绝大多数光学仪器只记录某一平面上光强分布构成的图象,其实最有价值的往往是物体的全部信息:在大多数情况下,相位特性(即空间特性)、光谱特性或偏光特性起主导作用。全息术所表征的信息,从根本上改变了物体本身的概念。二十年来,全息术已成为科技发展的新兴领域,成为完全独立的、同时又与其它领域息息相关的学科。就应用而言,不仅取得一些崭新的成就,而且常常获得大量令人难以置信的应用。全息术的飞速发展,首先在于激光的出现以及随之推进的相干光学领域的进 Most optical instruments record only the image of a light intensity distribution in a certain plane. In fact, the most valuable information is always the information of an object. In most cases, the phase characteristics (ie, spatial characteristics), the spectral characteristics, or the polarization characteristics Play a leading role. The information characterized by holography has fundamentally changed the concept of the object itself. For two decades, holography has become an emerging field for the development of science and technology and has become completely independent and closely related to other fields as well. In terms of applications, not only new achievements have been made, but often incredible amounts of incredible use. The rapid development of holography, first and foremost in the emergence of the laser and the accompanying advances in the field of coherent optics