CPC G02B 6/4201 (2013.01) [G01R 33/26 (2013.01)] | 12 Claims |
1. An excitation light irradiation device comprising:
a substrate having a color center, the color center being configured to be excited by an excitation light incident to the substrate, the substrate including:
first and second reflection surfaces reflecting the excitation light;
first and second end surfaces facing each other; and
an incident auxiliary member having an incident surface and an emission surface which is joined to the first reflection surface,
wherein, the excitation light enters into the incident surface of the incident auxiliary member, passes through the incident auxiliary member, and emits from the emission surface of the incident auxiliary member into the first reflection surface of the substrate,
the excitation light, which has entered into the first reflection surface of the substrate, travels from a first area near the first end surface to a second area near the second end surface while repeatedly reflecting between the first and second reflection surfaces, and
the incident surface of the incident auxiliary member and the first end surface are coplanar.
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