Abstract
Laser processing and laser measurement has attracted attention from a vaiety of fields with the recent advances in laser technology. In particular, short pulse laser is useful in microfabrication and high-speed measurement, and further research of transient lens effect is expected. We have proposed a temporal and spatial pulse shaping technique with an effective refractive index change due to ransient lens effect. However, sub-nanosecond time scale change in refractive index of the transient lens effect has not been clear. In this study, we have established a method of time-resolved measurement of the refractive index change caused by the transient lens effect and measured tub-nanosecond time scale change in refractive index of the transient lens effect.
