Nd-doped single-mode all-fiber mode-locked cascaded Raman laser operating at 0.94 and 0.98 µm

Abstract

Based on the Nd-doped single-mode fiber (SMF) as the gain medium and SMF as the Raman medium, an all-fiber mode-locked cascaded Raman laser simultaneously operating at the 0.94 µm and 0.98 µm waveband was demonstrated for the first time. To suppress the mode competition at 1.06 µm, the bending loss of the SMF was introduced by winding the SMF onto a mandrel with a diameter of 10 mm. At the highest pump power of 391 mW, 1st-order and 2nd-order Stokes waves with almost the same intensities were achieved, and the corresponding central wavelengths were 942.37 nm and 983.03 nm, respectively. The cascaded Raman laser simultaneously operating in the 0.94 µm and 0.98 µm obtained in our experiments has the advantages of simple structure and low cost, which can be used as an ideal light source for two-photon microscopy and as a pump source for Er or Yb-doped lasers.