| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a measuring device for physical property of sample by optically detecting the response from a sample to the irradiation with an ultra short optical pulse. SOLUTION: A Sagnac type common path optical interferometer capable of measuring physical properties at a vertical incident angle is constituted. This interferometer consists of a 2-arm Sagnac type interferometer, which uses three beam splitters. In measurement, the sample 14 is excited with the ultra short optical pulse, and the changes in intensity and phase of the optical beam caused at that time are detected. Accordingly, physical properties such as thickness, acoustic velocity, thermal property and the like of a substance can be extensively measured.</p> |
