Liangjin Huang
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View article: High-Power Near-Single-Mode Fiber Laser Based on the Low-NA Confined-Doped Fiber: Numerical Investigation and 6.74 kW Experimental Validation
High-Power Near-Single-Mode Fiber Laser Based on the Low-NA Confined-Doped Fiber: Numerical Investigation and 6.74 kW Experimental Validation Open
View article: 自研低NA部分掺杂光纤实现6.7 kW近单模激光输出
自研低NA部分掺杂光纤实现6.7 kW近单模激光输出 Open
View article: High-fidelity delivery of kilowatt-level single-mode lasers through a tapered multimode fiber over one hundred meters
High-fidelity delivery of kilowatt-level single-mode lasers through a tapered multimode fiber over one hundred meters Open
The immediate priorities for high-power delivery employing solid-core fibers are balancing the nonlinear effect and beam deterioration. Here, the scheme of tapered multimode fiber is experimentally realized. The tapered multimode fiber, fe…
View article: Numerical Investigation of Raman-Assisted Four-Wave Mixing in Tapered Fiber Raman Fiber Amplifier
Numerical Investigation of Raman-Assisted Four-Wave Mixing in Tapered Fiber Raman Fiber Amplifier Open
The generation of unwanted higher-order Raman effects is the main factor restricting the power scaling of Raman fiber amplifiers (RFAs). This phenomenon arises from an interplay of physical processes, including stimulated Raman scattering …
View article: Theoretical Study on Transverse Mode Instability in Raman Fiber Amplifiers Considering Mode Excitation
Theoretical Study on Transverse Mode Instability in Raman Fiber Amplifiers Considering Mode Excitation Open
Raman fiber lasers (RFLs), which are based on the stimulated Raman scattering effect, generate laser beams and offer distinct advantages such as flexibility in wavelength, low quantum defects, and absence from photo-darkening. However, as …
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: Simplified expression for transverse mode instability threshold in high power fiber lasers
Simplified expression for transverse mode instability threshold in high power fiber lasers Open
In this work, we propose an analytical expression for calculating the transverse mode instability (TMI) threshold power, which clearly shows the role of various fiber parameters and system parameters. The TMI threshold expression is obtain…
View article: Investigation on laser absorption and x-ray radiation in microstructured titanium targets heated by short-pulse relativistic laser pulses
Investigation on laser absorption and x-ray radiation in microstructured titanium targets heated by short-pulse relativistic laser pulses Open
The enhancement effect of a microstructured surface on laser absorption and characteristic Kα emission has been investigated by measuring K-shell emission from titanium (Ti) targets irradiated with high-intensity (~1020 W cm
View article: 千瓦级单模激光传输超越百米
千瓦级单模激光传输超越百米 Open
View article: Tracing the origins of mode coupling for beam quality optimization in high-power fiber laser delivery systems
Tracing the origins of mode coupling for beam quality optimization in high-power fiber laser delivery systems Open
Suppressing mode degradation is the key issue for high-power laser delivery; however, diagnosing mode degradation in its entirety, ranging from the contents and origins to locations, has always been a major obstacle. Here, a versatile appr…
View article: 5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber
5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber Open
A low-numerical-aperture (NA) concept enables large-mode-area fiber with better single-mode operation ability, which is beneficial for transverse mode instability and nonlinear effects suppression. In this contribution, we reported a high-…
View article: Design and optimization methods towards a 10 kW high beam quality fiber laser based on the counter tandem pumping scheme
Design and optimization methods towards a 10 kW high beam quality fiber laser based on the counter tandem pumping scheme Open
In this study, we investigated the influence of fiber parameters on stimulated Raman scattering (SRS) and identified a unique pattern of SRS evolution in the counter tandem pumping configuration. Our findings revealed that the SRS threshol…
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: Broadband tunable Raman fiber laser with monochromatic pump
Broadband tunable Raman fiber laser with monochromatic pump Open
Raman fiber laser (RFL) has been widely adopted in astronomy, optical sensing, imaging, and communication due to its unique advantages of flexible wavelength and broadband gain spectrum. Conventional RFLs are generally based on silica fibe…
View article: Reducing the refractive index by replacing an [AlPO<sub>4</sub>]° unit with [BPO<sub>4</sub>]° in fused silica: reply
Reducing the refractive index by replacing an [AlPO<sub>4</sub>]° unit with [BPO<sub>4</sub>]° in fused silica: reply Open
We are grateful to Ballato et al. [ Opt. Mater. Express 13 , 2338 ( 2023 ) 10.1364/OME.491887 ] for their comment on our recently published paper. The optical model and simulation of optical fiber materials are important to design new mate…
View article: Mitigation of TMI in an 8 kW tandem pumped fiber amplifier enabled by inter-mode gain competition mechanism through bending control
Mitigation of TMI in an 8 kW tandem pumped fiber amplifier enabled by inter-mode gain competition mechanism through bending control Open
In this work, the impact of fiber bending and mode content on transverse mode instability (TMI) is investigated. Based on a modified stimulated thermal Rayleigh scattering (STRS) model considering the gain competition between transverse mo…
View article: Deep learning–based vortex decomposition and switching based on fiber vector eigenmodes
Deep learning–based vortex decomposition and switching based on fiber vector eigenmodes Open
Structured optical fields, such as cylindrical vector (CV) and orbital angular momentum (OAM) modes, have attracted considerable attention due to their polarization singularities and helical phase wavefront structure. However, one of the m…
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: Impact of the central refractive index dip of fibers on high-power applications
Impact of the central refractive index dip of fibers on high-power applications Open
Central refractive index dip is a common phenomenon in the fibers fabricated by the modified chemical vapor deposition (MCVD) technology, which is the main fabrication technique for high-power laser fibers. In this paper, we present a nume…
View article: Reducing the refractive index by replacing an [AlPO<sub>4</sub>]° unit with [BPO<sub>4</sub>]° in fused silica
Reducing the refractive index by replacing an [AlPO<sub>4</sub>]° unit with [BPO<sub>4</sub>]° in fused silica Open
The radiation resistance of rare-earth doped optical fibers is critical to applications in space-based environments such as laser radars, optical communications, and laser altimeters. Usually, doping various elements, such as aluminum (Al)…
View article: 基于FBG窄谱光纤激光放大器实现新突破
基于FBG窄谱光纤激光放大器实现新突破 Open
View article: 高功率高光束质量级联泵浦掺镱光纤激光器研究进展
高功率高光束质量级联泵浦掺镱光纤激光器研究进展 Open
级联泵浦方案具有泵浦光亮度高、量子亏损小、光纤热负荷低、模式不稳定阈值高等优势，是获得高功率光纤激光的主要技术方案。目前，万瓦级高光束质量光纤激光的实现在非线性效应抑制和模式控制等方面遇到困难。本文介绍了国防科技大学近年来在高光束质量级联泵浦光纤激光器方面的研究进展，并对功率和光束质量进一步提升的可行途径进行了分析。
View article: Comprehensive Investigation on the Gain Filtering Effect in the High-Power Fiber Oscillator Using Confined-Doped Fiber
Comprehensive Investigation on the Gain Filtering Effect in the High-Power Fiber Oscillator Using Confined-Doped Fiber Open
View article: Functional Fibers and Functional Fiber-Based Components for High-Power Lasers
Functional Fibers and Functional Fiber-Based Components for High-Power Lasers Open
The success of high-power fiber lasers is fueled by maturation of active and passive fibers, combined with the availability of high-power fiber-based components. In this contribution, we first overview the enormous potential of rare-earth …
View article: Threshold of transverse mode instability considering four-wave mixing
Threshold of transverse mode instability considering four-wave mixing Open
In this work, the influence of four-wave mixing (FWM) effects on the transverse mode instability (TMI) is incorporated into the TMI model based on stimulated thermal Rayleigh scattering. The model is capable of analyzing the gain character…
View article: Influence of Gain Saturation Effect on Transverse Mode Instability Considering Four-Wave Mixing
Influence of Gain Saturation Effect on Transverse Mode Instability Considering Four-Wave Mixing Open
Transverse mode instability (TMI) has been recognized as onse of the primary limiting factors for the average power scaling of high-brightness fiber lasers. In this work, a static model of the TMI effect based on stimulated thermal Rayleig…
View article: Fiber laser development enabled by machine learning: review and prospect
Fiber laser development enabled by machine learning: review and prospect Open
View article: M<sup>2</sup> factor estimation in few-mode fibers based on a shallow neural network
M<sup>2</sup> factor estimation in few-mode fibers based on a shallow neural network Open
A high-accuracy, high-speed, and low-cost M 2 factor estimation method for few-mode fibers based on a shallow neural network is presented in this work. Benefiting from the dimensionality reduction technique, which transforms the two-dimens…
View article: Bidirectional tandem-pumped high-brightness 6 kW level narrow-linewidth confined-doped fiber amplifier exploiting the side-coupled technique
Bidirectional tandem-pumped high-brightness 6 kW level narrow-linewidth confined-doped fiber amplifier exploiting the side-coupled technique Open
In this work, a bidirectional tandem-pumped high-power narrow-linewidth confined-doped ytterbium fiber amplifier is demonstrated based on side-coupled combiners. Benefiting from the large-mode-area design of the confined-doped fiber, the n…
View article: Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control
Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control Open
In this work, a confined-doped fiber with the core/inner-cladding diameter of 40/250 μm and a relative doping ratio of 0.75 is fabricated through a modified chemical vapor deposition method combined with the chelate gas deposition techniqu…