Optical arithmetic device and production method for optical arithmetic device

An optical computing device comprising:

• a light-diffraction element group comprising planar light-diffraction elements made of a photo-curable resin;
• a tubular body that houses the light-diffraction element group and that has an inner surface to which at least a part of a perimeter of each of the planar light-diffraction elements is fixed;
• and
• a light conversion layer that converts infrared light into visible light downstream of a last planar light-diffraction element of the planar light-diffraction elements.

A method for producing an optical computing device comprising:

• a light-diffraction element group comprising planar light-diffraction elements made of a photo-curable resin;
• and a tubular body that houses the light-diffraction element group and that has an inner surface to which at least a part of a perimeter of each of the planar light-diffraction elements is fixed, the method comprising
• molding integrally the light-diffraction element group inside the tubular body, wherein
• a columnar body made of the photo-curable resin connects a first planar light-diffraction element of the light-diffraction element group to a second planar light diffraction element of the light-diffraction element group that is adjacent to the first planar light-diffraction element, and
• the molding comprises forming the light-diffraction element group inside the tubular body in a sequential molding manner by:
• either one of:
• immersing a lower end of the tubular body in a photo-curable resin in an uncured state, or
• injecting an uncured resin into the tubular body whose lower end is sealed;
• and
• applying light from below for irradiation while the light-diffraction element group is lifted such that a part thereof is above the photo-curable resin upon completion of curing of the part.