共查询到20条相似文献,搜索用时 109 毫秒
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分析了光电装备的种类及其弱点,研究了激光对红外光学材料、光学系统、笔种光电传感器的损伤过程与机理,探讨了光电探测器的非线性效应和抗激光加固技术。 相似文献
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HfO2/SiO2光学薄膜激光损伤阈值的测量 总被引:4,自引:0,他引:4
参照国际标准ISO11254及其规范,组建了小口径1064nm激光的损伤阈值测量装置,能对各种光学元件,包括高反膜、偏振膜及增透膜等进行了1064nm激光损伤阈值测量,按损伤阈值测量国际标准的要求,测量了由HfO2/SiO2镀制的1064nm高反膜,偏振膜及增透膜的激光损伤阈值,分析了它们的激光损伤特性,对于10ns的1064nm激光脉冲,高反膜的损伤阈值为12.8J/cm^2,偏振膜为9.8J/cm^2,增透膜为9.2J/cm^2,对于20ns,1ns的激光脉冲,高反膜的损伤阈值分别为15.3J/cm^2和5.75J/cm^2,高反膜的损伤阈值对于ns激光脉冲符合时间定标率τ^0.35。 相似文献
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电荷耦合器件抗γ总剂量辐射加固 总被引:1,自引:0,他引:1
文章从电荷耦合器件的基本工作原理出发,探讨了CCD地γ电离辐射效应,着重分析了表面损伤效应及其对CCD各结构的影响,提出了CCD抗γ总剂量辐射加固的结构设计途径及加固工艺。 相似文献
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为了研究连续激光晶化非晶硅薄膜中激光功率密度对晶化效果的影响,利用磁控溅射法制备非晶硅薄膜,采用连续氩氪混合离子激光器对薄膜进行退火晶化,用显微喇曼光谱测试技术和场发射扫描电子显微镜研究了薄膜在5ms固定时间下不同激光功率密度对晶化效果的影响,并对比了普通玻璃片和石英玻璃两种衬底上薄膜晶化过程的差异。结果表明,在一定激光功率密度范围内(0kW/cm2~27.1kW/cm2),当激光功率密度大于15.1kW/cm2时,普通玻璃衬底沉积的非晶硅薄膜开始实现晶化;随着激光功率密度的增大,晶化效果先逐渐变好,之后变差;激光功率密度增大到24.9kW/cm2时,薄膜表面呈现大面积散落的苹果状多晶硅颗粒,晶粒截面尺寸高达478nm ;激光功率密度存在一个中间值,使得晶化效果达到最佳;石英衬底上沉积的非晶硅薄膜则呈现与前者不同的结晶生长过程,当激光功率密度为19.7kW/cm2时,薄膜表面呈现大晶粒尺寸的球形多晶硅颗粒,并且晶粒尺寸随着激光功率密度的增大而增大,在 27.1kW/cm2处晶粒尺寸达到最大5.38m。研究结果对用连续激光晶化法制备多晶硅薄膜的研究具有积极意义。 相似文献
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本文通过对皮肤良性肿瘤、病毒性皮肤病、色素障碍性皮肤病患者320人供503例皮损数的CO2激光治疗,从美容的角度探讨了治疗效果及技术要点。320个患者通过CO2激光治疗皮损痊愈489例,显效12,有效2例;无效无例数,8例出现萎缩性疤痕,1例出现增生性疤痕。从而说明了只有掌握适用症及操作的技术要点,CO2激光是一种良好的皮肤病美容治疗手段。 相似文献
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Yoshino T. Kawata M. Bou Qimude Hayashi M. Takahashi Y. 《Lightwave Technology, Journal of》1998,16(3):453-458
The Nd3+:YAG microchip laser is operated at orthogonal-linear-polarized two frequencies (λ=1.06 μm). A low crosstalk of 10-4 is accomplished by means of the fiber-coupled laser diode pumping. The effect of another fiber-coupled laser diode irradiation on the beat frequency is investigated in terms of photothermally induced stress. The beat frequency of typically 100 MHz is stabilized within ±1 MHz by means of the photothermal feedback control of the cavity stress. The utility of the laser in heterodyne interferometric displacement measurement with a good linearity and high resolution is demonstrated 相似文献
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Kelly M.A. McIver J.K. Shea R.F. Hager G.D. 《Quantum Electronics, IEEE Journal of》1991,27(2):263-273
A continuously operating, C3F7I photolytic 1.315-μm atomic iodine laser has been used to make the first precise observations of frequency tuning of an atomic iodine laser by means of the Zeeman effect. Application of a uniform magnetic field to the gain region of the photolytic iodine laser causes the laser to operate at different frequencies as a function of the strength of the applied field and the polarization of the laser. With the light polarized perpendicular to the applied magnetic field by means of Brewster output windows, the laser could be tuned to frequencies near the 3-4, 2-2, and 3-3 zero-field transitions of the hyperfine spectrum of atomic iodine. With the light polarized parallel to the applied magnetic field the laser could be tuned to two frequencies bracketing the 3-4 zero-field transition and one frequency near the 2-2 transition. Measurements show close agreement between the observed frequency behavior and theoretical models 相似文献
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为了精确测量激光晶体的动态热焦距,提出了一种指示光偏振变换测量方法。基于几何光学成像理论,建立了热透镜动态热焦距的表达式。将准直的指示光往返两次通过具有热透镜效应的激光晶体,利用偏振变换的方法使测量光束有效的从光路中分离出来,采用CCD相机对被测光束进行探测。搭建了激光晶体的动态热焦距的实验测量装置,分别测量了端面泵浦和侧面泵浦两种工作状态激光晶体的动态热焦距,最后分析了实验测量的误差。结果表明:利用指示光偏振变换法测量激光晶体的热焦距,测量误差仅为0.8 mm,能够满足激光器谐振腔设计要求。 相似文献
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Experimental study of a pulsed, electric-discharge-initiated, SF 6+H2 pumped HF chemical laser is presented. The reactants were premixed and the laser medium was preionized by means of a plasma cathode. The laser pulse energy, as a function of the discharge voltage, was measured for various laser medium parameters. It was concluded that the ratio between the width and height of the active volume is an important issue in the laser performance 相似文献