多光源分区照明实现全息照片的景深扩展

Expansion depth of the field in holography by multiple laser sources

为了获得较大景深的全息照片,采用了多组同类激光器分区照明被拍摄物体和全息干板,单次记录或多重记录全息图的方法。克服了由于受到激光器功率和激光光源相干长度的制约而引起的高的拍摄费用。经过实验,能获得景深达120cm以上的、清晰的全息照片。

In order to obtain more depth of field holographic photos, methods of adopting multiple groups of cheap lasers with same types to irradiate the objects photographed and holographic dry plate at the same time, single record and multiplexed records of hologram are used. It overcomes high cost photographing because of the constraints of coherent lengths of laser power and laser sources. By the experiments, clear holographic photos of which photographing depth of field is 120cm are achieved.