Light-emitting apparatus and light-emitting apparatus system

A light-emitting apparatus connected to a radiation apparatus which radiates laser light, the light-emitting apparatus comprising:

• a first light guide which includes a first photoreceptor at one end, a second photoreceptor at another end, and a leak, the first light guide guiding light radiated by the radiation apparatus and received by the first photoreceptor and the second photoreceptor, the leak allowing leakage light to be leaked out in a direction crossing a light-guiding direction, the leakage light being part of the light;
• a converter which is disposed along the first light guide and converts a wavelength of the leakage light leaked out of the first light guide;
• a second light guide which is disposed along the first light guide, includes a third photoreceptor, and does not include the leak, the second light guide guiding the light radiated by the radiation apparatus and received by the third photoreceptor to the second photoreceptor;
• and
• a protector which is tubular and in which the first light guide and the second light guide are disposed such that the first photoreceptor and the third photoreceptor are disposed at a same open end.