An Ytterbium-Doped Narrow-Bandwidth Randomly Distributed Feedback Laser Emitting at a Wavelength of 976 nm

Abstract

All-fiber, polarization maintaining, narrow-bandwidth, Yb-doped fiber lasers with randomly distributed feedback operated near 976 nm were realized for the first time. It was shown that the laser operated in a single, longitudinal mode regime during intervals of a few seconds. At other times, the laser generated a few longitudinal modes, but its bandwidth was always below the resolution of the optical spectrum analyzer (0.02 nm). The linewidth of each single longitudinal mode of the laser was estimated to be below 20 kHz. The reasons for this observed laser behavior were discussed and methods for achieving stable, continuous wave operation in the single-longitudinal-mode regime were proposed.

Special Issue on Fiber Laser and Their Applications

“…Firstly, lasers at different emission wavelengths have been achieved. Danila et al demonstrated a 976 nm Ytterbium-doped narrowbandwidth randomly distributed feedback laser [1]. Lasers that are operated at 1.5 µm wavelength have been obtained via different methods, such as random laser cavity [2], distributed Bragg reflector laser cavity [3], passive mode locking based on a saturable absorber [4], Brillouin random lasing oscillation, and four-wave mixing [5].…”