites for reliable operation in mobile systems, on ground as well as in space. We present a standalone plug and play…
High-quality AlGaN epitaxy on lattice-engineerable AlN template for high-power UVC light-emitting diodes
/en/research/publications/high-quality-algan-epitaxy-on-lattice-engineerable-aln-template-for-high-power-uvc-light-emitting-diodes
AlGaN-based UVC light-emitting diodes (LED) were fabricated on high-quality AlN templates with an engineerable in-plane lattice constant. The controllability of the in-plane strain originated from…
Optical Feedback Generated by Tapered Amplifiers Emitting at 1120 nm
/en/research/publications/optical-feedback-generated-by-tapered-amplifiers-emitting-at-1120-nm
In this work the optical feedback generated by a tapered amplifier (TPA) emitting at 1120 nm is characterized at different operational conditions. The TPA is operated in a master oscillator…
Detection of calcium phosphate species in soil by confocal µ-Raman spectroscopy
/en/research/publications/detection-of-calcium-phosphate-species-in-soil-by-confocal-micro-raman-spectroscopy
Background: Raman spectroscopy is a promising but largely underexplored tool for the detection of phosphates (P) in soil. Although it requires minimal sample preparation, it has been demonstrated…
Au-Free Ohmic Contact for GaN High-Electron-Mobility Transistors
/en/research/publications/au-free-ohmic-contact-for-gan-high-electron-mobility-transistors-1
Herein, the fabrication of Au-free ohmic contacts for mm-wave GaN heterojunction field-effect transistors is investigated. To find an optimum metal stack and annealing recipe, different metallization…