Product & Research in Focus

Research in Focus

Next generation LiDAR laser source for line scanners

FBH’s high pulse power laser source with a 48-emitter diode laser bar is ideally suited for 3D object detection, e.g., for line scanners in automotive LiDAR. Scanning LiDARs emit rapid laser pulses which are reflected by objects. The return time of each pulse is measured by a detector, thereby creating a point cloud of the measured surface. Unlike point scanners, which capture objects point by point via 2D steering mirrors, line scanners use a laser array. Its light is focused to a line which scans a large area using 1D beam steering. The reflected light is collected via a detector row. The wavelength-stabilized FBH laser source delivers 4-10 ns long optical pulses with >600 W pulse peak power at 905 nm wavelength. The wavelength shifts with temperature by 0.06 nm/K only. The DBR-stabilized laser emission has a width of 0.5 nm and >30 dB side mode suppression. The bar is electrically driven by a new in-house developed high-speed GaN driver providing current pulses of up to 800 A with 100 kHz repetition frequency and higher. The optics were designed and realized by FISBA.

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Product in Focus

Highly sensitive THz detectors for room temperature operation

The FBH has developed highly sensitive, fast-response and broadband terahertz (THz) power detectors for CW and pulsed operation, which are based on the in-house GaN HEMT MMIC process. This gives the unique opportunity to tailor both transistors and antenna structures for use up to several THz (patent-protected design). The inherent high breakdown voltage and high current capabilities of the FBH process yields robust detectors, which can be used for industrial quality control as well as for biomedical, spectroscopy and security applications. At room temperature a sensitivity of NEP < 50 pW/Hz1/2 is achieved for circular polarized radiation from 90 GHz up to 1.2 THz. The preamplifier provides an RMS = 8 mV noise floor with 100 kHz bandwidth. Moreover, it offers the possibility to chop a THz CW signal. Thus, it allows using a lock-in amplifier to measure even weak CW THz signals. The system can also be equipped with linearly polarized antenna structures.

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