Passively Q-switching cylindrical vector beam fiber laser operating in high-order mode

Black phosphorus Q-switched and mode-locked Er:ZBLAN fiber lasers at 3.5 um

With the proposal of dual-wavelength pumping (DWP) scheme, DWP Er:ZBLAN fiber lasers at 3.5 um have become a fascinating area of research. However, limited by the absence of suitable saturable absorber, passively Q-switched and mode-locked fiber lasers have not been realized in this spectral region. Based on the layer-dependent bandgap and excellent photoelectric characteristics of black phosphorus (BP), BP is a promising candidate for saturable absorber near 3.5 um. Here, we fabricated a 3.5-um saturable absorber mirror (SAM) by transferring liquid-phase exfoliated BP flakes onto a gold-coate…

利用圆柱矢量光束控制与硅纳米天线耦合的量子发射体的光发射

Control of light emission of quantum emitters coupled to silicon nanoantenna using cylindrical vector beams

本文研究利用圆柱矢量光束的偏振和形状，结合硅纳米环天线，在空间上同时控制Eu3+离子的电偶极和磁偶极发射，并通过实验与数值模拟验证了激发近场和发射LDOS的协同调控作用。

从锁模光纤激光器产生超快矢量涡旋光束的控制

Controlled generation of ultrafast vector vortex beams from a mode-locked fiber laser

本文报道一种新型锁模光纤激光器，通过控制腔内几何相位实现高阶庞加莱球上任意位置超快矢量涡旋光束的直接生成，具有8.5皮秒脉冲宽度和灵活切换能力。

Black phosphorus as saturable absorber for the Q-switched Er:ZBLAN fiber laser at 2.8 μm

Black phosphorus, a newly emerged two-dimensional material, has attracted wide attention as novel photonic material. Here, multi-layer black phosphorus is successfully fabricated by liquid phase exfoliation method. By employing black phosphorus as saturable absorber, we demonstrate a passively Q-switched Er-doped ZBLAN fiber laser at the wavelength of 2.8 μm. The modulation depth and saturation fluence of the black phosphorus saturable absorber are measured to be 15% and 9 μJ/cm2, respectively. The Q-switched fiber laser delivers a maximum average power of 485 mW with corresponding pulse energ…

Polarization pattern of vector vortex beams generated by $q$-plates with different topological charges

We describe the polarization topology of the vector beams emerging from a patterned birefringent liquid crystal plate with a topological charge $q$ at its center ($q$-plate). The polarization topological structures for different $q$-plates and different input polarization states have been studied experimentally by measuring the Stokes parameters point-by-point in the beam transverse plane. Furthermore, we used a tuned $q=1/2$-plate to generate cylindrical vector beams with radial or azimuthal polarizations, with the possibility of switching dynamically between these two cases by simply changin…

On-chip radially and azimuthally polarized vortex beam generation utilizing shallow-etched gratings

Cylindrical vector vortex (CVV) beams, complex light fields that exhibit a vector nature and carry quantized orbital angular momentum states, have been widely investigated due to their rich applications. Current technologies to generate CVV beams using individual polarization and spatial phase manipulations suffer from bulky size and low configurability. In this work, we propose and experimentally demonstrate an approach to generate CVV beams with an integrated device based on silicon nitride microring resonator and embedded top-gratings. The device is capable of generating broad-band radially…

Real-time programmable mode-locked fiber laser with a human-like algorithm

Nonlinear polarized evolution-based passively mode-locked fiber lasers with ultrafast and high peak power pulses are a powerful tool for engineering applications and research. However, their sensitivity to polarization limits their widespread application. To address this, automatic mode-locking immune to environmental disturbances is attracting more concerns. An experimental demonstration of the first real-time programmable mode-locked fiber laser is presented, which is enabled by our proposed human-like algorithm. It combines human logic with a machine's speed, computing capability, and preci…

全片上可重构结构光生成器

All-On-chip Reconfigurable Structured Light Generator

研究提出了首个全片上可重构结构光生成器，通过SOI芯片与二氧化硅模式复用器精确控制六个线偏振模式的功率和相位，合成标量和矢量角动量光束，具有高切换速度并适用于电信波段。