PM Tm-doped fiber laser harmonically mode-locked using single-walled carbon nanotubes

A polarization maintaining thulium-doped fiber laser mode-locked by single-walled carbon nanotubes has been developed. The pulse repetition frequency varied with increasing power from 84 to 504 MHz. Following pulse parameters are achieved: the pulse duration of 440 fs, center wavelength of 1912 nm, maximum average power of 600 mW, maximum pulse energy of 1.2 nJ.