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Abstract

In evaporation of an organic hard tissue, a damage of a light emitting face of an optical fiber composing a laser probe is suppressed. A laser light source 13 outputs pulsate laser light of a wavelength of 1.0 .mu.m to 5.5 .mu.m and an output energy of 1 mJ to 2,500 mJ. The laser light is guided to a contact type handpiece 15 via a waveguide 14. The operator makes a light emitting face 17 of an optical fiber 9 of a probe 16 which is detachably attached to the tip end of the handpiece 15 contact with the surface of an organic hard tissue. In the optical fiber 9, an intermediate layer exists between a core 25 and a clad 26. The refractive index of the intermediate layer is smaller than that of the clad. In the refractive index distribution of the core 25, the refractive index is increased as moving from the center axis to the periphery. The laser light guided to the handpiece 15 passes through the optical fiber 9 of the probe 16 and is then emitted from a light emitting face 17. A diseased part is irradiated with the laser light, and an organic hard tissue of the portion is evaporated.

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First Claim