Here, we present a novel technique for time resolved experiments without any moveable external delay line. Optical Sampling by Cavity Tuning (OSCAT) method is based on a femtosecond laser with a tunable repetition rate and a passive delay line. The time delay between the pump and probe pulses is determined by the repetition rate of the femtosecond laser.

Journal of Infrared, Millimeter, and Terahertz Waves Vol. 32, p. 596 (2011)

doi: https://doi.org/10.1007/s10762-010-9670-8