Abstract
The thermal lens (TL) effect induced by femtosecond laser pulses in chromium film is
reported. A Fresnel diffraction theory is used to explain the TL effect. The
intensity profile of the TL calculated by the theoretical model is in agreement with
the experimental results. The contrast ratio of the TL is defined to describe the TL
effect, and we find that the maximum contrast ratio of the TL effect is obtained
when the probe beam is recorded at a characteristic distance. The dependence of the
contrast ratio of the TL on different pump laser power levels and delay times is
also investigated. Numerical simulations are also consistent with the experimental
results.
© 2010 Optical Society of America
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