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Adaptive dual-comb spectroscopy in the green region
T Ideguchi1, A Poisson, G Guelachvili
1Max Planck Institut für Quantenoptik, Garching 85748, Germany.
Optics Letters
|December 4, 2012
Summary
Dual-comb spectroscopy now operates in the visible range using frequency-doubled fiber lasers. This technique records distortion-free spectra of iodine with high resolution in milliseconds.
Area of Science:
- Laser Spectroscopy
- Quantum Optics
- Molecular Spectroscopy
Background:
- Dual-comb spectroscopy (DCS) is a powerful technique for high-resolution molecular spectroscopy.
- Extending DCS to the visible spectral range presents challenges due to laser requirements and spectral stability.
Purpose of the Study:
- To extend dual-comb spectroscopy into the visible spectral region.
- To demonstrate a method for recording distortion-free spectra in the visible range.
- To achieve high-resolution spectral recording of molecular samples.
Main Methods:
- Utilized two short-pulse, frequency-doubled, free-running ytterbium-doped fiber lasers.
- Employed nonlinear frequency conversion to shift spectra to other domains.
- Implemented a correction signal derived from relative fluctuations of femtosecond oscillators at their fundamental wavelength.
Main Results:
- Successfully extended dual-comb spectroscopy to the visible spectral range.
- Achieved distortion-free recording of spectra by automatically correcting for laser fluctuations.
- Recorded the dense rovibronic spectrum of iodine around 19,240 cm(-1) within 12 ms.
- Obtained Doppler-limited spectral resolution.
Conclusions:
- Frequency-doubled free-running fiber lasers are suitable for visible dual-comb spectroscopy.
- The developed correction method effectively compensates for laser phase noise.
- This advancement enables rapid, high-resolution spectroscopic analysis in the visible spectrum.
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