| 摘要 |
PURPOSE:To dispense with a power meter provided at a laser beam by providing at least at one mirror of fully reflecting mirror forming a resonator a temperature detecting means for measuring the temperature difference on the mirror surface and monitoring the laser power. CONSTITUTION:A laser light generated in a laser medium 1 is reflected on a fully reflecting mirror 2, against passed through the medium 1, and passed through a partially reflecting mirror 3 to be irradiated as a laser beam 4. In this configuration, the mirror 2 is formed of silicon evaporated or the like metal such as copper, molybdenum or the like, supported by a mirror holder 10 having a recess for circulating coolant 11, and an aperture 12 for controlling the sectional area of the beam is mounted at the reflecting surface. Further, a thermocouple 8 of star-connected Alumel.Chromel is adhered to the back surface of the mirror 2, produced electromotive force is measured by a miniature voltmeter 9. In this manner, it can obtain the incident beam power to the mirror 2 so as to simply control the laser inexpensively without power meter. |
