Author Affiliations
Abstract
1 School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China
2 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
The cavity ring-down (CRD) technique is adopted for simultaneously measuring s- and p-polarization reflectivity of highly reflective coatings without employing any polarization optics. As the s- and p-polarized light trapped in the ring-down cavity decay independently, with a randomly polarized light source the ring-down signal recorded by a photodetector presents a double-exponential waveform consisting of ring-down signals of both s- and p-polarized light. The s- and p-polarization reflectivity values of a test mirror are therefore simultaneously determined by fitting the recorded ring-down signal with a double-exponential function. The determined s- and p-polarization reflectivity of 30° and 45° angle of incidence mirrors are in good agreement with the reflectivity values measured with the conventional CRD technique employing a polarizer for polarization control.
310.0310 Thin films 310.6860 Thin films, optical properties 120.0120 Instrumentation, measurement, and metrology Chinese Optics Letters
2017, 15(5): 053101
1 中国科学院光电技术研究所, 四川 成都 610209
2 中国科学院大学, 北京 100049
3 电子科技大学光电信息学院, 四川 成都 610054
氩气和氮气被广泛用作增材制造中的保护气体, 但局部高温及材料中的氧逸出等因素会导致熔融区附近的氧含量与保护气体中的氧含量存在差异, 提出采用激光诱导击穿光谱技术检测熔融区附近的痕量氧含量。通过实验测量氧气/氩气和氧气/氮气的击穿光谱, 结合氧原子谱线强度与连续背景强度的比值, 获得了氩气和氮气中痕量氧含量的检测定标曲线, 得到氩气和氮气中氧体积分数的检测限分别为31×10-6和41×10-6; 通过分析等离子体的形成和衰退过程发现, 氩气等离子体的电子温度比氮气等离子体的高, 其衰减比氮气等离子体缓慢, 因此在相同的实验条件下, 氩气等离子体中的氧原子谱线强度和信噪比均比氮气等离子体的高, 从而使得氩气中氧含量的检测限低于氮气中氧含量的检测限。
光谱学 激光诱导击穿光谱 痕量氧含量 定量分析 检测限 中国激光
2017, 44(10): 1011001
1 中国科学院光电技术研究所，成都 610209
2 电子科技大学 光电信息学院，成都 610054
本文从测试腔长与初始腔长不一致、探测器耦合方式分析了连续光腔衰荡技术测量超高反射率元件损耗的误差。测量结果表明，在635 nm 波长，常规1 000 级超净实验室空气损耗系数约10 ppm/m，当测试腔长比初始腔长长20 cm 时，导致测试样品损耗测量结果偏大约2 ppm。另外，当采用交流(AC)耦合方式探测CRD 信号时将使衰荡信号波形失真，通过实验对比直流(DC)耦合和AC 耦合结果，发现采用AC 耦合将使损耗测量结果偏低约2 ppm。实验结果与分析表明测量超高反射率元件损耗时应保证测试腔腔长与初始腔腔长一致，并且采用足够带宽的直流耦合探测方式。
光腔衰荡 高反射率测量 空气损耗 耦合方式 cavity ring-down optical loss air loss detection coupling scheme
1 湖北文理学院 物理与电子学院, 襄阳 441053
2 中国地质大学(武汉) 数学与物理学院, 武汉 430074
3 中国地质大学(武汉) 自动化学院, 武汉 430074
为了研究镜像磁光光子晶体在外磁场中透射谱的变化, 采用4×4传输矩阵法进行了理论分析和模拟计算。模拟结果显示, 当外磁场存在的情况下, 镜像光子晶体中存在的缺陷模会受到外磁场和光子晶体层数的影响, 分裂成两个模式, 这两个模式分别对应于原线性偏振光中的左旋光和右旋光, 且左旋光和右旋光之间的频率差会随着外加磁场的增强而增大; 只有当光子晶体结构多于7层时, 缺陷模才会具有较高的Q值, 这时模式的分裂现象才能被清晰地观察到。结果表明, 磁光光子晶体的这种可调谐性可以应用到新型的滤波器设计当中。
非线性光学 磁光效应 4×4传输矩阵法 镜像光子晶体 缺陷模分裂 nonlinear optics magneto-optical effect 4×4 transfer matrix method mirror photonic crystal defect-mode splitting
1 中国地质大学数理学院, 湖北 武汉 430074
2 中国地质大学信息技术中心, 湖北 武汉 430074
采用4×4 传输矩阵法研究了一维镜像结构光子晶体的应力效应，重点研究了应力导致的各项异性对缺陷模的影响。模拟结果显示，应力作用导致的晶体厚度的改变，将会导致透射谱中缺陷模的明显移动，缺陷模的移动和晶体厚度呈现线性关系。进一步研究证实，对于不同材料，应力作用导致的介质的各向异性将加强或削弱这一效应。在如今对传感器精度要求越来越高的情况下，光子晶体的这些特性在压力传感器的设计制作中显示出潜在的应用价值。
非线性光学 各向异性 4×4 传输矩阵法 镜像光子晶体 弹光效应 激光与光电子学进展
2015, 52(4): 041603
1 中国科学院光电技术研究所， 四川 成都 610209
2 中国科学院研究生院， 北京 100049
反卷积方法是提高光谱仪分辨率的重要手段。采用空域迭代反卷积和频域维纳滤波对多纵模激光器光谱进行数据仿真，并在不同光谱仪采样率条件下，比较了迭代反卷积和维纳滤波结果。仿真结果表明，迭代反卷积和维纳滤波可以有效消除光谱仪仪器响应函数引起的光谱展宽，提高光谱仪分辨率。在光谱仪采样率低的情况下，迭代反卷积的分辨率增强效果优于维纳滤波。随着采样率的增加，维纳滤波的误差小于迭代反卷积。实验分别测量了单纵模和多纵模632.8 nm He-Ne激光器光谱，并对测量结果进行反卷积处理。结果表明，低分辨率光谱仪测量的激光器光谱经反卷积处理后与高分辨率光谱仪直接测量结果一致。
光谱学 采样率 反卷积 分辨率 激光与光电子学进展
2012, 49(4): 043001
Author Affiliations
Abstract
Chemical warfare agents (CWAs) are recognized as serious threats of terrorist acts against the civilian population. Minimizing the impact of these threats requires early detection of the presence of CWAs. Cavity ring-down spectroscopy (CRDS) is an exquisitely sensitive technique for the detection of trace gaseous species. In this letter, the CRDS technique is employed using a pulsed quantum cascade laser for the detection of dimethyl methylphosphonate (DMMP). A limit of DMMP detection of approximately 77 ppb is achieved. The best achievable sensitivity that corresponds to noise-equivalent absorption is approximately 2 \times 10-7cm-1.
010.1030 Absorption 140.5965 Semiconductor lasers, quantum cascade 300.6270 Spectroscopy, far infrared Chinese Optics Letters
2012, 10(5): 050102
Author Affiliations
Abstract
1 Key Laboratory of Beam Control, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
An optical feedback cavity ring-down technique (OF-CRD), in which the retro-reflection of the ring-down cavity (RDC) is re-injected into the oscillator cavity of a Fabry-Perot diode laser and causes the spectral fluctuation of the diode laser, is developed for ultra-high reflectivity measurement of optical mirrors. Due to the optical feedback-induced spectral fluctuation, the spectral line of the diode laser is occasionally in resonance with one or more RDC modes, resulting in an enhancement of the coupling efficiency of the laser power into the RDC and the occurrence of resonance peaks in the amplitude of the CRD output signal. These resonance peaks are employed in a CRD experimental setup for high reflectivity measurement of optical mirrors at 1064 nm. In the CRD setup, a pair of cavity mirrors, with reflectivities higher than 99.99%, is used. The reflectivity of both cavity mirrors is determined to be 99.99606% with an uncertainty of only 0.00003%. With a folded cavity configuration, the reflectivities of three mirrors with incident angles of 0, 22.5, and 45 degrees, are measured, and the results are 99.9459±0.0004%, 99.9755±0.0005%, and 99.9621±0.0006%, respectively.
光腔衰荡 高反射率 光学反馈 二极管激光器 310.6860 Thin films, optical properties 120.5700 Reflection 140.5960 Semiconductor lasers Chinese Optics Letters
2010, 8(s1): 94
经过方形玻璃丝的加工、离子交换及成品的精密加工等过程，成功制出了方形自聚焦透镜．并采用聚焦成像和雅明干涉等方法对其光学特性进行测试，得出了方形自聚焦透镜本身所具有的一些特性：中心部分畸变较小，成像性能好；四个棱角内的球差较大，像质较差；折射率分布不具有旋转对称性，而是与方向和半径有关．
自聚焦透镜 方形自聚焦透镜 方形玻璃丝 聚焦法测试 GRIN lens Square GRIN lens Square glass stick Focusing method to test
