期刊
OPTICS EXPRESS
卷 22, 期 8, 页码 9734-9748出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.22.009734
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资金
- NSFC [61327902, 61275205, 11104294, 61108015]
- Shanghai Natural Science Foundation [11ZR1441600]
- Program of Shanghai Subject Chief Scientist [11XD1405500]
- Air Force Office of Scientific Research [FA9550-10-1-0394, FA9550-10-0561, FA9550-12-1-0482]
We report on experimental examination of two-photon fluorescence excitation (TPFE) at the focus of a spatially chirped femtosecond laser beam, which reveals an unexpected tilted peak intensity distribution in the focal spot. Our theoretical calculation shows that the tilting of the peak intensity distribution originates from the fact that along the optical axis of objective lens, the spatiotemporally focused pulse reaches its shortest duration exactly at the focal plane. However, when moving away from the optical axis along the direction of spatial chirp of the incident pulse, the pulse reaches its shortest duration either before or after the focal plane, depending on whether the pulse duration is measured above or below the optical axis as well as the sign of the spatial chirp. The tilting of the peak intensity distribution in the focal spot of the spatiotemporally focused femtosecond laser beam can play important roles in applications such as femtosecond laser micromachining and bio-imaging. (C) 2014 Optical Society of America
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