The FEL has the definite advantage of wavelength tunability and has two pulse structures (picropulses and macropulses) which elicit different laser-tissue interactions. The picropulses should cause photomechanical effects like spallation and cavitation. Both picropulses and macropulses should be able to cut tissue (via explosive vaporization) if focused to small spots. The average power of the FEL is sufficient for most forms of thermal coagulation therapy and photochemistry. In some cases, the FEL does not have an advantage over conventional lasers. Thermal coagulation therapy and photochemistry can be achieved with conventional lasers. The FEL may have a unique opportunity for photomechanical effects. Regarding optical diagnostics, the FEL may be synchronized with detection systems to enable time-resolved and frequency-domain measurements. In this short article, what we can do and how we use are deacribed.

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