光参量振荡器实现相干反斯托克斯光谱测温的研究

本文叙述了在宽带单脉冲ＣＡＲＳ测温技术中，利用参量振荡器（ＯＰＯ）代替常用的染料激光器做为斯托克斯光的可行性。理论上分析了ＣＡＲＳ的测温方法，并且实验上证明了采用ＯＰＯ作为宽带单脉冲ＣＡＲＳ测温中的斯托克斯光源是可行的。     

光参量振荡器在CARS测温技术中的应用

通过理论分析和实验结果，叙述了在宽带单脉冲相干反斯托克斯拉曼散射（ＣＡＲＳ）光谱测温技术中，利用光参量振荡器（ＯＰＯ）代替常用的染料激光器作为斯托克斯光源的可行性问题。理论分析指出，测温范围在２２００Ｋ以内，用ＯＰＯ作斯托克斯光源是可行的，并利用该实验装置实测酒精灯火焰中的温度分布，其结果与辐射温度计测量结果比较，误差在５％以内。     

OPO—CARS测温技术的理论分析与实验研究

本文通过理论分析和实验结果，叙述了在宽带单脉冲反斯托克斯喇曼散射光谱（ＣＡＲＳ）法温技术中，利用光参量振荡器（ＯＰＯ）代替以往常用的染料激光器作为斯托斯光源的可行性问题。理论分析指出，测温范围在２２００Ｋ以内，采用ＯＰＯ作为斯托克斯光源是可行的，并利用该实验装置实测酒精灯火焰中的温度分布，其结果与辐射温度计测量结果比较的误差为４％以内。     

光传送网的一体化网管研究

光传送网技术可望成为下一代的主导传送网技术。详细讨论了光传送网（ＯＴＮ）和光传送网的管理技术。结合ＴＭＮ、ＳＮＭＰ和ＣＯＲＢＡ，着重研究了ＯＴＮ的一体化网管。一种Ｑ－Ａｄａｐｔｅｒ被提出来用于集成ＴＭＮ和ＳＮＭＰ，一种直接的ＣＯＲＢＡ／ＳＮＭＰ接口被用来实现ＣＯＲＢＡ和ＳＮＭＰ的集成。最后简要分析了几个和ＯＴＮ一体化网管相关的问题：ＩＰ层和光层的联合路由，多层保护以及ＯＴＮ的ＯＡＭ技术。     

OSCAGO—CFAR检测器在干扰边缘中的性能分析

本文研究ＯＳＣＡＧＯ－ＣＦＡＲ检测器在干扰边缘中的性能，文中推导出了它在干扰边缘环境中虚警概率的解析表达式，分析了它抗边缘干扰的性能，并且与ＧＯ、ＯＳ和ＣＡ－ＣＦＡＲ检测器进行了比较。结果表明，ＯＳＣＡＧＯ的抗边缘干扰性能比这三种ＣＦＡＲ检测器均有明显增强，同时，它在均匀背景和多目标环境中也保持了良好的检测性能。     

COMPACT STAR信函分拣机及SATRUN网络邮件处理系统

ＣＯＭＰＡＣＴＳＴＡＲ信函分拣机及ＳＡＴＲＵＮ网络邮件处理系统卡特一、ＣＯＭＰＡＣＴＳＴＡＲ信函分拣机ＣＯＭＰＡＣＴＳＴＡＲ分拣机采用标准组件的模块化概念，光纤传输及先进的信函跟踪与控制技术，分拣速度达每小时３．８万封信件。产品质量符合ＩＳＯ９００１...     

如何提高呼叫建立成功率

呼叫建立成功率是衡量一个网络质量的重要指标之一,所以想办法提高网络的呼叫建立成功率是非常重要的。 下面详细说明根据呼叫建立成功率计算公式分析可能原因,最后定位到哪套ＲＦ硬件问题。 一、呼叫建立成功率计算公式 Ｃａｌｌ_Ｓｅｔｕｐ_Ｓｕｃｃｅｓｓ_Ｒａｔｅ＝（ＴＯＴＡＬ_ＣＡＬＬＳ＋ＣＯＮＧＥＳＴ_ＡＳＳＩＧＮ　ＨＯ　ＳＵＣ）／（ＯＫ_ＡＣＣ_ＰＲＯＣ：ＣＭ_ＳＥＲＶ_ＲＥＱ_ＣＡＬＬ＋ＯＫ_ＡＣＣ_ＰＲＯＣ：ＣＭ_ ＲＥＥＳＴＡＢＬＩＳＨ＋ＯＫ_ＡＣＣ_ ＰＲＯＣ：ＰＡＧＥ_ ＲＥ-ＳＰＯＮＳＥ＋ＯＫ_ＡＣＣ_ＰＲＯＣ…     

CMOS SRAM存储单元研究

阐述了采用１．０μｍ ＣＭＯＳ技术制作的２５６ｋ ＳＲＡＭ的存储单元。论述了存储单元的性能在ＣＭＯＳ ＳＲＡＭ中的重要性，分析了存储单元的工作原理，结构和主要参数性能。文章对几种类别的ＣＯＭＳ ＳＲＡＭ存储单元进行了分析比较，推测了技术发展趋势。     

宁波GSM系统LAC调整方案

宁波ＧＳＭ系统ＬＡＣ状况 目前宁波ＧＳＭ系统共有ＬＡＣ区２２个,每个ＢＳＣ分配一个ＬＡＣ（除市区ＢＳＣ２３,ＢＳＣ２４外）,这样,某些ＢＳＣ的Ｌｏｃａｔｉｏｎ－Ｕｐｄａｔｅ占ＯＫ－ＡＣＣ－ＰＲＯＣ的比例（后称ＬＵ－ＲＡＴＥ）相当高,如余姚ＢＳＣ８,其ＬＵ－ＲＡＴＥ高达７９．４２％,其ＳＤＣＣＨ负荷相当重,且已导致ＳＤＣＣＨ拥塞,具体每个ＢＳＣ的ＬＵ次数,ＬＵ－ＲＡＴＥＰＡＧＥ－ＲＥＱＵＥＳＴＳ／ＰＡＧＥ－ＲＥＳＰＯＮＳＥ,ＰＡＧＥＳ－ＰＥＲ－ＳＥＣＯＮＤ,ＳＤ－ＣＯＮＧＥＳＴＩＯＮ－ＲＡＴＥ,…     

MSCDEX的使用

ＭＳＣＤＥＸ的使用邵振付计算机对ＣＤ－ＲＯＭ驱动器的识别与操作同ＣＤ－ＲＯＭ驱动器的配置有关，这就是ＭＳＣＤＥＸ和ＣＤ－ＲＯＭ驱动程序的共同任务，下面作一简单介绍。ＭＳＣＤＥＸ命令提供ＣＤ－ＲＯＭ驱动器的配置、安装功能，可通过ＡＵＴＯＥＸＥＣ．ＢＡＴ...     

中红外光参变振荡非线性晶体及器件研究进展

评述了近年中红外光参变振荡器(OPO)的研究进展,主要包括OPO非线性晶体的特性及OPO技术参量与器件系统,给出中红外OPO目前存在的关键问题和今后的发展方向,提出了进一步改善器件性能的可能途径。     

Multimode pumping of optical parametric oscillators

Calculations suggest that optical parametric oscillators (OPO's) can be efficiently pumped using multimode, divergent pump sources. The influence of pump beam divergence and mode structure upon OPO performance is measured for both noncritical phase-matching, and OPO's with walkoff. Multimode OPO pumping is shown to be efficient, provided appropriate nonlinear crystals and OPO cavities are employed; the nonlinear crystal must have sufficient angular acceptance to tolerate a divergent pump; the OPO cavity must support modes that match the divergence and spatial intensity characteristics of the pump, For low-order pump modes, the OPO can be made to match the mode of the pump. Higher order pump modes reduce the OPO efficiency, and cause a saturation of efficiency with increasing pump power. The efficiency is degraded in a similar fashion in the presence of walkoff. Multimode pumping is more difficult in longer OPO cavities due to increased buildup time of higher order OPO modes     

中红外高能量输出复合腔抽运光参量振荡器

报道了采用复合腔技术研究Nd:YAG激光抽运LiNbO₃晶体光参量振荡器(OPO)的实验研究结果。得到OPO输出单脉冲平均能量56.4mJ,闲频光(3097nm)脉冲平均能量22.8mJ,脉宽8ns,抽运光转换成参量光输出效率46%(重频1Hz～10Hz)。测得角度调谐的波长范围是:信频光1479nm～1621nm,闲频光3097nm～3793nm。     

固体Raman激光器与OPO激光器比较

综述了近5年来固体Raman激光器和光参量振荡(OPO)激光器的发展情况,并对Raman激光器和OPO激光器在工作原理、晶体材料方面进行了比较。Raman激光器在光束质量、光路稳定方面存在优势,而OPO激光器调谐范围大,输出功率高。最后对固体Raman激光器和OPO激光器发展前景进行了简要介绍。     

掺镁铌酸锂微结构多周期调谐光学参量振荡器

从傅里叶展开三波耦合波方程出发,对准相位匹配光学参量振荡进行了初步的理论分析,同时对准相位匹配周期极化掺镁铌酸锂微结构光学参量振荡进行了实验研究。通过改变微结构周期,实现了信号光从1.45~1.72 μm的输出,最小阈值为30 μJ。在温度30 ℃,抽运功率为300 mW,最大信号光输出功率为56 mW,斜率效率达18.7%。由于掺镁铌酸锂微结构抗光损伤性能显著提高,无需在高温下进行运转,使得掺镁铌酸锂微结构光学参量振荡器在常温条件下实现连续运转成为可能。与同成份铌酸锂微结构参量振荡器相比,结构更加紧凑,易于实现小型化。     

A simultaneously phase-matched tandem optical parametric oscillator

We report the theoretical analysis of a simultaneously phase-matched tandem optical parametric oscillator (STOPO) in which the principal OPO generates a signal which pumps a secondary OPO. Both OPO interactions are assumed to be phase-matched in a single crystal. The cavity has high Q for the signal produced by the principal OPO and has lower Q for the signal of the secondary OPO. The pump and the two idler frequencies are not resonated. The five waves undergoing nonlinear mixing are assumed to be nondegenerate in either frequency or polarization. We show that the useful output, consisting of the two idlers and the signal of the secondary OPO, can be produced with high efficiency over a large dynamic range in the pump intensity. We discuss the tuning with temperature and grating period of a STOPO based on periodically poled LiNbO₃ pumped at 1.064 μm. We present results based on both plane-wave modeling and modeling in three spatial dimensions     

发展中的光参量振荡器技术

本文介绍了光参量振荡器的发展历史，详细的论述了各种光参量顺最新进展状况，并分析了其可能的发展趋势。     

Optical parameter oscillation with detuned intracavitysum-frequency generation

The authors consider frequency up-conversion by means of an optical parametric oscillator (OPO), in which sum-frequency generation (SFG) takes place in a crystal preceding the OPO crystal in the resonator. The SFG crystal produces light with a frequency at the sum of the pump and OPO signal frequencies. Only the OPO signal is resonated. A small detuning (phase mismatch) of the SFG crystal yields stable steady-state operation with quantum efficiency greater than 40% for a factor of 34 variation in the pump intensity. Detuning also reduces the power loading on the OPO crystal. As an example, conversion of 1.064 μm radiation to 589 nm radiation is discussed. For this example, power conversion efficiency exceeding 85% is possible     

飞秒光参量振荡器的光谱净化和稳定性提升（特邀）

文中首次提出并验证了基于腔内色散管理实现飞秒光参量振荡器（OPO）光谱净化和稳定性提升的方法。对于高功率飞秒OPO,输出脉冲通常具有随时间无序变化的宽带不规则光谱,输出功率波动较大。利用铌酸锂（LiNbO₃）晶体在腔内引入额外的负色散,通过泵浦脉冲的时间滤波效应实现了干净平滑的窄光谱近转换极限的飞秒脉冲输出,光谱稳定性和功率稳定性得到了极大改善。该方法是一种实现飞秒OPO光谱净化和稳定性提升的灵活简便的方法,对于发展高功率的超短脉冲OPO具有重要的应用价值。     

The tandem optical parametric oscillator

We report the theoretical analysis of a tandem optical parametric oscillator (TOPO) in which the principal OPO generates a signal which pumps a secondary OPO. The signal produced by the principal OPO is resonated in a high-Q cavity containing both nonlinear crystals. This cavity also has low Q for the signal of the secondary OPO. The two OPO's are singly resonant, since neither idler is resonated. We show that the useful output, consisting of the two idlers and the signal of the secondary OPO, can be produced with high efficiency over a large dynamic range in the pump intensity. As an example, we discuss modeling in three space dimensions of a Nd:YAG-pumped monolithic TOPO based on periodically poled LiNbO₃. This TOPO could generate three infrared wavelengths in high-transmission bands of atmospheric water vapor