Antiresonant-ring transient spectroscopy
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Updated: Jun 20, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Abstract:
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.
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