Apparatus for forming nano-grating device

An apparatus for forming a nano grating device, comprising:

• a light source, used to emit a first beam;
• a beam splitter, mounted on one side of the light source to split the first beam emitted from the light source into two second beams;
• two reflectors, mounted on the other side of the splitter opposite to the light source to respectively receive the second beams generated by the light splitter and then reflect a third beam;
• two light emitting modules, mounted on the other side of the reflectors opposite to the light splitter to respectively receive the third beams from the reflectors and generate a fourth beam;
• and
• a hemi-sphere lens, having a flat surface and being mounted on the other side of the light emitting modules opposite to the reflectors, a photosensitive substrate is attached onto the flat surface, and each of the fourth beam travels along the same optical paths to reach the photosensitive substrate that is later exposed to form a grating structure;
• wherein after the grating structure is formed on the photosensitive substrate, rotating and exposing the photosensitive substrate to form another grating structure crossing the grating structure that constructs a filter.