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18 February 2009 Ultrashort pulse laser ionization microscopy
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Fundamental principles and advantages of the laser induced air ionization microcopy (LIAIM) and laser induced breakdown microscopy (LIBM) are introduced. Potential applications of these two new types of nonlinear imaging methods using ultrashort laser pulses in imaging both dielectric materials and bio-samples are demonstrated with some representative experimental results. Effects of different laser pulse widths on the discrimination power for laser-written microstructures inside transparent materials and the elemental composition are also investigated. It is shown that femtosecond laser induced ionization probe detects the variation of elemental composition of the sample materials with relatively higher contrast ratio, whereas the ionization probe generated by picosecond laser pulses is more sensitive to the material density or structural change. These observations can be well explained by the different roles of multi-photon ionization and avalanche ionization involved in material breakdown.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiaonong Zhu, Youbu Zhao, Nan Zhang, Yanmei Liang, Mingwei Wang, and Guoguang Mu "Ultrashort pulse laser ionization microscopy", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 72760W (18 February 2009);

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