Synchronized triple-wavelength fiber lasers at 1, 1.55, and 1.9 m

Synchronized lasers working at different wavelengths are of great significance for numerous applications, such as high-energy femtosecond pulse emission, Raman microscopy, and precise timing distribution. Here, we report synchro-nized triple-wavelength fiber lasers working at 1, 1.55, and 1.9 mu m, respectively, by combining the coupling and injec-tion configurations. The laser system consists of three fiber resonators gained by ytterbium-doped fiber, erbium-doped fiber, and thulium-doped fiber, respectively. Ultrafast opti-cal pulses formed in these resonators are obtained by passive mode-locking with the use of a carbon-nanotube saturable absorber. A maximum cavity mismatch of similar to 1.4 mm is reached by the synchronized triple-wavelength fiber lasers in the synchronization regime by finely tuning the variable optical delay lines incorporated in the fiber cavities. In addi-tion, we investigate the synchronization characteristics of a non-polarization-maintaining fiber laser in an injection configuration. Our results provide a new, to the best of our knowledge, perspective on multi-color synchronized ultra -fast lasers with broad spectral coverage, high compactness, and a tunable repetition rate. (c) 2023 Optica Publishing Group