[21p-H116-1~22] 3.8 Optical measurement, instrumentation, and sensor

[21p-H116-16] Signal enhancement in femtosecond double-pulse LIBS with two polarizer configuration

〇Toshihiro Somekawa¹, Masataka Otsuka², Yoshinobu Maeda², Masayuki Fujita^1,3 (1.Inst. for Laser Tech., 2.Kinki Univ., 3.Inst. Laser Eng., Osaka Univ.)

Keywords:LIBS,double pulse

Femtosecond double-pulse laser induced breakdown spectroscopy (LIBS) has been performed with a double-pulse configuration composed of two polarizers. The effect of interpulse separation on the Cu I line at 510.55, 515.32, and 521.82 nm showed an optimum enhancement at 50-150 ps delays, which is more than 3-5 times greater compared with the single-pulse excitation case. This enhanced emission may open new possibilities for remote LIBS detection.