The Brillouin gain properties in a double-clad
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A novel optimization-based method for designing wavelet filter banks in image fusion is proposed. The filter bank design is formulated as a nonlinear optimization problem. The objective function of the optimization problem consists of both the performance
X-ray absorption spectroscopy is a well-accepted diagnostic for experimental studies of warm dense matter. It requires a short-lived X-ray source of sufficiently high emissivity and without characteristic lines in the spectral range of interest. In the pr
本文报道了单光子激发NO分子A2∑ (υ=0)能级的LIF光谱研究,其观测到A2Σ (o=0)→X2Ⅱ(1″=0～11)跃迁的12个振动带。运用两步激发的方法,研究了E2Σ (扣=0)能级激发后在紫外波段的LIF光谱,明显测量到了E2Σ (1=0)能级直接跃迁到基态X2Ⅱ的荧光振动带。
超精密位移测量技术不仅是精密机械加工的基础，在以摩尔定律飞速发展的芯片制造行业中也起到决定性的作用。以光栅栅距为测量基准的光栅位移测量系统被广泛应用于多维测量系统，光栅位移测量系统与激光位移测量系统相比，大大降低了对使用环境的湿度、温度和气压的要求。本文主要介绍了近年来国内外基于二维光栅的位移传感系统光学结构的发展现状，从零差式和外差式光栅干涉测量原理入手，综述了基于单块二维光栅的光学结构到多块二维光栅耦合设计的光学结构发展历程，对比分析了几种二维光栅位移测量系统的优缺点，并展望了二维光栅位移测量系统发展
为了获取高精度的月面高程,需要对激光器的指向误差进行准确估计。月球轨道激光高度计(LOLA)在轨工作期间,由于月球昼夜温度相差较大,夜晚的激光指向相对白天存在很大偏移。首先建立光斑偏离接收视场中心时探测器接收能量的理论模型,并基于该模型分析光斑偏移量与相对接收能量的理论关系,进而提出一种基于光斑能量的激光指向误差的估算方法。随后,使用测绘轨道期间(12个月)LOLA经过Aestuum地区产生的能量
The intensity difference squeezed state, which means that the fluctuation of the intensity difference between signal and idler beams is less than that of the corresponding shot noise level (SNL), plays an important role in high sensitivity measurement, qu
基于包含四波混频效应的耦合非线性薛定谔方程,采用Hirota双线性方法得到了其4-暗孤子解,并数值研究了其传输特性。结果表明:通过调控参数,可以分别获得4-暗孤子、3-暗孤子及暗孤子-反暗孤子组合,但孤子间的相互作用依然是弹性碰撞。