| 摘要 |
PURPOSE:To prevent failure that an organization around a diseased part is destroyed and that the perforation of wall is caused to obtain high efficiency and to improve safety by converting the wavelength of laser light, which is outputted from a laser generation source, into the wavelength in a specified range by using a non-linear optical element. CONSTITUTION:A laser oscillator 2 is equipped with an Nd; YAG laser rod 3 and an excitation lamp 4 to excite the laser rod 3 and to output the laser light. Then, a full reflection mirror 5 and a partial transmission mirror 6 are provided with facing to the both ends of the laser rod 3 in order to resonate and amplify the laser light emitted from the laser rod 3. A second higher harmonic generation element 7 of the oscillator 2 converts the wavelength of the laser lift oscillated from the laser rod 3 into the half wavelength, for example. Since the laser light of the wavelength 1,32mum oscillated from the laser rod 3 is converted into the wavelength 660nm and outputted by the second higher harmonic generation element 7, a FIFO byte (a) of a diseased part 13 is irradiated with the laser light of the wavelength 660nm. Accordingly, even when excess energy is not put in, concentrated treatment can be executed to the diseased part 13 and the efficiency is improved. Then, the failure that the organization around the diseased part is destroyed or that the wall perforation is caused is prevented and the safety is improved. |
