Common-Path Dual-Comb Spectroscopy Using a Single Electro-Optic Modulator

Dual frequency comb (DFC) spectroscopy using electro-optic comb generators stands out for its flexibility, easy implementation, and low cost. Typically, two combs with different line spacing are generated from a common laser using independent electro-optic comb generators. This approach minimizes th...

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Bibliographic Details
Published in:Journal of lightwave technology 2020-09, Vol.38 (18), p.5107-5115
Main Authors: Soriano-Amat, Miguel, Soto, Marcelo A., Duran, Vicente, Martins, Hugo F., Martin-Lopez, Sonia, Gonzalez-Herraez, Miguel, Fernandez-Ruiz, Maria R.
Format: Article
Language:English
Subjects:
Arbitrary waveform generation
brillouin scattering
Compression tests
dual comb spectroscopy
Electrooptic modulators
Flexibility
Frequency modulation
Generators
Laser stability
Lasers
Narrowband
Optical filters
optical frequency combs
Optical interferometry
Optical saturation
Optics
Radio frequency
Signal to noise ratio
Spectroscopy
Spectrum analysis
Systems stability
Waveform generators
Waveforms
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Summary:Dual frequency comb (DFC) spectroscopy using electro-optic comb generators stands out for its flexibility, easy implementation, and low cost. Typically, two combs with different line spacing are generated from a common laser using independent electro-optic comb generators. This approach minimizes the impact of laser phase noise; however, the distinct paths followed by the two combs ultimately limit the attainable signal-to-noise ratio and long-term stability of the system. In this work, a common-path DFC is generated using a single modulator driven by an arbitrary waveform generator, thus enabling a remarkable increase of the system stability (up to 0.8 s of integration time) while maintaining high flexibility. The proposed technique is experimentally validated by implementing a dual frequency comb with 3000 lines, covering an optical bandwidth of 4.5 GHz, and demonstrating an optical-to-radiofrequency compression factor of 7500. Our system is able to measure extremely narrowband optical features (in the MHz range) with an accuracy only limited by the master laser stability.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.2998372