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Experimental system for visualizing and measuring fields of density change with holographic interferometry using BSO single-crystal

使用 BSO 单晶通过全息干涉测量密度变化场的可视化和测量实验系统

基本信息

批准号：
03650164
负责人：
HISADA Shigeyoshi
金额：
$ 1.34万
依托单位：
KANSAI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Experimental system for visualizing and measuring fields of density change with holographic interferometry using BSO single-crystal is investigated. In this case an important problem is requirement of high diffraction efficiency of the BSO hologram and high contrast of holographic interference fringes. At first, hologram recording characteristics of the BSO crystal are investigated theoretically and experimentally. The important factors for obtaining high diffraction efficiency (applied electric field, trap density, spatial frequency, absorption coefficient and polarization property) becomes clear. Next influence of thickness of crystal and material parameter (trap density, values of mu tau) to diffraction efficiency and photorefractive response are investigated experimentally. Polarization of diffracted wave and transmitted wave from BSO crystal are measured for improvement of contrast of holographic interference fringes.Hologram recording characteristics to BSO crystal by He-Ne gas laser are measured and the light source can be used to holographic inferometric measurement of transparent objectsRefractive index change of transparent object is measured by holographic interferometry with BSO single-crystal using He-Ne laser. Wave fronts of standing ultrasonic waves in alcohol can be visualized at real time as the fringe shifts due to the index change by the interferometry.The fringe shifts are recorded through CCD camera and by the digital image processeing with Fourier transform method the phase of the fringes are determined. The linear distributions of peek sound pressure are observed and measured the amplitude and the ultrasonic wave length.Farther, transient sound pressure changes of traveling ultrasonic wave in the alcohol are measured by the method.

本文研究了用BSO单晶全息干涉术观察和测量密度变化场的实验系统。在这种情况下，一个重要的问题是要求BSO全息图的高衍射效率和全息干涉条纹的高对比度。本文首先对BSO晶体的全息记录特性进行了理论和实验研究。获得高衍射效率的重要因素（外加电场、陷阱密度、空间频率、吸收系数和偏振特性）变得清晰。实验研究了晶体厚度和材料参数（陷阱密度、μ τ值）对衍射效率和光折变响应的影响。为了提高全息干涉条纹的对比度，测量了BSO晶体衍射波和透射波的偏振态，测量了He-Ne气体激光器对BSO晶体的全息记录特性，并将该光源用于透明物体的全息干涉测量，用He-Ne激光器对BSO单晶进行全息干涉测量，测量了透明物体的折射率变化。用干涉法在真实的时间内观察到超声驻波在酒精中的波前，即折射率变化引起的条纹位移，用CCD摄像机记录条纹位移，用傅里叶变换方法进行数字图像处理，确定条纹的相位。观察了峰值声压的线性分布，测量了振幅和超声波波长，并进一步测量了行波在酒精中的瞬态声压变化。