Dissipative soliton generation in Yb-fiber laser with an invisible intracavity bandpass filter

Abstract

We report on dissipative soliton (DS) generation in an Yb-doped (YDF) fiber laser passively mode locked with the nonlinear polarization rotation (NPR) technique. We found that even without the insertion of a physical bandpass filter in the cavity, not only could DSs be automatically formed in the laser but also the formed DSs have a spectral bandwidth that is far narrower than the Yb-fiber gain bandwidth. Numerical simulations well reproduced the experimental observations. Our results suggest that a physical intracavity bandpass filter is not a crucial component for the generation of DSs in all-normal-dispersion YDF lasers mode locked with the NPR technique.

Passive mode locking of ytterbium- and erbium-doped all-fiber lasers using graphene oxide saturable absorbers

“…In our YDFL, the DSs can be automatically formed without adding extra filter. The spectral filtering may be provided from intracavity birefringent filter of the laser (an intracavity component with polarization dependent loss and birefringence of intracavity fiber as a Lyot filter) [56], the gain fiber (cutting the pulse temporal wings introduced by normal GVD during intracavity propagation) [57,58], or the fiber nonlinearity and the chirping induced in the normal-dispersion cavity in conjunction with the nonlinear transmission of GO-SAs [59]. However, the bandwidth of spectral filtering is too wide to effectively shape the pulses.…”

Generation of Soliton Molecules in a Normal-Dispersion Fiber Laser

“…There are two filters in our laser. One is consisted of PDI and birefringence of the fiber wrapped on the two PCs in the cavity [7], [23], and the other is formed by the limited gain bandwidth of EDF. The output port is connected to an autocorrelator, an optical spectrum analyzer and a fast photodetector to monitor the output pulses.…”

978 nm 1.24 ps ultra-short plused large mode area photonic crystal fiber laser

“…The NPE plays not only a mode-locking role, but also a narrowband filter. Because the artificial filter effect always exists in NPE mode-locked fiber laser [18]. In fact, the effect of narrowband filter also comes from some other elements (such as SESAM and half wave plate) in the cavity.…”

“…On the one hand, LMA-PCF is used in laser cavity which has a small dispersion and low nonlinear effect [22]. On the other hand, the NPE elements in the cavity have a function of narrowband filter and the effect of NPE could naturally introduce an invisible intracavity bandpass filter [18], and it consequently narrows the effective gain bandwidth of the laser. While in the actual experiments, filter band is not only related to the introduced virtual narrow-band filter in theory, also related to the polarization effect introduced by adjusting the wave plate in the process of adjustment to satisfy the mode-locking condition.…”