We recently have presented a real-time holographic interferometer using sillenite crystals connected with phase-shifting for quantitative measurement of diffuse objects deformations. In our basic set-up, the crystal, sandwiched between two polarizers, is set in front of the optical head and followed by a CCD camera with an imaging objective. With this system, for conventional objects and using 2.2 Watts of Ar3+ laser power @ 514 nm, interferograms can be observed on object fields of about 30 cm*20 cm (crystal size 1 cm*1 cm and 26 mm objective focal length). In this paper we present investigations to increase the observed field in the existing system and to be able to use lower power lasers. Since setting the object at larger distances should lead to an insufficient luminous level for hologram recording, we have proceeded by different ways. First, we use shorter focal length objectives, giving a larger field-of-view, and larger crystals have to be used in this case to avoid vignetting. Second, we use a large aperture frontal objective in order to collect more light and that images the object on the crystal, the final image being observed through relay imagery.
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机译：我们最近提出了一种实时全息干涉仪，该器件使用与相移连接的亚硅酸盐晶体来定量测量扩散物体的变形。在我们的基本设置中，将晶体夹在两个偏振器之间，放置在光学头的前面，然后是带有成像物镜的CCD摄像机。使用该系统，对于常规物体，使用514 nm @ 2.2瓦的Ar3 +激光功率，可以在约30 cm * 20 cm（晶体尺寸1 cm * 1 cm和26 mm物镜焦距）的物场上观察到干涉图。在本文中，我们将进行研究以增加现有系统中的观测范围，并能够使用低功率激光器。由于将物体放置在较远的距离会导致全息图记录的发光水平不足，因此我们采取了不同的方法。首先，我们使用较短的焦距物镜，从而获得更大的视野，在这种情况下，必须使用较大的晶体以避免渐晕。其次，我们使用大孔径正面物镜来收集更多的光，并将该物体成像在晶体上，最终图像是通过中继图像观察的。
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