Abstract

The wavelength of the free electron laser (FEL) in Osaka University can be continuously varied in the range of 5.020.0μm. The FEL has a double-pulse structure, consisting of a train of macropulses of pulse duration 12μs. Each macropulse contains a train of 330 micropulses of pulse duration 5ps. The tunability and picosecond pulses afford new medical and biological applications. However, a macropulse of long pulse duration leads to undesirable secondary effects. Precise control of the macropulse duration is essential for the high-precision applications of the FEL. An FEL pulse control system using acousto-optic modulators has been developed to investigate mechanical (shock-wave) effects of the FEL on living tissues. With this system, we have controlled photoinduced shock waves and determine the mechanism of interaction during FEL-induced tissue ablation.

© 2008 Optical Society of America

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