Simultaneous emission of Gaussian-like and parabolic-like pulse waveforms in an erbium-doped dual-wavelength fiber laser

Abstract

We report on the observation of different pulse formation dynamics in a nonlinear polarization evolution (NPE)-based broadband erbium-doped fiber laser when the net cavity group-velocity dispersion (GVD) is managed to be close to zero. The fiber laser can generate pulses with a single wavelength or dual wavelengths by adjusting the waveplates. When the laser operates in dual-wavelength emission, the output pulses corresponding to the two wavelengths exhibit Gaussian- and parabolic-like waveforms, respectively, indicating that the laser can simultaneously operate in stretched-pulse and self-similar regimes. The generation of dual-wavelength emission with different pulse waveforms can be attributed to an overdriven NPE switch acting on a chirped broadband pulse and different dispersion mechanisms. These findings provide a good foundation for comprehensively studying pulse formation dynamics in laser cavities.

SnSe2 Nanosheets for Subpicosecond Harmonic Mode‐Locked Pulse Generation

“…2D materials are well known for their excellent nonlinear optical properties and have great value of nonlinear optical application in near‐infrared (NIR) and mid‐IR regions . At present, 2D materials such as graphene, topological insulator, transition metal sulfide, and black phosphorus have been widely reported in nonlinear optical applications . However, the research on the nonlinear optical properties of new 2D is still in its infancy.…”

1/1.5 μm Synchronized Dual-Band Mode-Locked Fiber Laser

“…In recent years, there is a growing interest in the so-called dual-band mode-locked fiber lasers in which the optical pulses are generated in two distinct spectral bands simultaneously. Unlike conventional dual-wavelength lasers [2]- [5] which operate at two adjacent wavelengths (i.e., the two lasing wavelengths are within the identical spectral band), dual-band lasers generate radiations at two wavelengths locating far apart (e.g., 1/1.5 μm, 1.5/2 μm, etc.). Such lasers exhibit unique advantages in the applications where radiations from different spectral bands are required simultaneously.…”

Emerging 2D Semiconducting Materials: Tin Diselenide for Ultrafast Photonics

“…Pulsed laser light sources are widely used in biological detection, optical communication, surgery, terahertz wave generation, and precision micromachanics of materials and so on. [ 1–9 ] Because of its simple and compact structure, low cost, excellent heat dissipation, high stability, and easy miniaturization, fiber laser has become an ideal choice for pulsed laser source. [ 10–15 ] At the same time, the dispersion and large nonlinearity of fiber enable the pulsed fiber laser to generate pulses of various properties, which can meet the application needs of different fields.…”