Abstract: In holographic experiments,spectroscope with fixed dispersion of light ratio divides a bunch of laser into two bunches(the reference light and the object light).But because the dispersion of light ratio cannot be adjusted as one pleases,the experimental results are not satisfactory.The authors use the double prism instead of the spectroscope to solve the limitation.Therefore,feasibility and the success ratio in hologram experiment can be increased.

Key words: holography, double prism, reference light, object light