Far-UVC LEDs are attractive for applications like monitoring of gas concentrations and measurement of nitrite in water. FBH and TU Berlin have developed 233 nm AlGaN-based far-UVC LEDs with previously unattained emission power and lifetime – based on comprehensive optimizations within the LED fabrication chain.
FBH has successfully realized a D-band up-converter (between 110 and 170 GHz). The MMIC was manufactured on the in-house InP DHBT transfer-substrate process with feature sizes down to 250 nm. The up-converter achieved 17 dB peak conversion gain with DC power consumption as low as 25 mW.
The FBH developed with BTU Cottbus-Senftenberg a compact model to bridge the gap between experiment and modeling of semiconductor devices. Therefore, the ASM-HEMT physics-based compact model has been enhanced with a drain-lag implementation.
Atomic quantum sensors enable the measurement of e.g. accelerations or external fields with unprecedented precision. FBH works on miniaturized optical setups to further integrate atom-chip based sensors combined with conceptual studies on the cold atom preparation in hybrid traps.
The multi-emitter source is ideally suited for autonomous driving, generating high peak power and pulses in the nanosecond range. Short pulses guarantee both high spatial resolution and eye safety.
High-power diode lasers based on GaAs are the most efficient light sources for converting electrical input to optical power. For making them even more efficient, FBH continued its work to understand and overcome power limiting factors.
To reduce power consumption of optoelectronic devices FBH conducts researches to lower contact resistance between the contact and the semiconductor material. Focus is the contact system at the Pd/gallium nitride (GaN) interface.
FBH has realized a compact micro-integrated laser module for a transportable, robust, and user-friendly optical clock to be operated outside specialized labs. The clock itself is based on the 2S1/2-2D3/2 transition of a single 171Yb+ ion at 436 nm.
FBH has developed an ultra-compact microwave plasma source for atmospheric pressure. It delivers a potential-free microwave plasma with a plasma power in the 15 to 20 W range, which is sufficient for many applications.
To treat eye diseases, laser coagulation with laser emission at 532 nm is widely used. For this purpose, FBH is developing high reliable, high spectral radiance laser sources emitting at 1064 nm for second harmonic generation, thus halving the wavelength.
Precision agriculture is becoming increasingly important. The FBH evaluates the potential of Raman spectroscopy. The non-destructive optical method can be used to characterize soil, thus paving the way for efficient nutrient management.
High-power, highly efficient broad area diode lasers that are wavelength-stabilized by integrated Bragg gratings are in high demand for example for pumping narrow absorption bands in solid-state lasers. FBH has been conducting intensive research leading to continuous improvements of the institute’s DFB-BA lasers.
To make older systems ready for digitization, FBH has been developing iSensU to provide ad-hoc connectivity to legacy devices, black-box sensors, and industrial light towers. iSensU will shortly be made available to FBH's partner institutes within Research Fab Microelectronics Germany.
InP HBT technology is an ideal candidate for microwave applications in the terahertz range. The FBH uses a transfer substrate process to successfully suppress significant parasitic effects. For further improvements, an in-house diamond wafer bonding process was developed to enhance the thermal management of the wafer.
The next-generation wireless communication infrastructure demands for high flexibility, low cost and high efficiency. The FBH has developed a digital outphasing power amplifier module, an important step towards the all-digital transmitter chain.
FBH demonstrates new performance records of diode laser bars at the operation point of 1 kW. One design approach increased the conversion efficiency up to 66%, while an alternative approach reduced the lateral divergence down to 8.8°, both best-in-class results.
The FBH presents a new, compact and monolithically integrated tunable dual-wavelength laser design based on gallium arsenide. The device parameters were optimized by means of sophisticated simulation tools.