Article
Optics
Yang Li, Xiulu Hao, Yi An, Yi Zhu, Tianfu Yao, Xianglong Zeng, Pu Zhou
Summary: In this experiment, an all-fiberized random distributed feedback Raman fiber laser (RRFL) with LP11 mode output at 1134 nm was demonstrated. Modal switching was achieved using an intracavity acoustically induced fiber grating. The maximum output power of LP11 mode was 93.8 W with a modal purity of 82%. This work may enable the development of advanced fiber lasers with special temporal and spatial characteristics for various applications.
CHINESE OPTICS LETTERS
(2023)
Article
Optics
Lei Song, Yuxin Liu, Ran Guo, Jun Dai
Summary: In this study, CsPbBr3 nanoplates with regular square shapes were synthesized using the chemical vapor deposition method, and whispering gallery mode-like lasing was observed at room temperature. The blueshift of lasing modes was found to be caused by the variation of refractive index resulting from the highly injected carrier density.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Xiaolei Hao, Shiyuan Zhao, Jingjing Gao, Liujia Suo
Summary: In this research, a novel all-optical tunable microlaser based on a polymer-coated microcavity embedded with a high-efficiency nanoheater is proposed. The large refractive index contrast between polymer and air allows for whispering gallery mode (WGM) resonances, enabling lasing from polymer microshells via total internal reflection. By using a Nd3+ heavily doped NaGdF4 nanocrystal (NC) as a nanoscale heat source, a maximum photothermal conversion efficiency of 82.9% is achieved under the continuous triggering of a 793 nm laser. The nanoheater, doped into the silica core by infrared laser ablation, enables the coated microcavity to maintain a high Q factor up to 1.6 x 106, and significant heat transfer is achieved through the absorption of the 793 nm trigger light by the nanoheater.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Niels Heermeier, Tobias Heuser, Jan Grosse, Natalie Jung, Arsenty Kaganskiy, Markus Lindemann, Nils C. Gerhardt, Martin R. Hofmann, Stephan Reitzenstein
Summary: Spin-controlled lasers and high-beta quantum dot micropillar lasers are two fascinating photonic devices with potential applications. The experimental and predicted polarization oscillation frequencies of spin-laser effects are presented, demonstrating the possibility of developing more compact, faster, and more energy-efficient spin-lasers.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Dan Su, Tianrui Zhai, Kun Ge, Shuai Zhang, Zhiyang Xu, Junhua Tong, Hongzhao Li, Shiju Sun, Ying Zhang, Xiaolei Wang
Summary: A new drip-coating method was proposed in this study, which can rapidly and cost-effectively prepare irregular cavities with arbitrary boundaries for WGM lasers. The resulting laser can achieve single-mode and multi-mode WGM lasing.
Article
Optics
J. Riepl, J. Raab, P. Abajyan, H. Nong, J. R. Freeman, L. H. Li, E. H. Linfield, A. G. Davies, A. Wacker, T. Albes, C. Jirauschek, C. Lange, S. S. Dhillon, R. Huber
Summary: The study investigates the ultrafast two-dimensional spectroscopy of a free-running THz QCL using high-field THz pulses, revealing strong nonlinear effects and the nonlinear polarization dynamics of QCL laser transitions. The data uncover extremely short gain recovery times and nonlinear effects, showing potential for future applications.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Yuyin Li, Peng Chen, Xianfei Zhang, Ziwen Yan, Tong Xu, Zili Xie, Xiangqian Xiu, Dunjun Chen, Hong Zhao, Yi Shi, Rong Zhang, Youdou Zheng
Summary: Low-threshold lasing under pulsed optical pumping is achieved in GaN-based microrod cavities at room temperature. The microrods are fabricated on patterned sapphire substrates (PSS). Confocal micro-photoluminescence spectroscopy is used to analyze the lasing properties of microrods with different diameters at different locations on the PSS substrates. The results show that the 2 μm-diameter microrod cavity has the lowest threshold.
Article
Optics
Aurelian Loirette-Pelous, Jean-Jacques Greffet
Summary: In this study, a new theoretical framework is built using established theoretical models and experimental results to explore the phenomena of photon Bose-Einstein condensation and photon thermalisation in semiconductors. The figures of merit for thermalisation and different experimental procedures are discussed. Finally, the fluctuations of the system and their relationship to different regimes are explored.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Guan Yu Yu, Zheng Huang, Rui Ma, Zhi Yong Bai, Rui Liu, Dian Yuan Fan, Jun Liu
Summary: In this paper, a fiber-based vortex random fiber laser (RFL) with a maximum output power of 3.77 W is demonstrated using a mode converter based on a long period fiber grating (LPFG) and the structure of random fiber laser (RFL). The vortex RFL shows excellent properties including doughnut-shaped intensity distribution, temporal stability, modeless output, and low relative intensity fluctuation. This work not only provides a potential scheme for high power vortex beam generation, but also promotes the application prospect in various fields.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Feng Li, Dongmei Huang, K. Nakkeeran, J. Nathan Kutz, Jinhui Yuan, P. K. A. Wai
Summary: This paper investigates the Eckhaus instability in laser cavities with harmonically swept filters, showing that it is triggered by the cavity dispersion-induced continuous frequency shift. The repeated triggering of the Eckhaus instability is the dominant effect that leads to high frequency fluctuations in FDML laser output, limiting signal quality.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Quan Sheng, Aihua Wang, Jingni Geng, Shijie Fu, Yuanyuan Ma, Wei Shi, Jianquan Yao, Takashige Omatsu, David Spence
Summary: In this study, ultra-high-order LG beams with m beyond 300 were generated using the spherical aberration of a lens in a simple end-pumped Nd:YVO4 laser at 1064 nm, providing a simple and flexible method to convert a wide range of lasers to generate ultra-high-order LG modes.
LASER & PHOTONICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Xinlian Chen, Kaiyang Wang, Bori Shi, Tanghao Liu, Riming Chen, Mengying Zhang, Weijia Wen, Guichuan Xing, Jinbo Wu
Summary: By preparing an all-inorganic perovskite nanorod array with random sizes, all-photonic cryptographic primitives were generated, leading to a highly secure encryption technology. The study found a positive correlation between the lasing mode number and the nanorod length, which can be transformed into a key array following encoding rules, demonstrating superior lasing stability under continuous excitation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Shuang Wang, Xiao Liu, Haiyan Wang, Guijun Hu
Summary: We propose and experimentally demonstrate a high-order mode fiber laser based on few-mode fiber gratings. The laser can achieve simultaneous lasing of different modes at the same wavelength and different modes at different wavelengths, making it suitable for mode-division multiplexing-wavelength-division multiplexing optical communication systems.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Tianlang Chen, Chunxiang Xu, Daotong You, Ru Wang, Yizhi Zhu, Jinping Chen, Qiannan Cui, Zengliang Shi
Summary: This study successfully achieved low threshold and high quality factor of CsPbBr3 single-mode micro-laser by selecting proper sized CsPbBr3 single crystal microdisks and introducing surface plasmon of detachable Pt nanoparticles on the microcavity.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Wei Li, Zhiping Yan, Shuai Ren, Yu Deng, Yisha Chen, Pengfei Ma, Wei Liu, Liangjin Huang, Zhiyong Pan, Pu Zhou, Lei Si
Summary: This paper investigates the performance of a confined-doped active fiber fabricated in-house for all-fiber high-power single-frequency amplifiers. A 210-W single-frequency single-mode fiber laser is obtained, confirming the excellent performance of the confined-doped active fiber. The power scalability of the fiber amplifier is further demonstrated through the application of a temperature gradient along the active fiber, resulting in up to 75% enhancement of the stimulated Brillouin scattering (SBS) threshold. A 368-W single-frequency fiber laser with a beam quality factor of Mx2.1.19, My2.1.26 is achieved. Overall, the confined-doped active fiber technique shows promise for scaling the output power of single-frequency single-mode fiber lasers.
Article
Optics
Hanshuo Wu, Jiangtao Xu, Liangjin Huang, Xianglong Zeng, Pu Zhou
Summary: A hundred-watt-level spatial mode switchable all-fiber laser is demonstrated using a master oscillator power amplifier scheme. Real-time mode switching between the LP01 and LP11 modes with millisecond scale switching time is achieved through an acoustically induced fiber grating (AIFG) driven by radio frequency modulation. This work serves as a good reference for practical applications of high-power agile mode switchable fiber lasers.
CHINESE OPTICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Jiajia Feng, Jiaqi Zhou, Jiangtao Xu, Yan Feng, Xianglong Zeng
Summary: We present a scheme to generate broadband first-order linear polarization (LP11) modes and optical vortex beams (OVBs) by connecting a broad long-period fiber grating (BLPFG) inside and outside a figure-9 femtosecond mode-locked (ML) fiber laser. The scheme achieves broadband mode conversion in a two-mode fiber (TMF) and produces high purity output signals.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Ao Yang, Jie Zhu, Xiaomin Liu, Mengjun Xu, Fan Shi, Jiangtao Xu, Fufei Pang, Xianglong Zeng
Summary: Two methods for generating doughnut beam arrays and hollow Bessel-like beams based on all-fiber structures are demonstrated using mode-selective couplers. The advantages of compactness, flexibility, and easy integration with free-space optical systems make these methods highly significant for applications in super-resolution microscopy, laser material processing, and optical trapping.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Haocun Wu, Jiangtao Xu, Yi Zhu, Xianglong Zeng
Summary: We demonstrate a programmable high-order mode control method that can be implemented in high-power fiber lasers. By working in the regime of dissipative soliton resonance, we achieve 2 W average-power mode-locked pulses using a mode-locked fiber laser. The fundamental mode (LP01) is converted to high-order modes (LP11a/b) using an acoustically-induced fiber grating. The mode superposition fields are recorded and analyzed using an optical 4f system and a mode decomposition algorithm, respectively. Our experiments show stable and dynamically switchable mode patterns. This method is expected to have significant application value in optical tweezers, fiber communication, laser material processing, and other research fields.
Article
Optics
Zhengwei Zhang, Jiangtao Xu, Longkun Zhang, Linping Teng, Jianfeng Sun, Xianglong Zeng
Summary: This article demonstrates two all-fiber low-frequency shift schemes based on acousto-optic interaction in a few-mode fiber (FMF). The schemes achieve efficient conversion between LP11 and LP01 core modes in the FMF, resulting in frequency shifts. Additionally, a heterodyne detection system based on these schemes is proposed and validated for the detection of micro-vibration and speech signals.
Article
Optics
Qian Yao, Weiyi Yin, Heng Yao, Huiqiang Shi, Zihuai Su, Xianglong Zeng, Xiaoning Shi, Wancong Zhao, Ye Dai
Summary: This paper studies the morphology change of etched microchannels in fused silica by controlling the laser scan speed. It is found that there is a significant difference between the chemical etched length and volume. The fabricated microchannels gradually become tapered along the scan direction.
Article
Optics
Jiafeng Lu, Enrique Garcia-Caurel, Razvigor Ossikovski, Francois Courvoisier, Xianglong Zeng, Bertrand Poumellec, Matthieu Lancry
Summary: Chirality transfer from femtosecond laser direct writing in achiral transparent materials is caused by the interplay between anisotropic nanogratings and mechanical stress with non-parallel and non-perpendicular neutral axes. However, laser fabrication also induces significant linear birefringence. To precisely manipulate circular polarization properties and minimize linear birefringence, we propose a geometry-inspired multilayer method for direct writing of chiral waveplates. Theoretical analysis shows that our method achieves strong circular birefringence and provides a facile platform for chiral device exploration with minimal linear property existence.
Article
Optics
Liang Zhang, Zizhou Wei, Yichun Li, Haozhe Shou, Han Wang, Mengshi Zhu, Xianglong Zeng, Wei Chen, Fufei Pang, Tingyun Wang
Summary: We present a narrow-linewidth high-order-mode Brillouin random fiber laser utilizing a long-period fiber grating and distributed Rayleigh random feedback in a half-open linear cavity. The laser achieves single-mode operation with a sub-kilohertz linewidth through distributed Brillouin amplification and Rayleigh scattering along kilometer-long single mode fibers, while LPFGs based on few-mode fibers enable transverse mode conversion over a broadband wavelength range. Additionally, a dynamic fiber grating is embedded to manipulate and purify the random modes, suppressing the frequency drift resulting from random mode hopping. As a result, the laser outputs high-order scalar or vector modes with a high efficiency of 25.5% and an ultra-narrow 3-dB linewidth of 230 Hz. Experimental investigations also explore the dependence of laser efficiency and frequency stability on the gain fiber length. This approach has promising potential for various applications including coherent optical communication, high-resolution imaging, and highly sensitive sensing.
Article
Optics
Yang Li, Haoguang Yao, Chenchen Fan, Xiulu Hao, Tianfu Yao, Pu Zhou, Xianglong Zeng
Summary: Researchers have demonstrated an all-fiberized random distributed feedback Raman fiber laser (RRFL) with modulation-induced wavelength manipulation and dual-wavelength generation. By using an electrically controlled intra-cavity acoustically-induced fiber grating (AIFG), the input modal content at the signal wavelength can be adjusted. The power output exceeds 47W with good stability and repeatability. It is the first dual-wavelength fiber laser based on mode modulation and has the highest output power ever reported for an all-fiberized continuous wave dual-wavelength fiber laser.
Article
Optics
Xiaoning Shi, Wancong Zhao, Yi Zhu, Changyu Shen, Xianglong Zeng
Summary: This article experimentally demonstrates polarization multiplexing schemes in a tilted fiber grating (TFBG) for achieving polarization-independent fiber-optic surface plasmon resonance (SPR) sensors. Two orthogonal polarized lights separated by a polarization beam splitter (PBS) were used to excite SPR in the Au-coated TFBG in two opposite directions, while another method involved using a Faraday rotator mirror (FRM) to achieve polarization multiplexing for SPR effect. The resulting SPR reflection spectra were independent of the light source and fiber perturbations due to the superposition of p- and s-polarized transmission spectra. A polarization-independent TFBG-based SPR refractive index (RI) sensor with high sensitivity was obtained.
Article
Nanoscience & Nanotechnology
Mengdie Hou, Mengjun Xu, Jiangtao Xu, Jiafeng Lu, Yi An, Liangjin Huang, Xianglong Zeng, Fufei Pang, Jun Li, Lilin Yi
Summary: We demonstrate the first simulation and experimental realization of decomposing cylindrical vector (CV) and orbital angular momentum (OAM) modes by reconstructing multi-view images of the projected intensity distribution. The use of deep learning-based stochastic parallel gradient descent (SPGD) algorithm allows for the retrieval of modal coefficients and optical field distributions with high efficiency and accuracy. The generated donut modes are experimentally decomposed into CV and OAM modes, with a purity of 99.5% for CV modes. Rapid switching of vortex modes is achieved by electrically driving the polarization controller. Our findings provide a convenient way to characterize and deepen the understanding of CV or OAM modes, with potential applications in information coding and quantum computation.
Article
Optics
Jiafeng Lu, Mostafa Hassan, Francois Courvoisier, Enrique Garcia-Caurel, Francois Brisset, Razvigor Ossikovski, Xianglong Zeng, Bertrand Poumellec, Matthieu Lancry
Summary: Polarization manipulation is crucial for unlocking the versatility of light manufacturing, and existing techniques only focus on two-dimensional control. In this paper, we present a novel passive strategy using femtosecond laser written birefringent elements to shape polarization along the optical path. We demonstrate the generation of a three-dimensional structured Bessel beam with a slowly evolving polarization state, enabling the imprinting of twisted nanogratings and high optical rotation. Our work provides new perspectives on three-dimensional polarization manipulation and insights into applications in structured light and chiral device fabrication.
Article
Optics
Xiaobo Xue, Qi Jiang, Fufei Pang, Jianxiang Wen, Wei Chen, Xianglong Zeng, Liang Zhang, Heming Wei, Tingyun Wang
Summary: An all-fiber fiber coupler was developed for amplification of orbital angular momentum (OAM) modes by side-polishing and bonding a ring-core erbium-doped fiber (RC-EDF) and a pre-tapered side-polished single-mode fiber (SMF). The pumping laser was efficiently coupled into the RC-EDF from the SMF for the selected phase-matching condition at 976 nm, and the 1st to 3rd-order OAM mode signals were transmitted with low insertion loss in the RC-EDF over a wide wavelength range. The proposed side-polished pumping coupler technique enables high-order OAM mode amplification, making it promising for all-fiber optical amplifiers in high-capacity modal-division multiplexing fiber communication systems.
Article
Optics
Shufei Han, Shengli Pu, Zijian Hao, Chencheng Zhang, Weinan Liu, Simiao Duan, Jiaqi Fu, Mingjue Wu, Peiwen Mi, Xianglong Zeng, Mahieddine Lahoubi
Summary: A novel vector magnetic field sensor with temperature compensation is proposed and investigated in this study. The sensor is realized by side-polishing a multi-mode optical fiber and adopting the surface plasmon resonance effect. It can be used for magnetic field strength and direction sensing, as well as temperature detection. The sensor exhibits easy fabrication, high sensitivity, and temperature compensation ability.
Article
Engineering, Electrical & Electronic
Xuan Zhou, Fan Shi, Jiafeng Lu, Mengjun Xu, Mengdie Hou, Mischa Bonn, Xiaomin Liu, Xianglong Zeng
Summary: This paper proposes a method for producing femtosecond visible doughnut beams by integrating nonlinear frequency conversion and in-fiber mode conversion techniques. This method allows for dynamic manipulation of vector visible beams in optical fibers.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
