Reflection and transmission hologram

Reflection hologram: If recording material in hologram is placed such that reference beam and object beam approach it from two opposite sides, then hologram formed is called Reflection Type hologram. The interference fringes are usually parallel to the surfaces of recording medium. When such a hologram reconstructed, then reference beam and object beam lie on the same side of hologram.

 Transmission hologram: If the recording material in hologram is arranged such that reference beam as well as object beam approach it from the same side, then hologram formed is called Transmission Hologram. The interference fringes are generally perpendicular to the surfaces of the recording material. When such a hologram is reconstructed, then reference and object beam lie on opposite sides of the hologram.

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