三色光栅制作真彩色全息图

True colour hologram making with the help of tricolour grating

用加有三色光栅的照相机在黑白胶片上记录下真实景物的三基色编码像。用反转加工法冲洗出正片 ,再经漂白处理得到景物像的三基色编码片。用单色激光器和 4f光学滤波系统分离出编码片上记录的三基色图像信息 ,并用散射参考光记录下景物的彩色景物全息图。本方法的优点是不需制作彩色景物的三张分色透明片 ,并消除了三次曝光全息记录中所需三张透明片定位问题。制得的彩色全息图再现像更清晰 。

The information of three primary colour images of a natural scene is encoded on a black-and white photographic film by a camera with a tricolour grating.By reversal process a positive image film is obtained and by bleaching it become the final encoded film.A 4f filtering optical system is used to decode the film to obtain the information of each primary colour image of the scene respectively.From the decoded images a true colour hologram is made by a special method of diffusion reference light with a monochromatic laser.The merit of this method is that the process is simplified largely,using only one film instead of three films and removing the requirement of successively setting the images of the three films in a same position precisely in the process of holographic record.The reconstructed colour image of the hologram made with this method is clearer and more colourful than previous methods.