摘要
由于彩虹全息制作中的狭缝限制了光能的利用率,且光路复杂,为此提出了一种无狭缝彩虹全息制作方法。利用数字微镜(DMD)的光栅特性,从数字微镜上出射的光,经过透镜的傅里叶变换后,在透镜的后焦面上形成频谱。除中心主级次频谱外,频谱点从后焦面衍射传播到像面过程中,各级频谱扩散,在像面完全重合成图像后进行叠加,形成干涉条纹。因此,在实验光路中无需使用狭缝和外加参考光就能制作准彩虹全息图。实验中,用全息干版记录全息图,并利用转动记录介质的方式进行了分层次记录。在显微镜下,可以清楚地观察到全息图的干涉条纹,白光再现时,能够观察到明显的彩色光谱。
The utilization rate of optical wave energy is limited because of the use of slit in the rainbow hologram technology. A new method of making rainbow hologram is proposed. Due to the special two dimensional grating structure of digital micro-mirror, a number of spectrum points would be formed in the back focal plane of the Fourier transform lens. In the diffraction spread of these spec- trum points from the back focal plane to the imaging plane, these spectrum points are expanding continuously. These points superpose completely in the imaging plane except the zero level spectrum points. Interference fringes have been observed. As a result, we can make the approximate rainbow hologram without slit and reference beam, by use of the characteristic of digital micro-mirror. In this paper, we have discussed some related theory in detail and described the experiment about it. In the experiment, we have recorded the image by the dry plate and also acquired the laminated hologram by rotating the dry plate. Under the microscope, we can watch the interference fringe clearly. And we can survey the rainbow spectrum in the white light.
出处
《南昌航空大学学报（自然科学版）》
CAS
2012年第2期30-34,共5页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
国家自然科学基金(61072131)
