CPC G02B 7/008 (2013.01) [G02B 5/32 (2013.01); G02B 27/0172 (2013.01); G03H 1/0005 (2013.01); G03H 1/0272 (2013.01); G03H 1/181 (2013.01); G03H 1/2202 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01); G03H 2001/0088 (2013.01); G03H 2001/2231 (2013.01); G03H 2270/14 (2013.01); G03H 2270/21 (2013.01)] | 9 Claims |
1. An optical element comprising:
a hologram layer;
a resin substrate to which the hologram layer is adhered; and
a holder portion configured to support the resin substrate and having a thermal expansion coefficient smaller than that of the resin substrate, wherein
one of the holder portion and the resin substrate includes a contact surface along an axis extending in a plate thickness direction of the resin substrate, and
other of the holder portion and the resin substrate includes a pressing surface that presses the contact surface,
wherein a surface of the hologram layer adhered to the resin substrate extends from a first end to a second end, and the first end of the hologram layer to the second end of the hologram layer is a first length,
wherein a surface of the resin substrate adhered to the hologram layer extends from a first end to a second end, and the first end of the resin substrate to the second end of the resin substrate is a second length,
wherein the second length of the resin substrate is greater than the first length of the hologram layer,
wherein
the one of the holder portion and the resin substrate includes a concave portion,
the other of the holder portion and the resin substrate includes a convex portion that is inserted into the concave portion,
one of the concave portion and the convex portion configures the contact surface, and
other of the concave portion and the convex portion configures the pressing surface.
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