A diverse set of soliton molecules generation in a passively mode-locked Er-doped fiber laser with a saturable absorber of WSe2 nanofilm

Abstract

WSe2, an intriguing transition metal dichalcogenides (TMDs) material with high-performance electronic and optoelectronics property, is emerging as next-generation photoelectronic devices. In this contribution, by applying WSe2 nanofilm as a saturable absorber in an Er-doped fiber laser, versatile mode-locked operations of conventional soliton, soliton molecules and dual-wavelength mode locked state can be experimentally observed. By properly setting the state of the polarization controller and pump power, the phase difference and pulse separation of soliton molecules can be adjusted. The soliton molecule with four steady phase difference (0, ±π/2, π) are realized in the fiber laser with TMDs based SA for the first time, to our knowledge. Meanwhile, a novel dual-wavelength mode-locked state with a soliton singlet and a soliton molecule is also obtained. Experiments results show that WSe2 is a suitable SA for vector soliton and soliton molecules generation.

Keywords

• Tungsten diselenide
• Saturable absorber
• Soliton molecules
• Laser mode-locking