准分子激光心血管治疗机的研究

研制了一台准分子激光心血管治疗机（ＸｅＣｌ３０８ｎｍ），单脉冲能量：８０－２００ｍＪ，平均功率５Ｗ，重复频率：手动单次，１－１００Ｈｚ，单次充气工作寿命：＞１０６脉冲数，脉冲－脉冲的能量不稳定度３％，激光脉宽１５０ｎｓ，光斑发散角（半角）：１．８×０．６ｍｒａｄ，光纤耦合输出＞２０ｍＪ。     

激光成型加工

元件的生产要求周期越来越短，质量越来越高，数量也越来越小。许多新的材料，诸如特种钢、陶瓷或复合材料，另外要求在生产技术中有很高的柔性。毫不奇怪，在产品供应的小中企业中，竞争越来越激烈。利用一种由德国夫琅霍费激光技术研究所开发的方法，能够获得这种与时间赛跑的成功：激光去除工艺可使最硬的工件自动成型，而无需要换刀具。     

Zygo公司再获百万美元激光核聚变光学合同

近日，Zygo公司宣布他们再次获得了一项激光核聚变项目的合同，订单最初价值约为1百万美元，预计纳入2007财年收入。合同还提供了可选择性订单．预计持续到2013年，估计总额达到4千5百万美元。Zygo公司是世界级光学度量仪器、精密光学仪器、电光学设计和制造设施供应商，为半导体固定设备和工业市场服务，其总部设在美国康涅狄格的Middlefield。     

Detecting emboli from Doppler ultrasound signals with the wavelet packet analysis method

A Doppler ultrasound analysis method based on wavelet package transform was proposed for embolic detection. The embolic Doppler signal was firstly decomposed using the wavelet packet. Then the sensitive characteristics were calculated from each sub-band signal and used in the emboli classification. This method was applied to analyze 300 cases simulated and 163 cases clinical Doppler signals. The minimum error ratio of embolic detection using this method was 13 percents lower than that using the traditional spectrogram analysis method.It was shown that this method overcame the limit between the time and frequency resolution in the short time Fourier transform, improved the accuracy of embolic detection greatly and extracted more reliable parameters for the clinical diagnosis.     

“十一五”压电陶瓷频率元器件发展趋势

压电陶瓷频率元器件包括滤波器、谐振器、陷波器、鉴频器等，已广泛应用于电子、激光、超声、通讯、导航、航天、自动控制、计量检测、精密加工、传感技术和引燃引爆等领域，成为当今高新技术的主要研究方向之一。“十五”期间列入新型电子元器件目录，是电子元器件发展的重点。     

Self-Mixing Interference in Dual-Polarization Microchip Nd：YAG Lasers

The self-mixing interference in dual-polarization microchip Nd: YA G lasers is demonstrated. Under optical feedback, the orthogonal polarization components of the laser would undergo antiphase intensity modulations; at high feedback level, the polarization switching appears. We also observe that the laser self-mixing sensitivity changes periodically with the frequency difference of orthogonal polarizations. An initial theoretical model is put out and agrees well with the experiments. The results are useful for self-mixing sensitivity enhancement and offer a new way of absolute distance measurement.     

改进了的光场—boson元激发非线性耦合的激光模型

在我们最近提出的光场Ｂ－ｂｏｓｏｎ元激发耦合激光模型的基础上，通过附加一个抽运系统的速率方程，将原先的激光动力学加以改进，以图整个系统的运作趋于更完备的远离平衡自组织。经过这样改动以后，改进后激光动力系统的速率方程组和描述光场与二能级原子相互作用的麦克斯韦－布洛赫方程组在形式上也有其更加相似之处；两者的自由变量与外控参量都有一一对应关系。     

LPI雷达数字信号处理系统匹配滤波器的设计与实现

简要介绍了一种新研制成功的低截获概率雷达高速数字信号处理系统。由于采用了海杂波对消、高速数字匹配滤波器、高速FFT滤波器和τ-fd两维一次判决技术，大大缩短了捕获高速目标的时间，提高了动态性能。侧重对高速数字匹配滤波器的设计、解决多普勒失谐的方案进行较详细的论述。