CO₂レーザ誘起気泡柱を用いた水中加工に関する研究

（気泡柱透過レーザエネルギー見積法の検討）

抄録

This paper reports consideration of the transmission laser energy estimating method for an efficient underwater processing with support form a CO₂ laser-induced bubble column. To calculate the transmission laser energy through the laser induced bubble column in water, the experiment of pulsed CO₂ laser-induced bubble column formation visualization and laser energy measurement though the CO₂ laser-induced bubble column in water was performed. The process of the CO₂ laser-induced bubble generation was observed by high-speed video camera. Pulsed 50W CO₂ laser beam of 10.6 μm in wavelength was irradiated onto the water surface, and then bubble is generated near the water surface. With further transmission of laser beams through the growing the bubble, local vaporization was continued and the bubble length was elongated. The transmitted energy though the bubble column was estimated by time rate of bubble growth time and was corrected for absorption loss and reflectance loss, and compared with the measured transmitted energy by power meter.