| 摘要 |
PURPOSE:To detect ultrasonic wave flexibly from the optional position of a sample by constituting a titled device in such a way that pulse laser light and laser light for diagnosis irradiate the respectively different points on the sample surface. CONSTITUTION:The output light from a pulse laser light source 1 of large output is partly detected with a photodetector 3 by the use of a beam splitter 2 to detect the timing of the emission thereof from the light source 1. The pulse laser light transmitted through the splitter 2 is introduced through a coupling lens 4 into an optical fiber 6, and propagates therein. The light from the fiber 6 is irradiated with a focusing lens system 7 to one point P on a sample surface 8. The exit light from laser 9 for diagnosis, on the other hand, is introduced through a beam splitter 10 and a coupling lens 11 to an optical fiber 12, and propagates in the fiber 12. The light from said fiber is irradiated with a focusing lens system 7 to the other one point Q differing from the above-described irradiation point on the surface 8. The ultrasonic wave is thus detected flexibly from the arbitrary position of the sample. |
