Methods of radiation wavelength selection in CW fibre lasers

Abstract This work analyses methods for generating continuous narrowband (or single-frequency) radiation in fibre lasers. The challenge of obtaining narrowband radiation in lasers of this type is due to their relatively broad spectral gain bandwidth, relatively high gain and significant cavity length. Both conventional methods used in bulk lasers and adapted for fibre lasers, as well as special methods unique to fibre lasers, are considered. The main approaches to selecting narrow emission lines in CW fibre lasers are presented, with emphasis on the most promising methods. The advantages and disadvantages of the methods used are indicated.