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 first light radiated by the radiation apparatus and received by the first photoreceptor and the second photoreceptor, the leak allowing second light to be leaked out in a direction crossing a light-guiding direction, the second light being part of the first light;
• a converter which is disposed along the first light guide and converts a wavelength of the second 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 third light radiated by the radiation apparatus and received by the third photoreceptor toward the second photoreceptor;
• and
• a return which is disposed on a side of the second photoreceptor of the first light guide and returns the third light guided by the second light guide.