Baolai Yang
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View article: 6 kW near single-mode monolithic fiber laser oscillator based on a core NA design of confined ytterbium-doped fiber
6 kW near single-mode monolithic fiber laser oscillator based on a core NA design of confined ytterbium-doped fiber Open
In this article, we presented an investigation on the combination of the low-NA and confined doped design in Yb-doped fiber for gain filtering in the fiber laser oscillator. Theoretical simulations showed that for a ytterbium-doped fiber w…
View article: Simultaneous enhancement of TMI and SRS suppression enabled by tuning the refractive index profile of a low-NA YDF for high power single-mode fiber laser
Simultaneous enhancement of TMI and SRS suppression enabled by tuning the refractive index profile of a low-NA YDF for high power single-mode fiber laser Open
To mitigate the limitations of stimulated Raman scattering (SRS) associated with low dopant concentrations in low numerical-aperture (NA) fibers, this study proposes a central refractive index (RI) dip design for low-NA fibers to further i…
View article: Composite fiber Bragg grating written by femtosecond laser for Raman suppression in high-power fiber oscillators
Composite fiber Bragg grating written by femtosecond laser for Raman suppression in high-power fiber oscillators Open
High-power fiber oscillators have been widely used in industrial processing, high-end manufacturing, biomedicine and so on. However, as the output power increase, stimulated Raman scattering (SRS) becomes the main factor limiting the perfo…
View article: Near-hundred-watt all-fiber multicore fiber laser oscillators fabricated by femtosecond direct writing Bragg gratings in a seven-core Yb-doped fiber
Near-hundred-watt all-fiber multicore fiber laser oscillators fabricated by femtosecond direct writing Bragg gratings in a seven-core Yb-doped fiber Open
We demonstrate the first, to the best of our knowledge, near-hundred-watt, all-fiber, multicore fiber (MCF) laser oscillator, fabricated by femtosecond laser direct writing fiber Bragg gratings (FBGs) in a seven-core Yb-doped fiber. Unlike…
View article: All-fiber highly efficient delivery of 2 kW laser over 2.45 km hollow-core fiber
All-fiber highly efficient delivery of 2 kW laser over 2.45 km hollow-core fiber Open
Anti-resonant hollow-core fibers have emerged as an important medium for high-power laser delivery due to their low optical nonlinearity and high damage threshold. However, current delivery systems of high-power laser based on anti-resonan…
View article: 6.7 kW LD-Pumped Nearly-Single-Mode MOPA Fiber Laser Enabled by Low-NA Confined-Doped Fiber
6.7 kW LD-Pumped Nearly-Single-Mode MOPA Fiber Laser Enabled by Low-NA Confined-Doped Fiber Open
Optimized designs of the ytterbium-doped fiber (YDF) have been effective at mitigating transverse mode instability (TMI) and enabling high-power scaling. In this study, the use of low-NA confined-doped YDFs is explored to achieve high-powe…
View article: 4.2 kW, 0.11 nm, near single-mode isolator-free narrow-linewidth fiber laser of a one-stage amplifier seeded by a taped fiber oscillator
4.2 kW, 0.11 nm, near single-mode isolator-free narrow-linewidth fiber laser of a one-stage amplifier seeded by a taped fiber oscillator Open
High-power narrow-linewidth fiber amplifiers (NLFAs) have wide applications in beam combining, lidar system, nonlinear frequency conversion, etc. It’s a challenging task to simultaneously control beam quality and linewidth of high-power NL…
View article: 5.2 kW bidirectional-pumping fiber oscillator based on confined doped fiber
5.2 kW bidirectional-pumping fiber oscillator based on confined doped fiber Open
In this manuscript, we theoretically analyze the impact of bend-induced mode distortion and Yb-doping ratio on the gain distribution for modes and transverse mode instability (TMI), which indicates the advantages of using confined-doped fi…
View article: Mode control in a 7.2 kW near-single-mode monolithic fiber amplifier employing the gain-tailoring effect
Mode control in a 7.2 kW near-single-mode monolithic fiber amplifier employing the gain-tailoring effect Open
In this paper, we investigate the performance of a high-power confined doped fiber amplifier to achieve high power and high beam quality. The impact of various factors, including core diameter, doping ratio, and numerical aperture, on the …
View article: All-fiber highly efficient delivery of 2 kW laser over 2.45 km hollow-core fiber
All-fiber highly efficient delivery of 2 kW laser over 2.45 km hollow-core fiber Open
Anti-resonant hollow-core fibers (AR-HCFs) have emerged as an important medium for high-power laser delivery due to their low optical nonlinearity and high damage threshold. However, current delivery systems of high-power laser based on AR…
View article: High-brightness multimode fiber laser amplifier
High-brightness multimode fiber laser amplifier Open
Fiber lasers are widely used in various fields owing to their high efficiency, flexible transmission and excellent beam quality. In applications such as industrial manufacturing and defense systems, a higher output power is always desired.…
View article: 20 kW Monolithic Fiber Amplifier With Directly Dual-Wavelength Laser Diodes Counter Pumping
20 kW Monolithic Fiber Amplifier With Directly Dual-Wavelength Laser Diodes Counter Pumping Open
In this study, we demonstrate a high-power ytterbium-doped fiber laser (YDFL) based on laser diodes (LDs) directly pumping scheme. Tandem pumping and LD direct pumping are two common schemes for generating high-brightness laser output in Y…
View article: Power optimization of high-power random Raman laser with a full-open cavity
Power optimization of high-power random Raman laser with a full-open cavity Open
Since the concept of distributed feedback fiber random laser was put forward, random Raman fiber laser (RRFL) has made great progress in high power operation. For RRFL with a full-open cavity, the simplest cavity structure, further power s…
View article: A 3.2 kW Single Stage Narrow Linewidth Fiber Amplifier Emitting at 1050 nm
A 3.2 kW Single Stage Narrow Linewidth Fiber Amplifier Emitting at 1050 nm Open
In this paper, we have demonstrated a narrow linewidth high power fiber laser emitting at a short wavelength of ~1050 nm. The fiber laser is based on a structure of master oscillator power amplification (MOPA) with an optimized fiber Bragg…
View article: Single Trench Fiber-Enabled High-Power Fiber Laser
Single Trench Fiber-Enabled High-Power Fiber Laser Open
As a novel design of large-mode-area fiber, the single trench fiber (STF) providing high higher-order-mode suppression with a large mode area for the fundamental mode shows potential for high-power and high-brightness applications. However…
View article: Temperature Dependence of Spectral Properties of Yb-Doped Superfluorescent Fiber Source
Temperature Dependence of Spectral Properties of Yb-Doped Superfluorescent Fiber Source Open
Fiber laser has been developed to the point where the average power scaling can reach several kilowatts readily for oscillators and more for amplifiers. In the meanwhile, the thermal effects inside the fiber laser also become prominent. Te…
View article: 10 kW tandem pumping fiber amplifier with good beam quality based on tapered ytterbium-doped fiber
10 kW tandem pumping fiber amplifier with good beam quality based on tapered ytterbium-doped fiber Open
In this paper, we established a high power tandem pumped fiber amplifier based on tapered ytterbium-doped fiber (TYDF). The TYDF is developed in-house with a core/inner cladding diameter of 30/250 µm at the small-core region and 48/400 µm …
View article: A 5 kW Nearly-Single-Mode Monolithic Fiber Laser Emitting at ~1050 nm Employing Asymmetric Bi-Tapered Ytterbium-Doped Fiber
A 5 kW Nearly-Single-Mode Monolithic Fiber Laser Emitting at ~1050 nm Employing Asymmetric Bi-Tapered Ytterbium-Doped Fiber Open
Limited by stimulated Raman scattering (SRS), amplified spontaneous emission (ASE) and transverse mode instability (TMI), it is challenging to achieve high-power laser output in ytterbium-doped fiber (YDF) lasers with operating wavelengths…
View article: A 4.8-kW high-efficiency 1050-nm monolithic fiber laser amplifier employing a pump-sharing structure
A 4.8-kW high-efficiency 1050-nm monolithic fiber laser amplifier employing a pump-sharing structure Open
The power scaling of ytterbium-doped fiber (YDF) lasers emitting at the wavelength range of 1030 nm–1060 nm has been limited by amplified spontaneous emission (ASE), stimulated Raman scattering (SRS) effect, and transverse mode instability…
View article: 6 kW Single Stage Narrow Linewidth Fiber Amplifier Based on the Balance Between Mode Instability and Nonlinear Effects
6 kW Single Stage Narrow Linewidth Fiber Amplifier Based on the Balance Between Mode Instability and Nonlinear Effects Open
Single-stage high-power narrow-linewidth fiber laser has been investigated intensively recently because of its simple and robust configuration and great potential in spectral/coherent beam combination. In this work, a 6 kW narrow-linewidth…
View article: Research of Transverse Mode Instability in High-Power Bidirectional Output Yb-Doped Fiber Laser Oscillators
Research of Transverse Mode Instability in High-Power Bidirectional Output Yb-Doped Fiber Laser Oscillators Open
Bidirectional output fiber laser oscillators can realize two high-power laser outputs employing only a single-laser resonant cavity and hold the advantages of being low cost and of compact size. However, like other fiber lasers, their powe…
View article: Towards a tapered Yb-doped fiber-based narrow linewidth single-mode fiber laser with a high signal to Raman ratio
Towards a tapered Yb-doped fiber-based narrow linewidth single-mode fiber laser with a high signal to Raman ratio Open
We demonstrate an all-fiber high-power narrow-linewidth fiber laser based on a homemade tapered Yb-doped fiber (T-YDF). The laser performance is investigated and systematically compared with different seed powers and pump manners. The expe…
View article: Origin of SRS-induced beam quality distortion under TMI threshold
Origin of SRS-induced beam quality distortion under TMI threshold Open
In high power fiber lasers, the degradation of beam quality caused by Raman effect has attracted more and more attention in recent years, but its physical mechanism is still unclear. We're going to differentiate between heat effect and non…
View article: Demonstration of 3 kW-Level Nearly Single Mode Monolithic Fiber Amplifier Emitting at 1050 Nm Employing Tapered Yb-Doped Fiber
Demonstration of 3 kW-Level Nearly Single Mode Monolithic Fiber Amplifier Emitting at 1050 Nm Employing Tapered Yb-Doped Fiber Open
Tapered Yb-doped fiber (T-YDF) can balance the suppression of transverse mode instability (TMI) and stimulated Raman scattering (SRS) in high power fiber lasers. In this work, we have constructed an all-fiberized master oscillator power am…
View article: Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects
Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects Open
Up to now, transverse mode instability (TMI) and stimulated Raman scattering (SRS) have become the main factors limiting the power scaling of conventional ytterbium-doped fiber laser. Many technologies are proposed to suppress the SRS or T…
View article: Femtosecond laser fabrication of large-core fiber Bragg gratings for high-power fiber oscillators
Femtosecond laser fabrication of large-core fiber Bragg gratings for high-power fiber oscillators Open
In this paper, a fs-laser phase mask inscription system based on a galvanometer scanning strategy is designed and set up for the fabrication of large-core fiber Bragg gratings (FBGs). Based on this setup, a homogeneous cross-sectional refr…
View article: High Power Ytterbium-Doped Fiber Lasers Employing Longitudinal Vary Core Diameter Active Fibers
High Power Ytterbium-Doped Fiber Lasers Employing Longitudinal Vary Core Diameter Active Fibers Open
Thanks to the advantage of balancing nonlinear effects and transverse mode instability, vary core diameter active fiber (VCAF) has been widely used in high power ytterbium-doped fiber lasers in recent years. Up to now, VCAF has developed f…