Additive and subtractive coherence peaks in pump and probe experiments with high repetition rate fs laser pulses in a flowing malachite green solution

Abstract

Pump and probe absorption bleaching experiments with femtosecond laser pulses in a flowing dye solution lead to a coherence peak or coherence dip at zero time delay. The size and sign of this peak are strongly affected by the flow velocity of the solution. Experimental results are in good agreement with a two-wave mixing theory, which takes pump and probe coupling by an absorption and a temperature grating into account.