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Updated: Jun 11, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Sensitivity of coherent dual-comb spectroscopy.
Nathan R Newbury1, Ian Coddington, William Swann
1National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305 USA. nnewbury@boulder.nist.gov
Optics Express
|July 1, 2010
Summary
Coherent dual comb spectroscopy achieves high-accuracy measurements. This study analyzes signal-to-noise ratio (SNR) and sensitivity limits for trace gas detection, proposing methods to enhance performance.
Area of Science:
- Spectroscopy
- Quantum Optics
- Analytical Chemistry
Background:
- Coherent dual comb spectroscopy offers high-resolution and high-accuracy measurements of sample response in both magnitude and phase.
- Understanding the signal-to-noise ratio (SNR) and sensitivity limits is crucial for trace gas detection applications.
Purpose of the Study:
- To analyze the achievable signal-to-noise ratio (SNR) in coherent dual comb spectroscopy, considering both additive white noise and multiplicative noise.
- To determine the sensitivity limits for trace gas detection using this technique.
- To investigate methods for improving SNR, such as sequential or parallel spectral acquisition.
Main Methods:
- Analysis of signal-to-noise ratio (SNR) considering additive white noise and multiplicative noise.
- Evaluation of trace gas detection sensitivity.
- Modeling of sequential acquisition using a tunable filter and parallel acquisition using a detector array.
Main Results:
- The study quantifies the achievable SNR and associated sensitivity limits for trace gas detection.
- Both sequential and parallel acquisition strategies can significantly improve SNR under specific conditions.
- A quality factor (SNR / sqrt(acquisition time) * number of resolved frequency elements) is identified as a key performance metric.
Conclusions:
- Coherent dual comb spectroscopy demonstrates significant potential for sensitive trace gas detection.
- Strategic spectral acquisition methods can enhance measurement performance.
- A quality factor of 10^6 - 10^7 Hz^(1/2) is achievable for single detector, fiber-laser based systems.
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