【摘 要】
：
A new kind of adaptive optics (AO) system, in which several low spatial frequency deformable mirrors (DMs) with optical conjugation relationship are combined to correct high-order aberrations, is proposed. The phase compensation principle and the control
【机 构】
：
InstituteofOpticsandElectronics,ChineseAcademyofSciences,Chengdu610209CollegeofOptoelectronicsScienc
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
A new kind of adaptive optics (AO) system, in which several low spatial frequency deformable mirrors (DMs) with optical conjugation relationship are combined to correct high-order aberrations, is proposed. The phase compensation principle and the control method of the combinational AO system are introduced. The numerical simulations for the AO system with two 60-element DMs are presented. The results indicate that the combinational DM in the AO system can correct different aberrations effectively as one single DM with more actuators, and there is no change of control method. This technique can be applied to a large telescope AO system to improve the spatial compensation capability for wavefront by using current DM.
其他文献
The principle of error vector magnitude (EVM) against modulator nonlinearity for vector modulation signal (VMS) transmission in radio-over-fiber (RoF) systems is theoretically and experimentally investigated. A highly linear modulation scheme is proposed
一项新的被动锁模技术已在布鲁塞尔的弗雷大学用掺钕钇铝石榴石激光器演示成功，该技术把贝耳实验室的锁模研究和斯坦福大学约十年前研制的新式共振腔相结合。据该校的范赫泽尔（H. Vanherzeele)说，已观测到稳定的锁模脉冲序列，每个脉冲的宽度约15微微秒，这比以前用钇铝石榴石激光器得到的脉冲短得多。
研制了一种新型液相/电化学原子力显微镜（EC-AFM）系统。该EC-AFM系统的探头部分以激光作为光源, 设计了独特的液相光路, 采用了一块透明的玻璃作为视窗, 同时作为探针座, 将微探针和样品完全浸没在液体中进行扫描检测。设计了完全开放式的电解池, 可方便地改变样品的液体环境, 对电化学反应进行操作和控制。此外, 采取了探针扫描的方式, 使得较大和较重样品的扫描检测得以实现。利用该EC-AFM系统, 以铁片为阴极, 铜片为阳极在硫酸铜溶液中进行了化学镀铜实验, 并对实验过程进行了实时观察, 获得了不同阶
实验研究了乙醇分子的红外多光子离解特性。给出了离解速率与激光频率、激光能量、激光脉冲数、温度、初始气压的关系。离解阈值约为1.8焦耳/厘米2,观测到离解速率的极大值相对于其线性吸收峰向长波方向位移约8厘米-1。
We report Q-switched mode-locked (QML) pulses generation in an Yb-doped multimode fiber (MMF) laser by using a graphene-deposited multimode microfiber (GMM) for the first time, to the best of our knowledge. The single-wavelength QML operation with
A new class of fiber grating with only cladding index modulation is presented and analyzed theoretically. The calculation of the modes involved in this paper is based on a model of three-layer step-index fiber geometry. The transmission of a mode guided b
氟镓酸盐玻璃是一种性能良好的红外光窗材料。为了提升窗口观测、探测及防护性能，在氟镓酸盐基底上设计和制备了0.4～0.9 m、1.064 m、3.7～4.8 m三波段复合增透保护膜。根据光学性能及环境稳定性要求选择薄膜材料并对膜系进行了设计，然后利用电子束蒸发方法对多层膜进行了制备。测量结果表明，2.9 m处的水吸收峰拉低了中红外波段的透过率。通过改进工艺及后处理等途径提高了膜层致密度，有效抑制了膜层的水吸收。利用沸水浸泡法对镀膜元件的环境稳定性进行了实验验证。结果表明，经过离子束辅助沉积及退火处理的薄膜样
用光束脉冲矩阵法分析了多色光学谐振腔的稳定条件; 给出了计算腔内净群速度色散的准确表达式。 具体分析了一种新型自锁模谐振腔, 计算了它的腔内净群速度色散数值, 为研究它的锁模机理提供了可靠的数据。
氮素是作物生长发育和产量品质形成所必需的营养元素。实时、快速、无损、准确地监测作物氮素状况,对于诊断作物生长特征、指导合理施氮、提高氮肥利用效率、降低因过量施氮引起的农业面源环境污染等具有重要意义。解析了作物氮素营养无损监测的光谱学和生理生态学机理,研究了作物氮素光谱信息获取的原理和方法,设计并研制出便携式作物氮素无损监测光谱仪,并基于水稻田间试验数据对仪器进行了测试。结果表明,所研制的作物氮素无损监测光谱仪性能良好,能够适应田间的复杂环境和监测要求。