Abstract
A colliding pulse modelocked (CPM) dye laser is presented, which contains a nonlinear KDP crystal for frequency conversion inside the ring resonator. The laser system emits femtosecond light pulses simultaneously at wavelenghts of 628 nm and 314 nm with a repetition rate of 80 MHz. The output power at 628 nm and 314 nm amounts to 4 mW and 1 mW, respectively. The duration of the red and the uv pulses has a value of approximately 120 fs. The light source is used in femtosecond pump-and-probe investigations. The kinetics of excited state adsorption and ground state bleaching of laser dyes is measured. The temporal resolution of the experiments is better than 40 fs.
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