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进行全息照相时,物光和参考光的夹角决定了干涉条纹的空间频率。通常干涉条纹的空间频率很高,要求记录介质有很高的分辨率,所以专门用于全息的照相干版,其分辨率必须高达每毫米几千线。但是高分辨的记录材料不但价格昂贵,而且感光速度很低,比普通摄影胶卷低3～4个数量级,因此曝光所需时间很长,不但要求工作台防震,而且给记录短暂现象的全息照相带来很大的困难。目前,如果希望记录微秒数量级的全息照相。必须使用脉冲工作的红宝石或氩离子激光器,而无法使用简单方便的氦-氖激光器。国外曾经试验过用135微粒胶卷来进行全息照相,曝光时间只需要0.01秒,这样就
When holography, the angle between the object light and the reference light determines the spatial frequency of the interference fringes. Usually interference fringes have a high spatial frequency and require very high resolution of the recording medium. Therefore, a photographic dry film exclusively for holography must have resolutions up to several thousand lines per millimeter. However, the high-resolution recording material is not only expensive but also has a low light-sensitive speed, which is 3 to 4 orders of magnitude lower than that of ordinary photographic film. Therefore, exposure takes a long time, not only requiring a desk to be shockproof but also giving a hologram Great difficulty. Currently, it is desirable to record holograms on the order of microseconds. Pulsed ruby or argon ion lasers must be used, and a simple and convenient helium-neon laser can not be used. Foreign countries have experimented with holographic 135 photographic film holography, exposure time only 0.01 seconds, so