Implementation or Suppression of the Collective Lasing of the Laser Channels at the Intracavity Spectral Beam Combining

Abstract

The spectral and spatial output parameters of a two-channel, Yb-doped fiber laser operating in the intracavity spectral beam combining mode were investigated. We showed that by using active media with slightly different gain spectra, it is possible to implement either the spectral combining mode of the independent laser channels or the mode of collective lasing of the channels. The difference in the gain spectra of the active media was realized due to the difference in the threshold inverse population in the Yb-doped fibers.

Keywords

• multi-channel laser
• spectral beam combining
• collective lasing
• fiber lasers