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Broadband and sensitive Terahertz (THz) emitter and detector material is required to build cost-effective and mobile THz time-domain spectrometer systems (TDS). We present an efficient THz switch optimized for femtosecond lasers operating at the central wavelength of about 1060 nm. Performance is improved by a factor of 20 due to the implementation of mesa structuring and utilization of low temperature...
Terahertz antennas for 1.5 μm operation are improved by mesa-etching of the InGaAs/InAlAs photoconductive layers. The performance in terms of dark current, signal amplitude and bandwidth has been improved significantly.
Nanocrystalline ZnO powders can act as gain and scattering medium in a random laser where the light emission can be strongly amplified. In this work, we compare the luminescence properties of samples with different particle sizes in the regime of linear and nonlinear optics. In the high-excitation regime random lasing is observed in all samples. Here, the lasing threshold depends strongly on the size...
We present an experimental procedure to directly extract the degree of localization of random laser modes in ZnO powders. Strongly localized and extended modes are found to coexist within the same ensemble area.
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