Tuesday, 12 October 2004 - 10:30 AM

This presentation is part of : Femtosecond Laser Micro/nano-machining II

Measurement of femtosecond pulse streching in microscope objective

Nageswara Rao Tadepalli, Dennis R. Alexander, David W. Doerr, Raghavendra Kagita, Jianchao Li, and John Schiffern. Center for Electro-Optics, University of Nebraska-Lincoln, 248 WSEC, Box 880511, Lincoln, NE 68588

Laser pulses are stretched when they pass through an optical medium like micro objectives, lens system etc. Stretching of pulses would be more prominent in the case of ultrashort laser pulses (~ 10 fs). In this letter, we present measurements of the final pulse duration of the laser pulse passing through a microscope objective. In this case we have measured pulse stretching in Edmund Optics Achromatic Objective Micro 60X DIN, 0.85 NA. With the prior knowledge of the amount of pulse stretching, necessary chirp can be provided for the pulse to compensate stretching. These results provide the actual pulse duration after it passes through the micro objective, which gives better understanding of laser matter interaction during micro-machining and many other applications.

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