迎接二十一世纪的固体激光技术

本文评述了固体激光器及其应用的发展水平与动向，着重介绍了高平均功率，半导体二极管泵浦和可调谐固体激光技术的国际和国内的进展。     

关于国家固体激光工程技术研究中心的筹建情况

本文介绍了“国家固体激光工程技术研究中心”的筹建概况，包括“中心”的任务、近期发展重点及关键生产技术的投入情况，还介绍了“中心”管理委员会的人员组成。“中心”的筹建工作收于１９９４年底完成。     

固体激光技术研究

三十年来，华北光电技术研究所在固体激光技术方面持续地、系统地开展一系列研究工作，为工程应用打下了良好的基础。本文对其主要方面作一简要评述。     

固体激光材料研究的进展

本文评述了近期固体激光材料在高平均功率、高效率、可调谐、多波长等方面研究的进展。     

激光晶体的新发展

本文根据最新资料对固体激光器所用激光晶体的近期发展作了详尽综述，并对我国应如何发展激光晶体研究提出建议。     

State Estimation With Initial State Uncertainty

The problem of state estimation with initial state uncertainty is approached from a statistical decision theory point of view. The initial state is regarded as deterministic and unknown. It is only known that the initial state vector belongs to a specified parameter set. The (frequentist) risk is considered as the performance measure and the minimax approach is adopted. Minimax estimators are derived for some important cases of unbounded parameter sets. If the parameter set is bounded, a method of finding estimators whose maximum risk is arbitrarily close to that of a minimax estimator is provided. This method is illustrated with an example in which an estimator whose maximum risk is at most 3% larger than that of a minimax estimator is derived.     

State Amplification

We consider the problem of transmitting data at rate over a state-dependent channel with state information available at the sender and at the same time conveying the information about the channel state itself to the receiver. The amount of state information that can be learned at the receiver is captured by the mutual information between the state sequence and the channel output . The optimal tradeoff is characterized between the information transmission rate and the state uncertainty reduction rate , when the state information is either causally or noncausally available at the sender. In particular, when state transmission is the only goal, the maximum uncertainty reduction rate is given by . This result is closely related and in a sense dual to a recent study by Merhav and Shamai, which solves the problem of masking the state information from the receiver rather than conveying it.     

Parameter and State Estimation Algorithm for a State Space Model with a One-unit State Delay

This paper derives a state estimation based parameter identification algorithm for state space systems with a one-unit state delay. We derive the identification model of an observability canonical state space system with a one-unit state delay. The key is to replace the unknown states in the parameter estimation algorithm with their state estimates and to identify the parameters of the state space models. Finally, two illustrative examples are given to show the effectiveness of the proposed algorithm.     

n光子Fock态与相干态的迭加态光场的非经典效应

本文研究了n光子Fock态与相干态的迭加态光场的压缩效应与反聚束效应。结果表明,这种迭加态既可以存在无缩效应,又可以存在反聚束效应,而对这类迭加态压缩效应的存在和反聚效应的存在之间没有任何必然的联系。     

疲劳驾驶监控中的眼睛状态识别方法

介绍了一种对驾驶员眼睛状态进行准确识别的技术方法,先检测出人脸上半部区域,再采用AdaBoost算法检测出驾驶员正常睁开的眼睛,然后制成眉毛与眼睛组合在一起的睁眼状态模板.与未检测到眼睛的人脸上半部区域进行匹配,当该区域内的最大相似度值小于某设定阈值时认为眼睛是睁得很小或闭合状态,否则认为眼睛睁得正常.采用此方法可快速有效地识别出驾驶员的疲劳状态,并应用于驾驶状态的实时监控.     

基于UML状态图的类状态测试

在介绍UML状态图的基础上,以面向对象软件的类作为基本测试单元,研究了基于UML状态图的类状态测试技术,并在Eclipse平台上结合Java工具用手工选择测试数据进行了实例测试.     

基于W类态的未知两粒子纠缠态的量子隐形传态

提出了一种用W类态作为信道对未知二粒子纠缠态进行隐形传态的方案。通过研究表明，接受者只要采取适当的幺正变换的策略就可以实现概率性的隐形传态。     

基于W类态的未知两粒子纠缠态的量子隐形传态

提出了一种用W类态作为信道对未知二粒子纠缠态进行隐形传态的方案。通过研究表明,接受者只要采取适当的幺正变换的策略就可以实现概率性的隐形传态。     

固体薄片激光器和固体热容激光器

介绍了能够实现高平均功率的两种固体激光器：固体薄片激光器和固体热容激光器。给出了它们的工作原理和理论上的工作参数。综述了固体薄片激光器和固体热容激光器的研究历史和现状,指出了高平均功率固体激光器未来的发展方向。