1 中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室，陕西 西安 710119
2 电磁空间安全全国重点实验室，天津 300308
硫系玻璃作为一种优秀的红外材料，具有透过范围广、物化性能稳定、易于成纤等特点，是制备红外传能光纤的理想材料之一。从硫系玻璃吸收损耗抑制和散射损耗抑制两方面入手，采用气（氯气）/气（玻璃蒸汽）、固（铝）/液（玻璃熔液）化学反应除杂方式降低光纤吸收损耗，建立了三维激光显微成像系统，检测玻璃及光纤内部的微米和亚微米量级的缺陷，优化制备工艺降低光纤散射损耗，制备出损耗为0.087 dB/m（@4.778 μm）的硫系玻璃光纤。分别利用光纤激光器（波长为2.0 μm）和双波长输出的光学参量振荡器（OPO）激光器（波长为3.8 μm 和4.7 μm）进行激光传能实验，在单模光纤和多模光纤中分别实现了6.10 W（@2.0 μm）和6.12 W（@3.8 μm和4.7 μm）激光传输。
材料 红外光纤 硫系玻璃 超低损耗 激光传输 激光损伤
1 长春理工大学 光电工程学院， 吉林 长春 130022
2 哈尔滨工业大学 物理学院， 哈尔滨 黑龙江 150001
3 长春理工大学 光电测量和光信息传输技术教育部重点实验室， 吉林 长春 130022
由于硫系玻璃具有良好的光学性质，在非线性光学等方面研究广泛，但基于硫系玻璃光电探测器的相关研究却很少。本文利用真空共热蒸发技术制备了不同掺银比例的硫系玻璃薄膜作为半导体膜层结构，并设计构建了金属-绝缘体-半导体结构的自供电光电探测器，探究了该光电探测器的响应光谱范围。结果表明，该探测器对可见光到近红外区域的光均有响应。针对掺银硫系玻璃光电探测器在635 nm波长激光下，研究了探测器响应电压与激发功率之间的关系。当激光功率小于10 mW时，探测器响应电压与激发功率线性相关；当激光功率大于10 mW时，探测器响应电压逐渐饱和。探测器的上升和衰减时间分别为3.932 s和1.522 s。本研究为硫系玻璃材料在自供电光电探测器领域的应用提供了证明。
硫系玻璃 光电探测器 金属-绝缘体-半导体 chalcogenide glass photodetector metal-insulator-semiconductor
1 Research Center for Humanoid Sensing, Zhejiang Lab , Hangzhou 311121, Zhejiang , China
2 State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, Guangdong , China
3 Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan , China
Glass with heavy doping of noble metal nanoparticles is expected to exhibit high optical nonlinearity. In this study, the effects of glass composition, structure, and heat treatment on the formation of silver nanoparticles (Ag NPs) in phosphate-bismuthate (PB) glass are investigated. By optimizing the chemical composition and preparation parameters, strong localized surface plasmon resonance is achieved in the PB glass with a silver mass fraction of more than 13%, which is 20 and 6 times higher than that in bismuthate and phosphate glasses reported previously, respectively. The high solubility of the phosphate component and the self-reduction effect of the bismuthate component jointly contributed to the stability and high content of Ag NPs in the PB glass. Z-scan measurements show that such heavy doping PB glass has a reverse saturable absorption coefficient of -14×10-12 m·W-1 and a saturable absorption coefficient of 4.94×10-12 m·W-1 at 800 nm. Furthermore, the heavy doping PB glass exhibits excellent thermal stability, making it promising for the fabrication of nonlinear optical fibers. In addition, with a heavily silver-doped PB glass rod as the core and a commercial silicate glass tube as the cladding, a composite glass fiber with high Ag-NP doping is successfully fabricated using a "molten-core" fiber drawing method.
phosphate-bismuthate glass silver nanoparticle optical nonlinearity molten-core fiber drawing 激光与光电子学进展
2024, 61(3): 0316006
Author Affiliations
Abstract
1 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
3 Key Laboratory of Vascular Aging, Ministry of Education, Tongji Hospital Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
4 State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
5 Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen 518063, China
Curvature sensing plays an important role in structural health monitoring, damage detection, real-time shape control, modification, etc. Developing curvature sensors with large measurement ranges, high sensitivity, and linearity remains a major challenge. In this study, a curvature sensor based on flexible one-dimensional photonic crystal (1D-PC) films was proposed. The flexible 1D-PC films composed of dense chalcogenide glass and water-soluble polymer materials were fabricated by solution processing. The flexible 1D-PC film curvature sensor has a wide measurement range of 33–133 m-1 and a maximum sensitivity of 0.26 nm/m-1. The shift of the transmission peak varies approximately linearly with the curvature in the entire measurement range. This kind of 1D-PC film curvature sensor provides a new idea for curvature sensing and measurement.
curvature sensor one-dimensional photonic crystals solution processing chalcogenide glass flexible film Chinese Optics Letters
2024, 22(2): 021601
Author Affiliations
Abstract
CEA CESTA, Le Barp, France
Mid-spatial frequency wavefront deformation can be deleterious for the operation of high-energy laser systems. When fluid cooled high-repetition-rate amplifiers are used, the coolant flow is likely to induce such detrimental mid-spatial frequency wavefront deformations. Here, we describe the design and performance of a 90 mm × 90 mm aperture, liquid-cooled Nd:phosphate split-slab laser amplifier pumped by flash-lamps. The performance of the system is evaluated in terms of wavefront aberration and gain at repetition rates down to 1 shot per minute. The results show that this single cooled split-slab system exhibits low wavefront distortions in the medium to large period range, compatible with a focus on target, and despite the use of liquid coolant traversed by both pump and amplified wavelengths. This makes it a potential candidate for applications in large high-energy laser facilities.
flash-lamp pumping high-power laser laser cooling neodymium glass wavefront error High Power Laser Science and Engineering
2024, 12(1): 010000e3
中国科学院上海光学精密机械研究所，上海 201800
掺镱大模场光子晶体光纤在高峰值功率超快激光放大器中有着重要的应用价值，其研究得到了广泛关注。首先简要介绍了国内外掺镱大模场光子晶体光纤的研究进展，阐述了掺镱大模场光子晶体光纤的基本设计思路，对比说明了保偏型掺镱光子晶体光纤的设计制备方法。重点介绍了近十年来中国科学院上海光学精密机械研究所在掺镱大模场光子晶体光纤方面的研究进展。包括掺镱大模场光子晶体光纤的纤芯折射率大小和均匀性控制、光子晶体光纤微结构控制等关键技术。采用自主研制的四种芯径为40~100 μm的掺镱大模场光子晶体光纤开展了皮秒脉冲激光放大实验。利用40 μm芯径的保偏掺镱光子晶体光纤实现了平均功率为100 W、光束质量因子（M2）小于1.4的稳定输出，偏振消光比为12 dB。利用100 μm芯径的保偏掺镱大模场光子晶体光纤实现了M2小于1.5的高光束质量脉冲放大。上述研究为掺镱大模场光子晶体光纤的国产化应用奠定了基础。
光纤光学 掺镱石英玻璃 大模场光子晶体光纤 皮秒脉冲激光放大 光纤激光
1 上海交通大学机械与动力工程学院，上海 200240
2 上海航天控制技术研究所，上海 201109
采用脉宽为8 ps的超快激光器，结合高速相机原位观测，研究了超快激光作用G5级多孔玻璃过程中的材料去除行为。研究结果表明：在超快激光作用下，多孔玻璃材料出现剥离去除现象，加工过程中有大量粒径为几十微米的颗粒飞溅，材料去除效率约为K9玻璃的16.2倍。分析了扫描策略和加工余量对多孔玻璃微锥阵列形貌特征的影响，实现了高一致性和大锥顶锐度微锥阵列加工，平均锥顶尺寸达到20 μm。组装后的电喷雾推力器能够在3 kV电压下获得单个发射极90 μN的推力。
激光技术 多孔玻璃 超快激光 微锥阵列 电喷雾发射极
