Abstract

The temporal evolution of refractive-index change produced by a tightly focused femtosecond (fs) laser pulse inside a soda-lime glass plate was investigated by use of a transient lens method with subpicosecond time resolution. An oscillating behavior of the light intensity in the central region of the probe beam was observed 0–1500 ps after irradiation of the plate. The oscillation was interpreted in terms of a rapid temperature increase and the ensuing propagation of the pressure wave. This study is to our knowledge the first real-time observation of refractive-index change inside a glass induced by a fs laser pulse.

© 2004 Optical Society of America

Observation of pressure wave generated by focusing a femtosecond laser pulse inside a glass

M. Sakakura, M. Terazima, Y. Shimotsuma, K. Miura, and K. Hirao
Opt. Express 15(9) 5674-5686 (2007)

In situ observation of photoinduced refractive-index changes in filaments formed in glasses by femtosecond laser pulses

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