| 摘要 |
For performing hologram recording or reproduction, an oscillation wavelength half value width Deltalambda of a coherent light source 21 satisfies a relationship of Deltalambda<lambda2/(Sx2 sin theta), when a substantial hologram size is S, a substantial cross angle between reference light and signal light is theta, and the oscillation wavelength of the coherent light source is lambda. Even when stray light is generated, the coherent light source 21 can suppress generation of an unnecessary interference fringe due to the stray light, and stably record and reproduce holograms.
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