A switchable and tunable dual-wavelength single-longitudinal-mode (SLM) fiber laser in a 2-μm region based on saturable absorber and self-injection locking is proposed and experimentally demonstrated.

The LLSAW in lithium niobate on stress-free surface reveals rather high attenuation of the order of one dB per wavelength. Calculated resonant characteristics of a long IDT and dispersion curves of ...