Mofa

The project MOFA "mode stable high power fiber laser" is supposed to enduringly strengthen and concentrate the existing research excellence on optical high performance fiber laser systems in Thuringia. The open technological and academic questions of next generation lasers are investigated.

Nowadays the development of powerful and brilliant fiber laser systems is struggling due to the appearance of instabilities and degradation effects at increasing average power levels. At high power powers an anomalous, partly chaotic modal behaviour is observed, which spoils the beam quality and stability in a threshold-like manner.
Hence, the further evolution of high power continuous-wave and pulsed fiber lasers relies on a profound understanding of the basic mechanisms and consequences of the so-called transversal spatial hole burning (TSHB). TSHB is caused by selective depletion of inversion by fundamental mode laser radiation in a rare-earth-doped fiber, hence, leading to an excessive gain of higher order transverse modes.
The goal of the project is the development of novel fiber structures possessing adapted index and doping profiles to mitigate the effect of TSHB and allowing for stable fundamental mode emission of high power fiber laser systems.

 

funded by the Thuringian Ministry of Education, Sciences and Culture within the research programm "ProExzellenz"

 

 

 

funded by