Method and apparatus for making hologram

A method of making a hologram, comprising the steps of:

• forming a monitoring hologram on a portion of a hologram plate;
• producing a monitoring beam based on a laser beam;
• splitting said laser beam and said monitoring beam into two beams, respectively;
• producing an object beam and a reference beam to be incident on a whole surface of said hologram plate from said two beams into which said laser beam is split and a monitoring object beam and a monitoring reference beam to be incident on said monitoring hologram on said hologram plate from said two beams into which said monitoring beam is split;
• allowing said monitoring object beam and said monitoring reference beam to be incident on said monitoring hologram on said hologram plate to form monitoring interference patterns;
• sensing an intensity of said monitoring interference patterns;
• comparing the sensed intensity of said monitoring interference patterns with a reference intensity and if the intensity of said monitoring interference patterns varies exceeding a tolerance limit of intensity variation, blocking said laser beam and allowing said monitoring object beam and said monitoring reference beam to be incident on said monitoring hologram on said hologram plate and if the intensity of said monitoring interference patterns varies within the tolerance limit of intensity variation, allowing said object beam and said reference beam to be incident on said hologram plate;
• and
• performing repeatedly said sensing and comparing steps so that said object beam and said reference beam are incident on said hologram plate only for a predetermined time period to record said hologram based on an interference phenomenon thereof.