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Structural and optical properties of ELOG a-plane GaN grown with MOVPE over different stripe directions on r-plane sapphire
/forschung/publikationen/structural-and-optical-properties-of-elog-a-plane-gan-grown-with-movpe-over-different-stripe-directions-on-r-plane-sapphire
Structural and optical properties of ELOG a-plane GaN grown with MOVPE over different stripe directions on r-plane sapphire C. Netzel, T. Wernicke, U. Zeimer, and M. Weyers …
On Compact HBT RF Noise Modeling
/forschung/publikationen/on-compact-hbt-rf-noise-modeling
Accurate RF noise modeling of heterojunction bipolar transistors requires a proper model for the correlation of the shot-noise sources based on the respective time constant. This is incompatible with…
A 2.4 GHz GaAs-HBT Class-E MMIC Amplifier with 65% PAE
/forschung/publikationen/a-24nbspghz-gaas-hbt-class-e-mmic-amplifier-with-65-pae
A class-E amplifier in the 2 GHz band is presented. It is realized as a coplanar MMIC using a high-voltage GaAs-HBT process. At 37 dBm output power, a high PAE of 65% with 71% collector…
808 nm tapered diode lasers optimised for high output power and nearly diffraction-limited beam quality in pulse mode operation
/forschung/publikationen/808nbspnm-tapered-diode-lasers-optimised-for-high-output-power-and-nearly-diffraction-limited-beam-quality-in-pulse-mode-operation
808 nm tapered lasers have been investigated under current pulsing conditions without thermal load. The pulse length was 100 ns. The lasers are based on a super-large optical cavity…
10W reliable operation of 808nm broad-area diode lasers by near-field distribution control in a multistripe contact geometry
/forschung/publikationen/10w-reliable-operation-of-808nm-broad-area-diode-lasers-by-near-field-distribution-control-in-a-multistripe-contact-geometry
High-power diode lasers operating at 808 nm and consisting of a multiple ridge-waveguide structure have been fabricated. Lasers with this structure show a more stable far and near field pattern…
670 nm semiconductor lasers for Lithium spectroscopy with 1 W
/forschung/publikationen/670-nm-semiconductor-lasers-for-lithium-spectroscopy-with-1-w
A master oscillator power amplifier system operating around 670 nm is presented. For the master laser an external cavity diode laser is used with an output power of 25 mW at tunable…
Generation of more than 300 mW diffraction-limited light at 405 nm by second-harmonic generation of a tapered diode laser with external cavity feedback
/forschung/publikationen/generation-of-more-than-300-mw-diffraction-limited-light-at-405-nm-by-second-harmonic-generation-of-a-tapered-diode-laser-with-external-cavity-feedback
We have constructed a blue laser source consisting of a single-frequency tapered diode laser with external cavity feedback that is frequency doubled by a quasi-phase matched KTP (PPKTP) in a bowtie…
Novel low-loss 3-element ring resonator for second-harmonic generation of 808nm into 404nm using periodically poled KTP
/forschung/publikationen/novel-low-loss-3-element-ring-resonator-for-second-harmonic-generation-of-808nm-into-404nm-using-periodically-poled-ktp
We present a novel ring resonator for second harmonic generation consisting of only two spherical mirrors and a refractive element. In our work we use periodically poled KTP as a nonlinear material…
Laser structures with InGaAs-QWs and n-AlGaAs/P-GaInP cladding layers for emission wavelength beyond 1100 nm
/forschung/publikationen/laser-structures-with-ingaas-qws-and-n-algaasp-gainp-cladding-layers-for-emission-wavelength-beyond-1100nbspnm
Laser structures with InGaAs-QWs and n-AlGaAs/P-GaInP cladding layers for emission wavelength beyond 1100 nm F. Bugge, U. Zeimer, G. Erbert, M. Weyers …
Optimization of HVPE growth of freestanding c-plane GaN layers using (100) γ-LiAlO2 substrates
/forschung/publikationen/optimization-of-hvpe-growth-of-freestanding-c-plane-gan-layers-using-100-g-lialo2-substrates
Freestanding c-plane GaN substrates are obtained using (100) γ- LiAlO2 substrates due to spontaneous separation during post-growth cool down. It is shown that by growth optimization the…