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 of absorption and refractive-index transients through optical heterodyning, and improvement of measurement ratios. In addition, because the sample medium is placed off center in the ring, it also permits signal-to-noise high-pass filter operation: signals from effects with time scales longer than twice the light travel time from tunable the sample to the ring center can be suppressed.
© 1991 Optical Society of America
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