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提出了一种利用激光干涉仪测量光波波长的方法。通过改变在光的传播路径上垂直放置的透明玻璃与光传播方向的角度,使相干光的光程差发生变化;利用干涉条纹与转过角度、透明玻璃厚度之间的关系,通过激光干涉实验能准确测量出光波的波长。 相似文献
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In recent years, the high density plasma in the range of 10^19~ 10^20m^-3 have been operated in large or middle tokamak device in the world. A muhichannel far infrared interferometer for profile measurement of plasma density on HL-2A divertor tokamak is being developed, however the design of the interferometer will appear many new problem in face of experimental environment of the HL-2A divertor device, such as how to make both transmission and arrangement of optics of the interferometer, the effect of electromo- tive force on device and how about the vibration etc. According to the eight windows setting on the largest flange of the device we have to design a Michelson-type FIR laser interferometer with 8 probing channels and eight concave mirrors must be attached it to the inner wall of the vacuum vessel of the device. Therefore, there are many problems should be taken into account to resolve, for example, ( 1 ) the vibration-proof consider for muhichannel interferometer and HCN laser, (2) the stabilization and reliability of the mirror frame uum vessel, the mirrors, hanging on internal wall of vachow to prevent the sputtering to (3) the vacuum seal of the windows and the design of mobile seal for the shutter to avoid the sputter coating of plasma, 相似文献
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By using coupled differential interferometry a new laser displacement measurement interferometer with nanometric accuracy has been developed. The resolution and the stability of the interferometer are improved by multiplicating the optical path difference (OPD). The new interferometer is simple in concept,symmetric in optical paths,without optical deadpath,easy to set up and align. λ/1600 resolution and nanometric accuracy are achieved within the measurement range of 10 mm. 相似文献
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1lntfortionLaserinterferometersarewidelyadoPtedinthefieldsoflengthmeasurementandtheyaredevtheingveryqulcklyintheseyears.RecentdevefoPment0fnanornetr0lDyhasputincreaseddemandsonthepedrianceofthelaserinterferomters,suchasstability,reS0utionandmeasuretnentaccuray.Bothdomesticandinternatdriallaserinterferometerswithhighaccuracy,esPeciaIlywithnanOInetricaccuracy,arelindtedtobewidelyaPpliedandcomrnerciahaedondifferentdegreebecauseofthesarneproblemi.e.thehighrequlrementformeasurementconditbo.Thea… 相似文献
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An active phase-shifting interferometer using current modulation of a laser diode is proposed. Fringe movement in the instrument is detected by a spatial filtering detector whose output is fed back to the injection current of the laser diode to lock the fringes and shift them correctly for phase shifting analysis. Frequency modulation characteristics of the laser diode and frequency response of the feedback system are first investigated. We constructed a portable interferometer head set apart from a mirror under test then measured the shape of a spherical mirror 130 mm in diameter, which was placed on a wooden table subject to vibration. Measurement repeatability of λ/35 was achieved. 相似文献
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报道了单模、单频连续1.3188μmNd:YAG激光器的研制,测量了激光输出的方向性,稳定性,激光光谱及输出功率,对实验结果进行了理论分析。 相似文献
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激光信号处理电路是傅里叶变换干涉仪的重要组成部分,为提高干涉仪控制器的控制精度,在分析干涉仪工作特点的基础上设计了激光信号处理电路,并着重分析了四阶Besell带通滤波器的误差传递路径,及各噪声对信号质量的影响,从而为低噪声电路设计提供一定的理论基础,具有参考作用.最后,半实物仿真结果表明所设计的激光信号处理电路精度达到0.01%,从而验证了所设计电路的合理性. 相似文献
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叙述了测量微观不平度的90°相移激光干涉仪的原理和构成。对这种新型干涉仪的性能及有关问题作了讨论。测量结果的计算和样品扫描的控制,由个人计算机完成。垂直分辨率达1um,横向分辨率达10μm。实验结果证明了系统的稳定性。 相似文献
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KDP晶体台阶生长动力学的激光干涉实验研究 总被引:5,自引:0,他引:5
采用迈克尔逊干涉技术 ,通过测量KDP晶体生长的法向速率和台阶斜率来研究其台阶生长的动力学系数、台阶自由能、溶质在边界层内的扩散特征以及激发晶体生长台阶的位错活性 .实验表明 ,KDP中不同活性位错的台阶动力学系数差异较大 ,例如高活性和低活性台阶动力学系数分别为 10 .3× 10 -2 和 5 .2 1× 10 -2 cm/s,位错源在晶体表面的形状、面积的变化 ,以及Burgers矢量的变化是造成晶体生长动力学测量数据重复性差的主要原因 相似文献
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The theory of ultrafast nonlinear interferometer which is a single-arm interferometer based on a semiconductor laser amplifier is described in Jones matrix. The device is suitable to be a demultiplexer in future optical time-division-multiplexing systems, which utilizes the phase shift induced by the refractive index nonlinearities of SLA. 相似文献
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Ryohei Hanayama Kenichi Hibino Shin’ichi Warisawa Mamoru Mitsuishi 《Optical Review》2004,11(5):337-343
Wavelength scanned interferometry allows the simultaneous measurement of top surface shape and optical thickness variation of a transparent object consisting of several parallel surfaces. Interference signals from these surfaces can be separated in frequency space, and their phases are detected by discrete Fourier analysis. However, these signal frequencies are shifted from the detection frequency by the refractive index dispersion of the object and a nonlinearity of the wavelength scanning. The Fourier analysis is sensitive to the detuning of the signal frequency and suffers from the multiple-beam interference noise. Conventional error-compensating algorithms cannot be applied to an object consisting of more than three reflecting surfaces. We derive a new 2N-1 sample error-compensating algorithm, which allows the phase detection of any order of harmonic frequency among the interference signals. The new algorithm suppresses the effect of signal frequency detuning as well as the multiple-beam interference noise and can be applied to the measurement of complex objects consisting of more than three reflecting surfaces. 相似文献
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We propose a photothermal phase-modulating laser diode interferometer equipped with a high-speed feedback control system. The CCD camera’s shutter-function raises the modulating frequency, which in turn elicits a higher feedback response, thus enabling us to eliminate nearly all external disturbance. With the recent application of a system purpose-built for discriminating between numerous fringe sequences, we have also reduced processing time. 相似文献
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基于马赫-泽德干涉具的激光光谱探测技术研究 总被引:1,自引:0,他引:1
实时、可靠地探测敌方来袭激光的类型和特征参数是激光告警的主要任务。相干探测技术依靠激光的相干性探测其信息,是较有效的探测技术之一。为了探测来袭激光光谱信息,设计了一种激光探测与光谱实时测量装置。该装置以相干探测技术和傅里叶光学与光信号处理为基础,使用实心小型静态马赫-泽德干涉具作为相干探测元件,它能有效地抑制背景光,无机械扫描部件,光谱检测速度快,可探测纳秒级窄脉冲激光信号;用高速DSP芯片和多通道帧减技术进行实时信息处理,实现背景噪声去除、激光探测和光谱测量。测试结果表明,运用马赫-泽德干涉具和多通道帧减技术,能实现脉冲激光探测,提高测量精度;可探测激光脉冲宽度为10 ns,波长测量误差小于10 nm。 相似文献