Through the holographic experiment, what experimental methods have you obtained, as well as your understanding and experience of this experiment?

Process method: the laser beam is divided into two beams; A laser beam is directly projected on the photosensitive film, which is called reference beam; Another laser beam is projected on an object, and after being reflected or transmitted by the object, it carries the relevant information of the object, which is called object beam. After processing, the object beam is also projected to the same area of the photosensitive film. On the photosensitive film, the object beam and the reference beam are coherently superimposed to form interference fringes, thus completing the hologram.

Understanding: Holography is a cutting-edge technology. Holography is different from traditional photography. What is recorded on the negative is not the plane image of a three-dimensional object, but the light field itself. Conventional photography only records the change of light intensity on the surface of the reported object, that is, only records the amplitude of light, while holographic photography records all the information of light waves, forgetting to record the phase of light waves except amplitude. That is to say, all the information of the optical wave field of the three-dimensional object is stored in the recording medium.