共查询到20条相似文献,搜索用时 62 毫秒
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数字图像处理在激光全息中的应用 总被引:1,自引:1,他引:1
本文主要介绍了利用计算机生成的数字图像代替传统的三维立体模型作为全息拍摄对象的方法。从数字图像的全息记录原理出发,讨论了数字图像的分辨率及设计方法问题。 相似文献
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用氩离子激光治疗18例黄斑裂孔,除2例由于视网膜下积液较多效果不好外,其余16例都取得了良好的效果。氩离子激光光凝具有光斑小、损伤小、并发症少、操作易行、对患者痛苦少等优点。只要很好地控制激光能量,合理地应用激光照射点,以减 相似文献
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激光超声及其在无损检测中的应用 总被引:7,自引:0,他引:7
简要地介绍了目前常用的各种无损检测技术,对利用激光产生与接收超声波的原理进行了说明,着重讨论了激光超声的主要技术特点,包括其突出的优点及目前尚存在的一些问题,在此基础上,指出了这一技术几个十分重要的应用举例及今后的发展方向。 相似文献
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增益光栅作为一种动态衍射元件,可构成一种环形腔,只需一束光波即可形成光栅并产生位相共轭波,因此该现象被称为自泵位相共轭(SPPC),SPPC环形谐振腔具有修正位相失真的功能,由于其具有远大于1的反射率,用一个部分反射器取代输入光束,则系统就成为自启动的。在增益介质中写入体积增益光栅可用于高功率激光系统中光束质量的控制,本文综述了增益光栅的瞬态动力学特性和频谱滤波特性以及各种类型光栅在自启动全息激光振荡器中的贡献。 相似文献
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增益光栅作为一种动态衍射元件,可构成一种环形腔,只需一束光波即可形成光栅并产生位相共轭波,因此该现象被称为自泵位相共轭(SPPC)。SPPC环形谐振腔具有修正位相失真的功能。由于其具有远大于1的反射率,用一个部分反射器取代输入光束,则系统就成为自启动的。在增益介质中写入体积增益光栅可用于高功率激光系统中光束质量的控制。本文综述了增益光栅的瞬态动力学特性和频谱滤波特性以及各种类型光栅在自启动全息激光振荡器中的贡献。 相似文献
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Belyaiev V. Burmakin V. Evtyunin A. Korolyov F. Lebedeva V. Odintzov A. 《Quantum Electronics, IEEE Journal of》1969,5(12):589-591
Single-frequency oscillation has been obtained from an Ar laser of increased power level with the help of a three-mirror Smith reflector (power in the 4880-Å line was 2 watts). Equations and plots that permit the choice of optimum parameters of the three-mirror reflector are given. It is shown that for effective frequency selection in a high-power laser of great length it is necessary to use beam splitter reflectivities exceeding 0.5. Single-frequency lasers of this type may be used in holography. 相似文献
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激光全息技术的发展与应用 总被引:2,自引:0,他引:2
介绍了近年来国内外激光全息的新技术、新产品和新方法,分析了其中需解决的关键技术和发展趋势,以利于拓宽思路,不断进行技术创新,开创激光全息技术应用的新局面。 相似文献
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长春市第一光学仪器厂 《中国激光》1979,6(11):28-30
一、引言 有关连续染料激光器的专题文章,在国外已有很多报导。 由于连续染料激光器具有输出功率高(从几百毫瓦至几十瓦)、转换效率高(大于30%),可获得优于10~(-5)埃的窄线宽,光谱覆盖范围宽,而且能够连续调频、连续运转等特点,因此,当这一器件出现后很快就被用于高分辨激光光谱学和激光分离同位素等新兴的学科领域。在许多应用中最引人注目的例子是利用该器件首次成功地分离了铀、钙、氯以及多种稀土元素的同位素,并在无多普勒加 相似文献
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A simple CW ruby laser pumped by a 514.5-nm argon ion laser, utilizing an uncoated ruby rod (no external mirrors), is described. The output does not exhibit spiking, but does show a low amplitude ∼1 percent) of modulation. 相似文献
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The output spectra of an A+ laser in its λ 4879.90 Å transition has been observed at various levels above threshold, in a ring resonator, a two-mirror resonator of the same longitudinal mode spacing (107 Mc/s), and another two-mirror resonator of about three times that mode spacing. Oscillations were restricted to the fundamental (Gaussian) mode. The A+ laser spectra display three novel features, hitherto unobserved in the oscillation spectra of neutral-gas lasers [17], which appear to stem, at least in part, from its large natural line width: 1) At moderate levels above threshold, the spectra are extraordinarily stable, and usually characterized by gaps of many mode spacings between oscillations. 2) Above a critical level, oscillations occur in random sequence at all resonances, with violent amplitude fluctuations at each frequency. 3) The time-average envelope of the unstable "multimode" oscillations exhibits three well-defined maxima, which give way to a single maximum at a higher excitation level. The line shift of the laser transition has been measured to within about 10 percent, by comparing oscillation frequencies at the center of symmetrical spectra in the two counter-circulating waves of the ring laser. 相似文献
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The output power of pulsed noble gas ion lasers is discussed in terms of dependence on gain, plasma tube length, current density, and excitation mechanisms. Experimental data for some of the strong laser transitions of singly ionized argon in pulsed operation are presented. The resulting power output dependence on current density suggests that two-step excitation plays an important role, particularly in the population of the lower laser levels. This point of view is consistent with observation of ring formation in the output beam cross section, and of the output power dependence on thefrac{3}{2} power of the plasma tube diameter. 相似文献