Current Projects

Development of a CW Doppler lidar for Metek GmbH

Goal of the project is to develop a CW Doppler Lidar with a fine range resolution and simultaneous good velocity resolution. The approach is to use a random phase modulation. This makes it possible to obtain good range resolved measurements through computational analysis of the data to avoid the trade-off between range- and Doppler-resolution of a typical pulsed lidar.

Typical applications are studies of turbulent flow in complex terrain such as hills, buildings, bridges, or wind turbines.

Recently concluded projects

Conceptual design for the instrumentation of a research wind park with wind lidar systems

DLR LogoDevelopment of a conceptual design for the instrumentation of a planned research wind park with multiple wind lidar systems for the German Aerospace Center (DLR). This included the development of measuring strategies and specifications of the instruments.

Implementation of a fibre-based coherent detection in a wind lidar

TROPOS LogoIn the wind lidar WiLi of the Leibnitz Institute for Troposphere Research the existing coherent detection system was replaced with a modern balanced receiver with optical fibres. The design was developed and the implementation in the lidar was done jointly with the staff of the institute that was then trained for the use of the detection system.

Selection of earlier projects under the leadership of Dr Christoph Bollig as employee of academic institutions

In order to get a more detailed impression of past activities, have a look at the list of publications.

Pulsed fibre amplifier with integrated detection for wind lidar

Logo Universität OldenburgA compact, pulsed 1550 nm fibre amplifier with an integrated coherent detection system was developed at the University of Oldenburg. This allowed wind measurements up to 1,5 km with an averaging time of only 0,1 s.

Single-frequency Q-switched Ho:YLF High-Power Laser

CSIR LogoA single-frequency Q-switched 2064 nm Ho:YLF laser system was developed at the National Laser Centre of the CSIR Pretoria (South Africa). It consists of a fibre-laser-pumped ring laser that emits 70 mJ at 50 Hz with a diffraction-limited beam and a Ho:YLF slab amplifier that is pumped by a Tm:YLF slab laser. With its single-frequency pulses of 330 mJ at 50 Hz this system to date holds the world record for single-frequency pulsed 2 µm lasers and has a significantly better performance than a comparable laser with which NASA will be measuring wind from space.

4 µm Hydrogen Bromide Laser

CSIR LogoDevelopment of a pulsed hydrogen bromide (HBr) laser of 4 µm also at the National Laser Centre of the CSIR Pretoria. With 2,5 mJ per pulse this holds a world record.

Q-switched High-Power Nd:YLF Laser

Logo University of StellenboschAt the Laser Research Institute (LRI) of the University of Stellenbosch a diode-pumped TEM00 Nd:YLF laser with 10 mJ pulses at 5 kHz was developed. To date this laser boasts the best performance of all pulsed Nd:YLF lasers in the literature.

Blue Single-Frequency Pulsed Laser for Holography

Logo University of StellenboschAlso at the Laser Research Institute of the University of Stellenbosch a pulsed blue laser with a high repetition rate was developed for a USA holography company. A single-frequency pulsed 1314 nm TEM00 Nd:YLF laser was converted to red (657 nm) and then to blue (438 nm). Due to its single-frequency operation the laser had a high coherence length.

In order to get a more detailed impression of past activities, have a look at the list of publications.