激光诱变选育果胶酶高产菌株

采用Ar⁺、He-Ne、LD、YAP等激光辐照果胶酶产生菌,不同波长激光辐照均获高酶活菌株,其中从LD激光与He-Ne激光辐照组中选育出酶活达6×10⁴单位/g的高产菌株(比对照组提高122%),并稳定地应用于生产.文中从黑曲霉抱子与DNA的吸收光谱以及电镜观察黑曲霉抱子的结果出发,对激光诱变机制进行了初步探讨.     

J95型He—Ne激光实验装置的研制和实验

一、研制J95型He－Ne激光实验装置的基本思想和装置的特点激光实验中以He－Ne激光实验最为直接，最为简单，最为明了，能直观地了解激光是如何产生的，以及影响激光输出功率的种种因素．但在以往的一些He－Ne激光实验装置中，全套均是玻璃结构，因而存在许多难以克服的缺点，给教学带来诸多不便．例如：1．全套实验装置都是玻璃结构，组装十分复杂，必须有相当技术的玻璃工才能完成，而且一旦装成便不易挪动．2．激光实验装置工作一段时间后，需更换高纯He和Ne气、电离管、热偶管等重要部件，高真空阀门也时有损坏，但在玻璃结构的装置…     

He-Ne激光在香菇速生高产菌株选育中的应用 Ⅱ酯酶同工酶分析及中试栽培

采用He－Ne激光诱变选育的6株香菇菌种酯酶同工酶与亲本相比，酶带条纹数、迁移率等特征发生了明显的改变，表明了在激光作用下，香菇菌丝体遗传物质发生了变异．所选育的香菇新菌种中试栽培结果表明：新菌种在生产条件下，生长周期平均缩短20天以上，香菇产量最低平均提高10％以上，最高可提高22.5％．     

利用等厚干涉测量He──Ne激光的波长

本文利用等厚干涉，通过已知波长的单色光与He──Ne激光的对比，测出He──Ne激光的波长。     

一种五波长半导体激光生物组织辐照仪

采用GaAlAs单量子阱半导体激光器和LD泵浦的Nd:YVO4－KTP倍频激光器等研制了国内首台可从光导纤维输出5种波长的半导体激光生物组织辐照仪,该仪器已在激光生物医学领域投入应用．     

简易线偏振激光光源

本文介绍了使He－Ne激光器（长250mm）输出的激光束通过偏振片之后光强波动减小的方法。     

氦氖激光在红霉素链霉菌和龟裂链霉菌灭活原生质体融合中的应用Ⅱ──融合子的分析鉴定

通过比较He－Ne激光和聚乙二醇（PEG）对红霉素链霉菌（s．erythreus简称SE）和龟裂链霉菌（S．rimosus简称SR）灭活原生质体的诱导融合，筛选得到几株红霉素产量与亲本相比有明显差异的融合子，通过对融合子酯酶同工酶谱、产抗能力及遗传稳定性分析，结果表明：融合子酯酶同工酶谱与亲本相比，酶带条纹数、迁移率等特征发生了显著的改变，表明其遗传物质发生了杂交重组，融合子产抗能力与亲本的相比，最多提高了28．04％，融合子具有良好的遗传稳定性．     

核泵浦气体激光研究

本文介绍了利用核能激励Ｎｅ、Ｈｅ、Ｘｅ、Ａｒ等气体产生激射这一领域内所取得的成果．利用￣（２３８）Ｐｕ源激励Ｎｅ、Ｈｅ－Ａｒ、Ｎｅ－Ｈｅ、Ｎｅ－Ｈ＿２体系,测到了Ｈｅ、Ｎｅ、Ａｒ、Ｈ＿２对Ｎｅ（２ｐ＿１）态的倒空速率常数．利用３００￣＃稳态堆激励Ｈｅ－Ｈｅ体系,测得其增益为２×１０￣（－２）／ｃｍ．在ＣＦＢＲ－Ⅱ脉冲堆上进行了Ｈｅ－Ａｒ－Ｘｅ体系的激射实验,测到了激光信号,其波长为１．７３μｍ,激光功率约为１０ｍＷ． The results of nuclear pumping Ne, He, Ar, Xe are introduced in this paper.￣(238)Pu was used to exite Ne, Ne-Ar, Ne-He, Ne-H_2 systems. The elimination rate constantsof Ne (2p_1 ) by Ne,He,H_2,Ar were measured. 300￣# stable reactor was used to encourage HeNe system, the gain measured was 2 ×10￣(-2)/cm. Lasing experiment of He-Ar-Xe system wasdone on CFBR-Ⅱ pulse reactor, lasing sign was measured, λ=1.73μp, lasing power wasabout 10 mW.     

用He-Ne激光声光器件进行声光幅度调制和声光偏转实验

描述了用He－Ne激光声的声光器件进行的声光调制和声光偏转实验。调制曲线上有一个拐点，在拐点附近的一段曲线可看成直线，利用这段曲线进行调制可减少失真。     

He-Ne激光器放电点火电压的实验研究

寻找能降低He—Ne激光器点火电压的外加催离剂．实验对He—Ne激光器的点火电压在阴、阳极被可见光照射、低放射源作用于放电管和阴极附近加强电场的条件下进行了测量．对不同外加条件作用下He—Ne激光器点火电压实验数据的误差进行了分析．实验结果指出，用可见光照射阴极或阳极不能降低He—Ne激光器的点火电压；能明显降低点火电压的因素可以是低放射源或外加强电场．     

半导体激光器在大学物理实验中的应用

比较了半导体激光器（LD）与He-Ne激光器的特点及区别,将半导体激光器应用于阿贝成像原理和空间滤波实验、迈克尔逊干涉仪的调整和使用实验中。通过对实验数据分析指出：半导体激光器可以替代He-Ne激光器在大学物理实验中使用。     

全内腔绿光He-Ne激光器

采用Needle法,对全内腔绿光He-Ne激光器膜系进行设计,并给出了所设计膜系的光谱性能。利用离子溅射镀膜技术镀制了所设计的膜片并且给出了测量结果。制备了多种规格的全内腔绿光He-Ne激光器并且讨论了相关工艺。其中腔长420mm的全内腔绿光He-Ne激光器的典型输出光功率为3mW（单模）,腔长360mm的典型输出光功率为2mW（单模）,腔长240mm的典型输出光功率为1mW（单模）,腔长100mm的小短管子也能有0．1mw的出光功率。     

Kinetics of laser active media for NeI 3p-3s transitions pumped by a weak source of external ionization

The possibility of creating direct nuclear-pumped lasers on Ne 3p-3s transitions has been investigated. Spectroscopic investigations of radiation from a nuclear-induced He-Ne plasma and calculations of the kinetics of various physical-chemical processes have been carried out.     

Laser diode pumped LNYAB self-frequency-doubling lasers

The LNYAB self-doubling laser pumped by (LD) has been developed for the first time. The properties of the lasers are much better than those of NYAB self-doubling lasers pumped by LD. The LNYAB self-doubling laser pumped by LD can be operated in TEM_(00) mode with threshold pumping power of 3.6mW which is lower than that of LD pumped NYAB self-doubling lasers by 74%. The output power is 29mW at 0.531μm in green region with optical-to-optical efficiency of 4.8% which is higher than that of NYAB self-doubling laser by 20%.     

Holograms produced with double-heterojunction laser illumination

Off-axis holograms have been constructed with a double-heterojunction (Ga, Al) As-GaAs semiconductor laser, and image reconstruction has been accomplished using a semiconductor and a He-Ne laser. The reconstructed real images were quite clear, and the signal-to-noise ratio of those images was about 10. Experiments suggest that semiconductor lasers can successfully be applied to coherent optics.     

Controlled synthesis of monodispersed superparamagnetic nickel ferrite nanoparticles

Nickel ferrite nanoparticles have been prepared through a gentle chemistry route, starting from iron nitrate, nickel nitrate and stearic acid. The nickel ferrite crystalline phase, the particle size and shape, and the homogeneity of the resulting nanoparticles were studied by X-ray diffraction and transmission electron microscopy. Fourier transform infrared techniques were used to study the composition characteristics of the as-prepared sample. Magnetization studies at room temperature showed superparamagnetic behavior for the nanoparticles. Magneto-optic rotation studies at different wavelengths of He-Ne lasers reveal non-linear behavior.     

LD泵浦Nd:YAG微片激光器

ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器结构简单紧凑，与半导体激光器相比，前者具有激光线宽窄、光束质量好、相干长度长等优点，因此在一些测量领域有着较好的应用前景。目前对ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器的实验工作主要是获得单频、单模连续输出和线性频率调制特性研究。本文综述了近几年来ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器的研究方向、成果及应用，主要介绍了各国对ＬＤ泵浦Ｎｄ：ＹＡＧ微片激光器的调频特性的研究状况     

Polarization properties of multimode internal mirror He-Ne lasers

The polarization behaviour of internal mirror multimode He-Ne lasers oscillating at 632.8 nm has been experimentally studied. It has been found that phase anisotropy of the cavity plays a dominant role in determining this behavior and fixing polarization configuration of the modes.     

Zeeman-birefringence He-Ne dual-frequency lasers based on hole-drilling birefringence in a cavity mirror

Previous dual-frequency lasers mainly made use of artificial birefringence for frequency splitting, which were of a limited-frequency difference stability and complex construction. In this paper, we invented a novel Zeeman-birefringence He-Ne dual-frequency laser without any artificial devices, but by hole drilling in the cavity mirror. The laser-frequency difference (LFD) ranging from kilohertz to tens of megahertz was realized and the relationship between the LFD and the hole geometric sizes was investigated. Theoretical analyses were carried out. Characteristics of the LFD were explored for both the indium-sealed and hard-sealed lasers with a frequency stabilization system. The results showed the LFD with hole-drilling, indium-sealed lasers is maintained at 30 kHz within 2 h, which is better than the hard-sealed ones with a stability of 200 kHz within 2 h. The hole-drilling Zeeman-birefringence He-Ne lasers may make significant progress for the light source of the interferometers and Doppler velocimeters.