To make it possible to use a light guide device for making pass intensive light, measuring a temperature of an object of high temperature or observing the object by effectively cooling the light incident end part of the light guide.
The light incident end part 35 of the light guide 31 is immersed in a translucent liquid 38 within a liquid holding part 37. Thus, the liquid 38 is brought into direct contact with the light guide 31 to deprive the light guide 31 of heat. A capability in heat resistance of a light guide device 30 is more improved by providing the liquid holding part 31 with a temperature adjusting mechanism and performing cooling and heat radiation of the liquid 38. A degree of freedom for designing the temperature adjusting mechanism is increased and the temperature adjusting mechanism having a satisfactory heat radiating capability is formed by placing the temperature adjusting mechanism at a place apart from the light incident end part immersing part. Satisfactory cooling is obtained in spite of the place where temperature rising owing to concentration of light energy is not avoided by immersing in liquid the light incident end part of the light guide on which light condensed by a condensing optical system is made incident.
TEJIMA WATARU
MIYAGAWA YOSHIHIRO
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