Single Frequency DFB Fiber Lasers for Spectroscopy and Sensing
Jens Engholm Pedersen, Christian V. Poulsen, Poul Varming
Koheras A/S
Blokken 84
DK3460 Birkerød
DENMARK
+45-43483900
jep@koheras.com
Abstract: Single frequency CW DFB fiber lasers find applications in sensing and
spectroscopy due to their superior noise performance, single mode operation, freedom of
choice of wavelength, stability and ease of maintenance. The typically low power (10’s of mW)
output from DFB fiber lasers can be amplified to several Watts using double clad fiber
technology in combination with high power multi mode pump lasers; with large mode area
fiber the threshold for stimulated Brillouin scattering can be pushed to allow amplification even
further to power levels in excess of 100 W. Such high power single frequency sources are
used in coherent beam combining, remote sensing, laser display systems, and other
applications that require high efficiency frequency doubling of CW laser light. The
presentation will discuss fundamental aspects of DFB fiber lasers as well as applications.