OPTICS AND LASER TECHNOLOGY
·
2017
·
IF 2.109
Jiangyun Dai,Guoying Feng,Shutong Wang,Hong Zhang,Shengyu Dai,Shouhuan Zhou
By using femtosecond-pulsed laser to ablate the larger nanosized target in liquid, stable transparent NaGdF 4 :Nd 3+ colloid has been successfully fabricated. The X-ray diffraction (XRD) spectra reveal that the colloidal nanoparticles remain the hexagonal phase crystal structure of NaGdF 4 powder target. SEM and TEM images results indicate that the size of these colloidal nanoparticles decreases sharply. FT-IR results indicate that the number of O–H and C–H groups on the surface is decreased. The emission properties of the colloid have been investigated using 794 nm pulsed wave laser radiation , and it is found that the colloid exhibits near-infrared luminescent emissions in the spectral range of 850–1400 nm, and the decay time for 4 F 3/2 → 4 I 11/2 (1058 nm) Nd 3+ ion transitions is lengthened than that of powder target, these results are probably due to the reduced nonradiative relaxation assisted by high energy oscillators . The observed near-infrared emission of the stable transparent colloid makes it a good candidate for application in liquid laser .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 23
·5038
·
IF 2.217
Xue-Ran Deng,Wei Yang,Hao-Hao Hui,Qing-Hua Zhang,Qiao Xu,Jin-Ju Chen,Ji-Liang Zhu,Xiang-Yang Lei
A high-power laser system is employed to drive the fusion ignition to realize sustainable supply of green energy according to the inertial confinement fusion theory, in which frequency-converting crystals are sealed in the terminal vacuum chamber and utilized to turn the incident laser (1053 nm) to the desired one (351 nm). However, the reflected 351 nm laser from the pellet hohlraum that goes back through the frequency-converting crystal is found to be harmful for the upstream elements that are located before the terminal chamber. In this study, a specialized coating system for the frequency-converting crystals was designed and fabricated to both ensure high output power for the fusion and reduce the reflected 351 nm laser energy by absorption. Furthermore, the structural, mechanical, and laser-damage resistant properties of this coating were investigated as well.Keywords:high-power laser system;frequency-converting crystal coating;reflected 351 nm laser
研究领域:
光学材料
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 39
·2103065
·
IF 13.281
Wei Gao,Ting Wang,Jiangtao Xu,Ping Zeng,Wenfei Zhang,Yunduo Yao,Changsheng Chen,Mingjie Li,Siu Fung Yu
The advantage of using flexible metallic structures as the substrate of flexible lasers over plastic materials is its strong mechanical strength and high thermal conductivity. Here, it is proposed to deposit CsPbBr 3 perovskite quantum dots onto Ni porous foam for the realization of flexible lasers. Under two-photon 800 nm excitation at room temperature, incoherent random lasing emission is observed at ≈537 nm. By external deformation of the Ni porous foam, incoherent random lasing can be tuned to amplified spontaneous emission as well as the corresponding lasing threshold be controlled. More importantly, it is demonstrated that the laser is robust to intensive bending (>1000 bending cycles) with minimum effect on the lasing intensity. This flexible laser is also shown to be an ideal light source to produce a “speckle” free micro-image.
研究领域:
光学
·
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS LETTERS
·
2020
·Vol. 45
·期 5
·1047-1050
·
IF 3.714
Guoquan Qian,Wenlong Wang,Guowu Tang,Xianchao Guan,Wei Lin,Qi Qian,Dongdan Chen,Changsheng Yang,Jiantao Liu,Guiyao Zhou,Shanhui Xu,Zhongmin Yang
In this work, Tm:YAG (Tm:${{\rm Y}_3}{{\rm Al}_5}{{\rm O}_{12}}$) ceramic-derived multimaterial fiber was fabricated by using the molten core method, which has a high gain per unit length of 2.7 dB/cm at 1950 nm. To our knowledge, this is the highest gain per unit length at 2 µm band in similar Tm:YAG-derived multimaterial fibers. A distributed Bragg reflector (DBR) fiber laser was built based on a 10-cm-long as-drawn fiber. The achieved 1950 nm laser, which has a maximum output power of $\sim{240}\;{\rm mW}$ and a slope efficiency of 16.5%, was pumped by a self-developed 1610 nm fiber laser. What is more, an all-fiber-integrated passively mode-locked fiber laser based on the 10-cm-long as-drawn fiber was realized. The mode-locked pulses operate at 1950 nm with duration of $\sim{380}\;{\rm ps}$, and the repetition rate is 26.45 MHz. The results described here indicate that the Tm:YAG ceramic-derived multimaterial fiber with high gain per unit length has promising applications in 2 µm all-fiber fiber lasers.
研究领域:
光学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuang Chen,Yang Zou,Lili Zhao,Zijian Lei,Nan Wang,Lixin Song
Laser stealth and laser protection are a contradictory due to the opposite requirement in reflectivity. Introducing nonequilibrium surface oxygen vacancy into high-reflectivity materials is a method to compatibly realize laser stealth and laser protection. Herein, nonequilibrium surface oxygen vacancy is introduced into the titanium-based perovskite materials (CaTiO 3 , SrTiO 3 , BaTiO 3 ) producing high-absorption materials with reflectivity below 10%, and the materials possess an optical transformation property. The distribution of the oxygen vacancy is characterized by TEM and EELS, and a core-shell structure is observed, with a disordered shell covering a crystalline core. Under laser irradiation, the materials can transform to high-reflectivity state and reflect most of the laser energy to prevent laser damage. Among these materials, BaTiO 3 possesses the fastest transformation rate of 2000 ms and the highest reflectivity of 70%, which is ascribed to the low thickness of the disordered shell and the fast diffusion coefficient of the oxygen atom.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 6
·3550-3556
·
IF 3.9
Feng Tian,Nan Jiang,Yang Liu,Zhengfa Dai,Tengfei Xie,Dariusz Hreniak,Jiang Li
To suppress heat effects in a high-power laser system, it has been proposed to use a few composite laser gain media to improve the heat management ability. The surface-gain structure has the advantages of both slab and thin-disk configurations, which has huge potential in high-power laser. For the first time, novel composite laser ceramics with surface-gain structure have been fabricated by tape casting and sintering technology. The in-line transmittances of surface-gain ceramics in 1100 and 400 nm are 83.5% and 79.1%, respectively. According to the laser ablation–coupled plasma mass spectrometry, the diffusion distance of Yb 3+ is about 150 µm. The laser experiment yields a low repetition rate pulse of 1.9 J with a pump absorption energy of 11 J and an optical-to-optical conversion efficiency of 17.2%.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2023
·
IF 11.5
Rahul A. Rajan,Huang Tao,Weili Yu,Jianjun Yang
Femtosecond laser processing of lead halide perovskites has recently sparked wide popularity for creating various micro/nanostructures and instigating interesting properties. However, it is still lacking detailed insights into correlating the laser induced morphology and defect chemistry of perovskite materials to their light emitting properties. Here, the space-resolved photoluminescence and lasing behaviors are investigated for both the single crystal (SC) and polycrystalline (PC) perovskites upon femtosecond laser ablation . In the case of SC sample, three different regions based on the laser ablation , recast deposition, and modification respectively exhibits distinguished carrier recombination mechanisms due to their variable defect chemistries and morphologies identified, which helps to realize the amplified spontaneous emission with the recrystallized micro/nanostructures. On the other hand, the laser modified region on the PC sample reveals the significant enhancement of random lasing performance (the lasing threshold was reduced by ∼7 times and the slope efficiency increased by ∼1.5 times), which is attributed to the femtosecond laser induced non-radiative defect passivation and the average crystalline grain size reduction by more than 1.5 times. This study unveils the physical and chemical modification effects of the femtosecond laser irradiation on perovskite materials, and thus is an optimal strategy to fabricate desired perovskite light-emitting microstructures by ultrafast laser processing.
研究领域:
材料科学
·
光学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Xiaotong Zhao,Mo Liu,Niannian Xu,Shunbin Wang,Pengfei Wang
This study presents the experimental realization of a microsphere laser resonator designed to operate within the approximate wavelength range of 1.2 μm and 2.0 μm. This resonator, employing a Ho 3+ -doped fluoroaluminate glass microsphere, was stimulated by a 1150 nm laser, marking the first demonstration of its kind. The observed laser emissions at ∼1.2 μm and ∼2.0 μm were ascribed to the transitions of Ho 3+ ions, specifically 5 I 6 → 5 I 8 and 5 I 7 → 5 I 8 , respectively. The fabrication of the microsphere, possessing a characteristic diameter of approximately 50 μm, entailed the controlled melting of a fluoroaluminate glass filament through the application of a focused CO 2 laser beam. Concurrently, a tapered fiber with a waist diameter of ∼2 μm was created by subjecting a standard silica single-mode fiber to a process of controlled heating and stretching. The findings of this investigation suggest promising prospects for the development of multi-wavelength lasers utilizing fluoroaluminate glass microspheres, particularly in intricate environmental settings.
研究领域:
光学
·
材料科学
·
激光技术
✓ 已验证
DOI
高影响因子
Optical Materials Express
·
2015
·Vol. 5
·期 2
·330-339
·
IF 2.844
Dongbi Bai,Wenxue Li,Xianghui Yang,Xuewei Ba,Jiang Li,Yubai Pan,Heping Zeng
We report on the continuous-wave and tunable laser operation of a transparent Yb:YAG ceramic which is prepared by non-aqueous tape casting method with vacuum sintering at 1750 °C for 10 h. The Yb:YAG ceramic is dense and with excellent optical in-line transmittance characteristics. In the lasing experiment, the Yb:YAG is end-pumped by a high-brightness 974 nm diode pump in fiber core of 50 μm and numerical aperture of 0.22, which results in a maximum output power of 7.01 W and a slope efficiency of 60.2% at 1050 nm. A smooth tunable curve from 1022 nm to 1058 nm is achieved in tunable laser testing, revealing the broadband lasing spectra over 30 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Cong Zhao,Qianxiong Wen,Shuyang Bao,Shuang Pan,Weidong Xiang,Xiaojuan Liang
Solid-state laser lighting has gradually become dominant in the display and illumination market, benefiting from its high efficiency and ultrahigh luminescence properties. Herein, by intelligently designing glass components and minor BN addition, a high-transparency and heat-resistant phosphor-in-glass film (PiGF) (a zero-thermal-quenching phenomenon) is realized. Further, in an attempt to take into account both the excellent luminous performance and the high quality of the light colors, a uniquely designed tricolor pattern of PiGF (THP-PiGF) was fabricated as an alternative to high-power white laser illumination. Under the excitation of a 450 nm blue laser diode (LD), a luminous efficiency (LE) of 159.87 lm/W with high color rendering index (CRI = 87.2) is achieved at 9.32 W/mm2. THP-PiGF with ultrahigh thermal conductivity (16.984 W/(m K)) can withstand a long operation time of 300 min under constant incident blue laser illumination. With respect to practical applications, a high-power laser module (maximum power 74 W) is assembled with the unique PiGF which can emit an interesting THP. These contributions can substantially drive the development of state-of-the-art laser light illumination.
研究领域:
材料科学
·
光电技术
·
光子学
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Junfeng Cheng,Zhixiong Lin,Dun Wu,Chunlin Liu,Zheng Cao
Porous carbon materials show great application potential in the field of adsorption. However, the preparation process of carbon adsorption materials relies on high temperature, high energy consumption, many steps, and long time. Most of them exist in the form of powder or block, and the practical application scenarios are limited and difficult to recycle. In this study, based on in-situ carbonization of polymer precursor, we directly generated laser-induced graphene (LIG) on the surface of commercial aramid textile using a low-energy near-infrared laser in air, and prospected the application prospect of the prepared aramid/graphene textile in the field of adsorption. Under a certain laser energy, the photothermal reaction promotes the breaking of the C O and C N bonds in the surface layer of the aramid fiber , and reorganizes into a graphene structure at an instantaneous high temperature, while the overall flexible structure of the textile was not destroyed. Further, adsorption materials based on the as-prepared aramid/graphene textiles were also designed, including VOC-adsorbing textile in air and dye-adsorbing textile in water. Using low-energy near-infrared laser to directly achieve LIG writing in commercial textiles under air condition will provide an efficient, environmentally friendly, and designable direction for the large-scale fabrication of textile adsorption products.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NATURE
·
2025
·
IF 48.5
Zou Chen,Ren Zhixiang,Hui Kangshuo,Wang Zixiang,Fan Yangning,Yang Yichen,Yuan Bo,Zhao Baodan,Di Dawei
Solution-processed semiconductor lasers promise lightweight, wearable and scalable optoelectronic applications. Among the gain media for solution-processed lasers, metal halide perovskites stand out as an exceptional class because of their ability to achieve wavelength-adjustable, low-threshold lasing under optical pumping 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 . Despite the progress in this field, electrically driven lasing from perovskite semiconductors remains a critical challenge. Here we demonstrate an electrically driven perovskite laser, constructed by vertically integrating a low-threshold single-crystal perovskite microcavity sub-unit with a high-power microcavity perovskite LED (PeLED) sub-unit. Under pulsed electrical excitation, the dual-cavity perovskite device shows a minimum lasing threshold of 92 A cm −2 (average threshold: 129 A cm −2 , at about 22 °C, in air), which is an order of magnitude lower than that of state-of-the-art electrically driven organic lasers 9 , 10 . Key to this demonstration is the integrated dual-cavity device architecture, which allows the microcavity PeLED sub-unit to deliver directional emission into the single-crystal perovskite microcavity sub-unit (at a coupling efficiency of about 82.7%) to establish the lasing action. An operational half-life ( T 50 ) of 1.8 h (6.4 × 10 4 voltage pulses at 10 Hz) is achieved, outperforming the stability of electrically pumped organic lasers 9 , 10 . The dual-cavity perovskite laser can be rapidly modulated at a bandwidth of 36.2 MHz, indicating its potential for data transmission and computational applications.
研究领域:
光电子学
·
光子学
·
半导体物理
·
材料科学
·
应用物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）