Antiresonant-ring transient spectroscopy.
We show theoretically and experimentally that the antiresonant ring is a versatile detection arrangement in ultrafast spectroscopy that permits accurate optical subtraction of probe-laser background light, independent measurement of absorption and refractive-index transients through optical heterodyning, and improvement of signal-to-noise ratios. In addition, because the sample medium is placed off center in the ring, it also permits tunable high-pass filter operation: signals from effects with time scales longer than twice the light travel time from the sample to the ring center can be suppressed.
R
R
Trebino
C C
CC
Hayden