Bounce-by-bounce cavity ring-down spectroscopy: femtosecond temporal imaging

A time microscope (100× magnification) allows light pulses exiting an optical cavity to be viewed one at a time. A linearly chirped Gaussian pulse is mixed in a nonlinear crystal with the dispersed input waveform; the up-converted light is sent onto an output dispersive network. The resulting temporal image is recorded both with a streak camera and with a spectrometer.