Dual-wavelength square pulses fiber laser based on nonlinear effect

Abstract

In this paper, a dual-wavelength square pulses fiber laser with tunable pulse width based on nonlinear polarization rotation and nonlinear effect was studied. The fiber laser containing a 1050-m highly nonlinear fiber operated at central wavelengths of 1533 nm and 1569 nm and the repetition rate was 194.7 kHz. While the polarization state of the laser was unchanged, the pump power was increased from 100 mW to 300 mW, and the pulse width was extended from 163.6 ns to 558.2 ns. In this process, the maximum energy of a single pulse was 8.57 nJ. The simple, compact square pulse dual wavelength fiber laser with tunable pulse width can meet great potential for applications.