EPON系统在单、多模光纤混合条件下的应用

从EPON系统的工作原理出发,讨论了单、多模光纤的传输性能差别和单、多模激光器的原理和区别,提出了ONU发光模块以单模激光器代替原有的多模激光器,以解决单、多模光纤混合条件下EPON系统的应用,且试验证明应用此方法的EPON传送情况良好。     

多段式半导体激光器的研究进展

综述了多段式半导体激光器的研究进展.按结构不同,将它们分为两段式、三段式和四段式激光器进行讨论.重点介绍了几类具有典型结构的单片式集成激光器,总结了它们的设计背景、设计目的、基本设计思想、性能特点和基本用途,讨论了这些器件结构的共同点,指出两段式、三段式和四段式激光器研究上的关联和各自的研究重点.分析了多段式半导体激光器的发展趋势,展望了它们的应用前景.     

晶体激光器

这是一篇晶体激光器概况的综述。对晶体基质进行了讨论,特别着眼于其适于作激光系统的一些特性。对作激光器的稀土和过渡金属激活剂列了表,并讨论了曾加激光器总体效率的敏化原理。叙述了连续工作激光器的基本特性。提示了一些可能的应用和今后的研究方向。     

DF/HF化学激光器喷管总压损失的数值模拟

DF/HF化学激光器需要体积庞大的压力恢复系统才能够工作。为了综合考虑激光器和压力恢复系统一体化设计,对DF/HF化学激光器的两种喷管的内流场采用了CFD技术进行了模拟,比较了它们的总压损失的差别和内流场的不同,并讨论了这种不同对整个激光器性能的影响。计算结果表明,细喉道的喷管不但有利于减小激光器增益发生器的尺寸,而且它的总压损失近似于标准喷管,从而不会增加激光器后部压力恢复系统的体积。     

1500W高频激励CO_2激光器的研究

讨论了高频放电激励ＣＯ２激光器的基本机理，报道了最新研制成功的高频激励横流ＣＯ２激光器的基本结构、技术特点和实验结果，该激光器低阶模输出为１．５ｋＷ，光束发散角小于２ｍｒａｄ。     

掺钛宝石可调谐激光器进展

本文评述钛宝石晶体和激光器的特性和进展。讨论若干基本技术问题,包括泵浦源和晶体元件的选择、激光器设计中的一些关键参数;涉及光纤耦合输出及由BBO作倍频。展望其未来发展。     

钛宝石晶体和各类可调谐钛宝石激光器的特性

本文综述可调谐激光晶体钛宝石的基本物理和光谱性质，品质鉴定和关键问题──残余红外吸收的研究结果；讨论激光器设计的若干关键因素；评述各种类型钛宝石激光器的性能和最新发展情况。     

面发光激光器在航空电子系统中的应用

垂直腔面发光激光器具有许多特点。这些特点是非常需要的，而且适合在光学互连、光学数据总线、光学和光学信号处理中应用。叙述了以GaAs为基础的垂直腔面发光激光器的基本器件结构和制造技术、讨论主要激光器性能特征、例如发射波长、光束图案、阈电流、输出功率、量子效率和调制响应。这些特征对激光器的潜在应用非常重要。还叙述了将激光器与n通道MESFET（金属—半导体场效应晶体管）驱动器单片集成化的最新成果。     

全国第5届激光基本问题讨论会在长春召开

中国光学学会于1987年7月26日至29日在长春召开第5届激光基本问题讨论会。各高等院校和研究所40多个单位约110人参加了这次讨论会。会议安排了激光不稳定性、激光混沌态、新型激光器、色心激光器和固体激光器进展等方面的综述评论性专题报告,然后就有关问题分组发言和讨论。向会议提交的中心发言稿约有80余篇。     

远红外激光器目前与将来的问题

讨论了缚红外分子激光器目前与将来的基本问题。感兴趣的课题是激励方法、分子物理学、能量交换与弛豫过程、共振腔设计、激光器模型和分析。最近七年来在远红外分子激光器轿究方面取得很大进展，但目前的研究还主要处于探索阶段，对此领域的透彻了解与有关的研制还是将来的事。     

Theoretic research on mutual injection phase-locking of four fiber lasers

The theory of mutual injection phase-locking applied in two or three fiber lasers is extended in this paper.Four fiber lasers injected mutually by any two lasers are firstly modeled.And the four fiber lasers with the same frequency and coupling coefficient are numerically simulated.Simulation results show that with changing the initial phase difference between lasers,coupling coefficient and the initial amplitude,the locking phase difference between lasers would not maintain the same value.Therefore,an arra...     

新型应力双折射双频激光器

本文报导了用频率分型技术实现的全内腔和半内腔应力双折射双频激光器,这两种激光器输出的频差可通过调节加在激光器应力双折射元上的压力调节,调节范围可从几十MHz到几百MHz。激光器经预热后,两种激光器输出频差的相对变化分别为10^-3和10^-5。     

Pure effects of strain in strained-layer multiple-quantum-welllasers

The pure effects of strain in strained-layer InGaAs-InGaAsP multiple-quantum-well (MQW) Fabry-Perot (FP) lasers operating in the 1.5 μm region are measured separately from the quantum effects by using lasers whose active layer wells have the same thickness but different amounts of strain. The gain peak wavelengths of transverse electric (TE) and transverse magnetic (TM) modes and the difference between TE- and TM-mode gain peak wavelengths increase when compressive strain is introduced. The differential gain coefficient and the gain saturation coefficient of the lasers are determined by measuring relative intensity noise (RIN) spectra and are found to increase with increasing compressive strain. The K factors of the lasers are determined from the relationship between the damping constant and the resonant frequency square     

两台多模激光场强度和相位的混沌同步

对空间耦合的两台多模激光场的强度和相位的动力学行为进行了理论分析.当系统的损失受到调制时,在一定的参数范围内,两台激光输出的总强度之间会出现很好的混沌同步,两台激光的对应模式之间也出现相应的混沌同步,但不同模式之间则是完全的混沌状态,每台激光的各个模式强度之间存在模式竞争现象.每台激光场不同模式的相位和相位差之间出现有趣的关系,与强度的混沌同步存在一定的联系.     

用于冷原子干涉仪的拉曼激光的注入锁定

原子干涉仪通常采取拉曼脉冲序列对原子波包进行相干操作,高功率的拉曼光可让更多的原子参与速度敏感型受激拉曼跃迁,有利于实现信噪比高的原子干涉仪条纹。研制高功率的拉曼激光器对冷原子干涉仪的实验研究具有重要意义,文章报道了基于注入锁定技术实现的高功率拉曼激光器的实验结果。主激光器经过1.5 GHz声光调制器产生1级衍射光作为拉曼光的种子光,注入到两个从激光器后锁定,并实现功率放大。两个拉曼光的频率相差3.0 GHz,频率调谐范围为200 MHz。     

Broadband tuning (170 nm) of InGaAs quantum well lasers

The wavelength tuning properties of strained InGaAs quantum well lasers using an external grating for feedback is reported. Tunable laser oscillation has been observed over a range of 170 nm, between 840 and 1010 nm, under pulsed current excitation. The optimal conditions for broadband tunability for the InGaAs lasers are different from GaAs lasers, which is attributed to a difference in spectral gain curves. Together with an optimised GaAs quantum well laser the entire region between 740 and 1010 nm is spanned.<>     

多激光制导目标时激光角度欺骗干扰问题研究

针对多机编队空对地激光制导精确打击时激光角度欺骗干扰问题,对多目标时指示激光信号的方位和编码特征进行了理论研究。结果表明:当指示激光信号时间差小于任一信号的重复周期且信号的重复周期为整数倍关系,或者指示激光信号时间差大于激光欺骗干扰设备解码时间时,激光欺骗干扰设备可以对组合信号进行解码,并分析了相应干扰方法。上述两种情况之外则会组合为伪随机序列码信号,激光欺骗干扰设备不能正确解码及实施干扰。     

Natural linewidth of semiconductor lasers

A formula is given for the natural linewidth of high-gain lasers, which is applicable to arbitrary three-dimensional geometries. This formula agrees with Petermann's result for lasers with transversely inhomogeneous gains (K-factor) and with previous results for the effect of small mirror reflectivities. It does not agree with the Schawlow-Townes (ST) formula used by most authors in evaluating the ?=?nr/?ni factor of conventional semiconductor lasers. The difference between the two formulas is significant when the mirror power reflectivity is less than about 0.6. Furthermore, the modified formula gives directly the linewidth of lasers coupled to long external cavities. Saturation effects, however, are neglected in this letter.     

Mapping the injection-lock band of semiconductor lasers

Detailed measurements of the lock band for injection-locked semiconductor lasers are discussed. The results are presented as fringe visibility versus frequency difference versus coupling. Fringe visibility is obtained by interfacing equal-intensity portions of the radiation from the master and slave lasers. A theoretical model that correlates well with the data is presented. Both theory and experiment amply demonstrate the influence of antiguiding on the structure of the injection-lock band     

Mutual Injection Locking of Two Individual$hbox Nd:hbox YVO_4$Lasers

We studied mutual injection locking of two individual continuous-wave$hbox Nd:hbox YVO_4$lasers that were coupled through an external section. The two lasers lased at the same wavelength with a stable output power and interference fringes with high contrast ratio in the combined beam profile showed good mutual coherence of the two lasers. Mutual injection locking was also achieved without active stabilization for individual lasers with a large cavity length difference and low$Q$-factors. The calculated combined output power under symmetric pumping agreed with the experimental results. Even when output couplings of individual lasers are not optimized, the output coupling of the combining section can be optimized to make the extracted power very close to the sum of maximum powers that can be extracted from individual free running lasers under optimal output coupling.