A 1.9 μm noise-like mode-locked fiber laser based on compact figure-9 resonator

We report a Tm/Ho co-doped noise-like mode-locked pulse fiber laser with a compact figure-9 resonator. In this laser, mode-locking can be realized through the nonlinear amplifying loop mirror technique. The noise-like mode-locked pulse with spectra bandwidth of 10.22 nm and pulse energy of 97.4 nJ is generated at a center wavelength of 1907.56 nm. The Tm/Ho fiber laser with a high energy noise-like mode-locked pulse in a wide range and such a simple structure provides a good candidate of pulse source for generating supercontinuum at wavelength range of 1.9 mu m.