Abstract
We have designed a multipass amplifier combined with a folded prisms optical compressor that generates 80 fs light pulses tunable between 580 and 630 nm when using sulforhodamine B in water. The external energy source is a 20 Hz repetition rate, doubled Nd: YAG laser, delivering 8 ns pulses. A numerical model has been developed that describes the dynamics of gain saturation and amplified spontaneous emission growth in a multipass pulses amplifier. This model predicts a gain Q-switched behavior of the multipass amplifier for high pumping levels.
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