Sagnac lnterferometry for Background Subtraction in Pump-Probe Spectroscopy
نویسندگان
چکیده
We describe a novel pump-probe optical method, based on a Sagnac (anti-resonant ring) interferometer, which removes over 99% of the DC background light inherent in normal, two beam pump-probe measurements. Suppression of the DC component is critical for pumpprobe imaging applications. In addition, this method greatly increases the signal-to-noise ratio compared with normal, two beam pump-probe measurements. The technique is demonstrated by detection of Rb atoms aspirated into a flame. The placement of the flame near the center of the ring interferometer reduces noise caused by flame turbulence.
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