获得单横模的简单方案

来源 :激光与光电子学进展 | 被引量 : 0次 | 上传用户:xxn1954
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
在许多激光应用中,要求把激光聚焦到衍射极限。对稳定腔激光器而言,这意味着激光器以TEM00模或横模工作。由于环形光边缘有衍射环,这问题本质上是较复杂的。
其他文献
In this paper, an experimental scheme for cordwood color division multiplexing (CDM) visible light communication (VLC) system is proposed. The principle and structure of the experimental scheme are described. Right angle prisms and band-pass filter are us
期刊
对微结构光纤中基于四波混频(FWM)效应的全光波长变换进行了实验研究。利用长度为80 m的色散平坦高非线性微结构光纤实现了对重复频率为10 GHz,宽度为1.6 ps的脉冲序列的波长变换, 波长上转换和波长下转换均能在实验观中察到。另外, 对于脉冲光和连续光的光功率对转换效率的影响也进行了实验研究, 当功率相对比较高时, 无论是波长上转换还是波长下转换, 转换效率都比较高, 并且随着输入微结构光纤的光功率的降低, 转换效率相应减小; 波长下转换受到脉冲光功率的影响比较明显。
利用射频磁控溅射方法在不同衬底上制备出掺Y2O3 8 %的YSZ薄膜, 用X射线衍射、原子力显微镜(AFM)、扫描电子显微镜和透射光谱测定薄膜的结构、表面特性和光学性能, 研究了退火对薄膜结构和光学性能的影响。结果表明:随着退火温度的升高, 薄膜结构依次从非晶到四方相再到四方和单斜混合相转变, AFM分析显示薄膜表面YSZ颗粒随退火温度升高逐渐增大, 表面粗糙度相应增大, 晶粒大小计算表明, 退火温度的提高有助于薄膜的结晶化, 退火温度从400 ℃到1100 ℃变化范围内晶粒大小从20.9 nm增大到42
最近,一些科技工作人员报告了用激光观测上层大气的实验结果,他们探测了流星尘及气溶胶层。用激光代替普通的无线电波的优点是能荻得较高的能量密庋及中性粒于的反射。由此看来,激光对于观测中性流星尘密庋、真正的上层大气流、夜辉光及其与各种气象现象的关系是很有利的。
期刊
A novel design of multimode light power splitter is proposed and fabricated by using secondary asymmetric Y branches. An almost equally divided output among output terminals is obtained experimentally. Maskless laser direct writing technique is applied in
We apply graph matching method to detect infrared small moving targets using image sequences. Candidates (interest points) detected in the first frame form one graph and the same candidates in the last frame form another one. The real moving targets are e
为了研制出高质量光学表面的离轴非球面碳化硅反射镜,提出一套包括铣磨成型、研磨、粗抛光、表面改性以及精密抛光等工序的完备的离轴非球面碳化硅反射镜加工工艺规范。采用Ultrasonic 100-5数控加工机床直接将Φ600 mm碳化硅反射镜铣磨成离轴非球面,铣磨后反射镜面形精度的峰谷(PV)值为17.17 μm。利用计算机控制光学表面成型(CCOS)技术对离轴非球面碳化硅反射镜进行研磨和粗抛光,使其面形精度的均方根(RMS)值达到0.102λ(λ=0.6328 μm)。采用离子束辅助沉积(IBAD)表面改性技
The perturbation theory of matrices is applied to ray transfer matrices (RTMs) to describe an optical component with aberration. A quantitative description of the perturbation extent corresponding to aberration strength is provided using condition numbers
An ultraviolet (UV) Raman lidar system at 354.7 nm has been developed for accurately measuring the aerosol extinction profiles. A spectroscopic filter combining a high-spectral-resolution grating with two narrowband mirrors is used to separate the vibrati
The combination of lens and pinhole limits the enhancement of the laser output power in the high-power laser system. Low-pass spatial filter without focusing can surmount the drawbacks of the pinhole filters. The low-pass spatial filters based on multilay