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Noise analysis and noise reduction methods in kilohertz pump-probe experiments.

Kevin E H Anderson¹, Samuel L Sewall, Ryan R Cooney

¹Department of Chemistry, McGill University, Montreal, Quebec H3A 2K6, Canada.

The Review of Scientific Instruments

|August 4, 2007

Summary

We developed a method to reduce noise in kilohertz pump/probe experiments by filtering out problematic laser scatter signals. This improves signal averaging for clearer experimental results.

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Area of Science:

Optical Physics
Spectroscopy
Experimental Methods

Background:

Kilohertz frequency pump/probe experiments are susceptible to instrumental and environmental noise.
Low-frequency, large-amplitude noise signals significantly hinder signal averaging, a common technique for improving signal-to-noise ratio.
Sources of this noise include laser scatter from bubbles, dust, and defects.

Purpose of the Study:

To analyze the sources of experimental noise in kilohertz pump/probe setups.
To present a novel method for reducing experimental noise by identifying and filtering noisy data points.
To quantify the effectiveness of the proposed noise reduction technique.

Main Methods:

Power spectrum analysis to characterize instrumental noise.
Histogram analysis to identify low-frequency, large-amplitude noise signals.
Development and implementation of a filtering algorithm to reject noisy shots.

Main Results:

Instrumental noise exhibits high-frequency, small-amplitude modulations.
Low-frequency, large-amplitude signals, often from laser scatter, were identified as a major obstacle to signal averaging.
The developed filtering method effectively identifies and rejects these detrimental signals, improving signal-to-noise ratio.

Conclusions:

Filtering noisy shots is crucial for effective signal averaging in kilohertz pump/probe experiments.
The proposed method successfully mitigates noise caused by laser scatter.
This technique enhances the reliability and accuracy of pump/probe spectroscopy.