Observation and optimization of 2 μm mode-locked pulses in all-fiber net anomalous dispersion laser cavity

Abstract

We integrally demonstrate 2 μm mode-locked pulses performances in all-fiber net anomalous dispersion cavity. Stable mode-locking operations with the center wavelength around 1950-1980 nm can be achieved by using the nonlinear polarization rotation structure and properly designing the dispersion management component. Conventional soliton is firstly obtained with a total anomalous dispersion cavity. Due to the contribution of commercial ultra-high numerical aperture fibers, net dispersion is reduced to-0.077 ps 2. So that stretched pulse with 19.4 nm optical bandwidth is obtained and the de-chirped pulse-width can reach 312 fs using extra-cavity compression. Under pump power greater than 890 mW, stretched pulse can evolve into noise-like pulse with 41.3 nm bandwidth. The envelope and peak of such broadband pulse can be compressed with up to 2.2 ps and 145 fs, respectively. The single pulse energy of largely chirped stretched and noise-like pulse can reach 1.785 nJ and 1.53 nJ, respectively. Furthermore, extra-cavity compression can also contribute to a significant increase of peak power.

Functional nonlinear optical nanoparticles synthesized by laser ablation

“…For example, optical limiting materials are used to construct the sensors for laser-guided weapons. In the laserguided weapons, the seeker is one component to guide the weapon towards the target, which is critical for the accurate tracking 112 . Anti-jamming is a critical function for these seekers.…”

“…Multiple types of nanoparticles can be mixed together to provide protection across a broad range of wavelengths. With this protective component, the laser seeker can overcome its limitation and become capable to tackle the high power noises in a complicated environment 112 . This application demonstrates that optical limiter is effective to function as filters.…”

2.1 μm Band Dissipative Soliton Resonance Mode-Locked Ho-Doped Tunable Fiber Laser

“…[1]- [5]. However, most of optical fibers have large anomalous dispersion in the 2 µm band [6], [7], hence the solitons can be actually formed in a non-dissipative system [8]. The pump power is too high to hold on one soliton in quantity according to the theory of soliton area.…”

Noise-Like Pulse Generated by All-Fiber Ultrafast Thulium-Doped Fiber Laser Based on Single-Wall Carbon Nanotubes

“…In the all-fiber passive mode-locking structure, the modelocking mechanism can be divided into fiber nonlinear effect and saturable absorber material, both of which have advantages in the generation process of mode-locking pulse [4]- [6]. Using nonlinear effects to achieve ultra-short mode-locked pulse output, mainly through filtering caused by optical polarization interference or fast saturation absorption effects, such as Nonlinear Polarization Rotation (NPR) and Nonlinear Amplifier Loop Mirror (NALM) [7]- [10].…”