激光引爆碎石治疗仪

利用Nd：YAG和Nd：YVO4的脉冲激光引爆炸药头，粉碎胃结石使胃结石治疗仪体积大为减少。     

皮秒和纳秒YAG脉冲激光离体血管成形术的实验研究

采用皮秒和纳秒YAG激光脉冲分别对试管内血栓、猪主动脉血栓及猪动脉血管壁进行了详细的激光气化实验研究。给出样品气化深度与激光脉宽、波长、单次脉冲能量和辐射总能量的关系曲线,并对样品作了组织学检查。     

超声引导Nd:YAG激光对离体猪肝损伤的实验研究

激光损伤肝癌的基础与临床实验研究已有报道 ,激光功率及损伤时间各家报道有异〔1-4〕,为寻求激光对肝组织损伤的最佳功率及时间 ,笔者为此作了系列实验研究。1　材料与方法1 1　材料与设备①离体猪肝 12个 ,每个重 1 5～ 2 0千克。②ＪＤＸ - 80型Ｎｄ :ＹＡＧ激光多功能仪 ,激光波长 1 6 μｍ、输出功率 0～ 5 0瓦连续可调、国产光纤直径 40 0 μｍ。③超九 (ＨＤＩ)超声仪 ,10 - 5ＭＨｚ,配有录、照相系统。针具 :国产穿刺针。④测温仪 :国产热电偶测温仪 ,测温范围 0～ 10 0℃。1 2　方法1 2 1　离体猪肝组织激光损伤 (ｉｎｔｅｒｓｔ…     

超声导入Nd：YAG激光凝固离体肝癌组织的实验研究

目的：欲寻求激光凝固离体癌肿组织的最佳功率和最佳时间。方法：动物实验基础上，实时超声引导、观察组织间激光凝固（interstitial laser photocoagulation,ILP)离体肝癌标本。结果：激光能有效损伤离体癌肿组织造成凝固性坏死，效果肯定；功率为6瓦，时间为8至10分钟时癌肿组织凝固效果最佳，损伤范围直径2．8cm左右。结论：激光凝固离体癌肿组织效果肯定，最佳功率和最佳时间分别为6瓦及8瓦至10分钟。     

准分子激光血管成形术离体实验研究

用波长为308nm的准分子激光照射试管内及离体动脉内血栓和主动脉壁。在光斑大小及脉冲频率不变情况下,改变单脉冲能量及脉冲次数,后经肉眼观察和组织学检查评价结果。结果表明:①准分子激光能有效地消融血栓;总能量不变时,消融深度     

离体生物组织激光焊接特性实验研究

为了获得激光焊接工艺参数对离体生物组织融合效果的影响规律,设计实验探究了激光功率、激光扫描方式等参数对离体皮肤切口融合形貌及抗张强度的影响,并对工艺参数进行了优化。结果表明,采用小功率长时间工艺规范焊接离体皮肤组织,组织切口融合效果较好、抗张强度较高,并且可以减小不可逆的热损伤;采用分段扫描焊接方式,可以加强切口附近成分的活性,减小切口热损伤。在此基础上,采用优化的工艺参数进行可靠性实验,并对切口抗张强度进行了测试。结果表明,在该工艺条件下,组织切口可实现全层融合,并且无烧损、碳化等缺陷,与连续激光焊接工艺相比,焊接时间可减少30%~40%,焊后组织切口抗张强度可达0.38 MPa,满足强度要求。     

采用激光和光纤的引爆技术

日本鹿岛建设公司和日本油脂公司合作研制出利用激光和光纤的安全可靠的引爆技术，如图1所示。此设备装有YAG脉冲激光器，当高功率激光束（激光振 荡输出1.69 J/0.4 ms)通过光纤（纤芯材料为石英，芯径为0.8 mm)照射到光雷管上时，会使黄色炸药之类的产业用炸药起爆。它是与现在常用的电雷管不同的新的引爆法。     

YAG激光离体犬心内膜接触照射致心肌管道

采用YAG激光光纤自离体犬左室壁穿透进入左心腔内,与心内膜接触照射。共致不透性心肌管道314个(15只犬心)。每个心脏制作管道20±9个(12～35个),所用激光照射能量36±8Ws,心肌管道深度14±8.6mm,管道外孔直径1.1±0.3mm,     

灰铸铁YAG激光热处理的实验研究

本文采用５００Ｗ连续输出的ＹＡＧ数控激光热处理系统对ＨＴ２５０灰铸铁进行了激光热处理工艺参数－－－输出功率、热焦量、扫描速度、表面吸光膜层处理及表面粗糙度对感化层深度、宽度、硬度和显微组织影响的实验研究。为连续输出ＹＡＧ激光热处理的应用提供了有价值的参考数据，并在汽车缸体（套）淬火中试用。     

YAG激光光纤对犬声带及舌体的组织学效应观察

我们探索应用Nd~(3 ):YAG激光通过光学耦合系统,由单丝石英导光纤维传导,进行犬声带及舌体的实验,观察不同能量的激光对组织的即时变化及其愈合后的变化,以指导临床。方法     

TEA CO2激光去除光纤涂敷层的实验研究

采用波长为10.6μm的高能TEA CO2激光去除SMF28光纤涂敷层,研究了激光脉冲数和能量密度与涂敷层去除效果之间的关系.实验证明,涂敷层去除厚度随激光能量密度的增加成对数增长,且在某个范围内去除效果存在一个最佳值.     

Mechanisms of biliary stone fragmentation using the Ho:YAG laser

The authors have investigated the fragmentation of gallstones using the pulsed Ho:YAG laser, comparing it to lithotripsy using the visible pulsed-dye laser. They find that the physical mechanisms of stone fragmentation appear to be quite different in the two cases. Using high-speed photography, measurement of acoustic transients, time-resolved optical emission spectroscopy, and direct microscopic observation, the authors have analyzed the interaction of the Ho:YAG laser with both water and gallstones. They propose a new model in which fragmentation begins with absorption of the laser light by the stone surface. This is followed by melting and ejection of stone material, which is then swept away by the vapor bubble formed by the absorption of the Ho:YAG laser light by water. This model is in excellent agreement with the authors' experimental observations, and differs substantially from the model developed by P. Teng et al. (1987) for laser lithotripsy using the visible pulsed-dye laser     

基于增益开关激光器和HNLF的超连续谱产生实验研究

基于增益开关激光器和高非线性光纤(HNLF),对产生超连续(SC)谱的方案进行了实验研究。验证了采用不同输入功率以及不同非线性系数的光纤对SC光源输出频谱的影响。针对频谱编码光码多分址(OCDMA)系统应用,提出了衡量SC光源性能的平坦度指标定义,即为C波段内除种子尖峰外的最大功率与最小功率的差值。针对采用HNLF不易产生SC光源,提出采用具有幅度均衡功能的波长选择开关(WSS)对SC光源的平坦度指标进行优化,平坦度从9dB降至3dB。将上述SC光源应用于动态可重构频谱编码OCDMA系统中,实现了40km的传输实验,误码率(BER)优于10-9。     

Polarimetric optical fiber sensor using a frequency stabilizedsemiconductor laser

Improved performance of a polarimetric optical fiber sensor for remote temperature measurement by the use of a frequency-stabilized semiconductor laser is discussed. The temperature change is measured from the phase delay between two orthogonally polarized modes in a polarization-maintaining fiber. The sensor output signal is demodulated utilizing direct modulation of the laser frequency. The center frequency of the modulated laser is locked to a Fabry-Perot interferometer by controlling the injection current. The minimum detectable temperature is evaluated experimentally to be less than 0.005°C, which is several times smaller than that obtained with the free-running laser     

环行腔掺铒光纤激光器调谐实验研究

本文自行设计环行腔可调谐光纤激光器,研究环行腔掺饵光纤激光器的调谐技术,采用应力可调谐光栅进行实验,解决了光纤激光器普遍存在的泵浦光反射形成的回波影响问题和窄线宽激光输出功率与激光模式的矛盾,讨论了输出耦合比对调谐特性的影响,实现了窄带滤波和宽带调谐的双重特性,实现了窄线宽可调谐激光输出。     

Space optical communications with the Nd: YAG laser

The development of a Nd : YAG space laser communication system is discussed with respect to history, potential applications, and present status. The basic design of an Air Force Space Communications Flight Test operable at a data rate of 1000 Mbit/s is described at both the system and component level. An engineering feasibility model of this system has been completed, and the results of tests data are reported. Communications at 1000 Mbit/s with a receiver sensitivity of 20 photoelectrons/bit was demonstrated for a bit error rate of 10^-6, interterminal tracking with angle erros less than 1 µrad, and station to station acquisition in less than 6 s. A simulated range of 40 000 km was used.     

高功率光纤激光器中自相位调制的实验研究

利用主振荡功率放大(MOPA)结构高功率皮秒脉冲全光纤激光器,对高功率皮秒脉冲放大器中自相位调制(SPM)效应进行了实验研究。激光器种子源是自行搭建的半导体可饱和吸收镜(SESAM)被动锁模光纤激光器。为了抑制非线性效应,使用一个自制重频倍增器把种子脉冲的重频增加到328 MHz 后再放大。放大器部分采用三级放大结构,最终获得了中心波长为1 066.5 nm,3 dB 光谱线宽约为2.5 nm,平均功率为91W 的稳定皮秒脉冲激光输出。实验对光脉冲在放大的过程中自相位调制引起的光谱变化进行了研究。对激光器输出光谱的分析表明,随着功率的增大,高功率光纤激光器中自相位调制效应受到入射脉冲的初始啁啾和脉冲形状的影响程度也随着变大,与此同时还受到自陡峭效应的影响。     

High-repetition-rate optical pulse generation using a rationalharmonic mode-locked fiber laser

Rational harmonic mode locking takes place in an actively mode-locked fiber laser when the modulation frequency f_m=(n+1/p)f_c, where n and p are both integers and f_c is the inverse of the cavity round-trip time, the 22nd order of rational harmonic mode locking has been observed when f_m ≈1 GHz. An optical pulse train with a repetition rate of 40 GHz has been obtained using a modulation frequency f_m=10 GHz. The theory of rational harmonic mode locking has also been developed. The stability of the mode-locked pulses is improved considerably when a semiconductor optical amplifier is incorporated into the fiber laser cavity. The supermode noise in the RF spectrum of a mode-locked laser is removed for a certain range of current in the semiconductor optical amplifier     

半导体激光器线性调频光纤位移测量仪的研究

半导体激光器线性调频光纤位移测量仪是将半导体激光器线性调频技术与光纤传感技术相结合制成的一种新型外差干涉仪,它结构简单,实用性强,位移测量范围为1mm;精度优于0.05μm。     

光纤光栅激光传感器的研究现状及其应用

概述了光纤光栅激光传感器(FBGLS)的基本结构和特点,并着重介绍其波长型、偏振态型、相位型传感器的工作原理及发展现状,最后阐述了FBGLS的应用前景。