Qiubai Yang

Shanghai Institute of Optics and Fine Mechanics, CAS · High Power Laser Components R&D Center

This study proposes a strategy for enhancing the radiation resistance of glass/fibers by introducing phase interfaces. Through phase-separation techniques and high-temperature annealing treatments, we constructed nanoscale phase interfaces engineered in erbium-ytterbium co-doped high-phosphorus silica glass with a specific density, stability level,...

A numerical model is established to predict the beam quality factor M² of fiber laser for the first time. The finite-difference beam propagation method (FD-BPM) is introduced to simulate the beam propagation of thulium-doped fiber lasers (TDFLs) with given design parameters. The output beam profile can be calculated for an active fiber with complex...

Monolithic distributed Bragg reflector (DBR) cavity which directly integrates fiber Bragg gratings (FBGs) into the photosensitive RE-doped fibers is a promising configuration in constructing compact and efficient single frequency fiber lasers (SFFLs). Yet, the doping level of rare-earth (RE) ions has generally to be sacrificed in the classical Ge-p...

We demonstrated an efficient way to enhance and flatten the emission cross sections of Er³⁺ ions at the L-band in the silicate fiber amplifier by increasing Mg²⁺ (up to 22.5 mol%) with high field strength. High values of Er³⁺ concentration, lifetime, and L-band emission cross section were achieved in our silicate fibers. Particularly, the flatness...

The influence of Tm-doped pedestal fiber splice on the output performance of a large-mode-area (LMA) Tm-doped fiber laser (TDFL) has been investigated. Arc-fusion induced refractive-index deformation leads to laser leakage from the core to the pedestal, resulting in a periodic decrease in the output power of TDFL. Based on the measured refractive-i...

We demonstrate a high ytterbium concentration Yb/Al/P/Ce co-doped silica fiber by conventional modified chemical vapor deposition (MCVD) technology and solution doping process. The fiber has a Yb concentration of about 2.5 wt%, and the corresponding core absorption coefficient is measured to be ∼1400 dB/m at 976 nm. The gain coefficient was measure...

We present a single-frequency erbium-doped fiber laser operated at 1608.8 nm using a homemade, heavily erbium-doped silica fiber as gain medium. The laser configuration is based on a ring cavity, which is combined with a fiber saturable absorber to achieve single-frequency operation. The measured laser linewidth is less than 447 Hz and the optical...

The spectral bandwidth of Er-doped fibers limits their lasing wavelength at longer wave band. Here, to the best of our knowledge, we report a broad emission band (1420‒1680 nm) of Er³⁺ and demonstrate for the first time an Er-phosphate fiber, which supports laser oscillation at the extended wavelengths of 1627 nm and 1630 nm, with the output powers...

The Brillouin gain spectrum (BGS) provides key information for stimulated Brillouin scattering (SBS), such as the Brillouin frequency shift (BFS), Brillouin spontaneous linewidth, and Brillouin gain coefficient. In this study, we theoretically investigate the field distributions and BGS characterization of Ge-doped, Al-doped, and Al/Ge co-doped fib...

中国科学院上海光机所从纤芯材料出发，采用可实现高Er离子浓度掺杂的磷酸盐玻璃作为光纤基质，通过稀土离子局域环境调控以及光谱整形，在自研掺Er磷酸盐光纤中实现了10 dB以上的L-band扩展单级放大增益。

We report a novel pretreatment method to improve the radiation resistance of Er-doped fiber (EDF). The processing object of this method is EDF preform, and the pretreatment processing involves three steps: deuterium loading, pre-irradiation, and thermal annealing. The effects of pretreatment conditions on the optical loss, gain performance, and rad...

A high phosphorus Er3+/Yb3+ co-doped silica (EYPS) fiber core glass was prepared using the sol-gel method combined with high-temperature sintering. The absorption spectra, emission spectra, and fluorescence decay curves were measured and compared in temperatures ranging from 300 to 480 K. Compared to 915 and 97x nm, the absorption cross-section at...

采用改进的化学气相沉积技术结合液相掺杂工艺制备了低损耗Bi掺杂高磷石英基光纤，P2O5摩尔分数高达 7.2% ，光纤的背景损耗为18 dB/km＠1550 nm。 进一步采用1240 nm 的可调谐拉曼激光器泵浦自制Bi掺杂高磷石英基光纤，在1355~1380 nm波段实现净增益，在1355 nm波长处的最高增益为5.14 dB。 这是国内首次制备出低损耗掺铋高磷石英基光纤，并基于该掺铋光纤实现了近红外波段的净增益放大。

Yb³⁺/P⁵⁺/Al³⁺ co-doped silica fiber core glasses with different P⁵⁺/Al³⁺ molar ratios were prepared by the sol-gel method and modified chemical vapor deposition (MCVD) method. The absorption and fluorescence spectra were measured using a temperature range from 25°C to 200°C. Results show that both the major absorption and emission peaks of the Yb³⁺...

In this work, Er/Al/Ge co-doped silica glasses with different GeO2 content (0–3 mol%), as well as Ge/Al co-doped silica glasses, are prepared by combining the sol–gel and high-temperature sintering methods. Further, the effects of the GeO2 content on the absorptions and emissions properties, and lifetimes of the glasses before and after 1KGy γ-ray...

A method based on sol-gel preparation combined with silica tube inner wall coating and fusion-tapering technique for fabrication of ultrahighly rare-earth-doped fibers without fluorescent quenching is provided. Ultrahighly Yb-doped high SiO2 content glass fiber is developed and is easily spliced to commercial fiber-components. A ~ 1.03 μm laser wit...