Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser

Jie Chen; Kazuki Nitta; Xin Zhao; Takahiko Mizuno; Takeo Minamikawa; Francis Hindle; Zheng Zheng; Takeshi Yasui

doi:10.1117/1.AP.2.3.036004

Advanced Photonics, Volume. 2, Issue 3, 036004(2020)

Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser On the Cover

Jie Chen^1,2, Kazuki Nitta^2,3, Xin Zhao¹, Takahiko Mizuno^3,4,5, Takeo Minamikawa^3,4,5,6, Francis Hindle⁷, Zheng Zheng^1,8、*, and Takeshi Yasui^3,4,5,6、*

Author Affiliations

¹Beihang University, School of Electronic and Information Engineering, Beijing, China

²Tokushima University, Graduate School of Advanced Technology and Science, Tokushima, Japan

³JST, ERATO MINOSHIMA Intelligent Optical Synthesizer, Tokushima, Japan

⁴Tokushima University, Institute of Post-LED Photonics, Tokushima, Japan

⁵Tokushima University, Graduate School of Technology, Industrial and Social Sciences, Tokushima, Japan

⁶Tokushima University, Research Cluster on “Multi-scale Vibrational Microscopy for Comprehensive Diagnosis and Treatment of Cancer”, Tokushima, Japan

⁷Université du Littoral Côte d’Opale, Laboratoire de Physico-Chimie de l’Atmosphère, Dunkerque, France

⁸Beihang University, Beijing Advanced Innovation Center for Big Data-based Precision Medicine, Beijing, China

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Figures & Tables(8)

Fig. 1. Principle of operation. (a) Flowchart of time-domain THz-DCS. (b) Acquisition of the temporal waveform using the adaptive sampling method.

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Fig. 2. Configuration of comb-mode-resolved adaptive sampling THz-DCS. SFG-X, sum-frequency-generation cross-correlator; BBO, beta-barium borate crystal; PC-THz comb, photocarrier THz comb; M, double-balanced mixer; FM, frequency multiplier (frequency multiplication factor $N = 40$ ); PCA, photoconductive antenna; and AMP, current preamplifier.

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Fig. 3. Performance of the dual-comb fiber laser. (a) Output spectrum of the laser. (b) RF spectrum of the dual-comb pulses. (c) Fluctuations of $f_{rep 1}$ , $f_{rep 2}$ , and $Δ f_{rep}$ . (d) Measured frequency instability of $f_{rep 1}$ and $Δ f_{rep}$ .

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Fig. 4. (a) Comparison of the temporal waveforms averaged 100,000 times obtained using different sampling clocks. Inset: a zoomed-in plot of the main THz pulse. (b) Comb-mode-resolved THz spectrum through air at room pressure. Inset: a zoomed-in plot around 0.5672 THz.

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Fig. 5. Comb-mode-resolved THz spectroscopy of a mixture gas sample of ${CH}_{3} CN$ and air with a total pressure of 360 Pa. Absorption spectra of ${CH}_{3} CN$ within the frequency range of (a) 0.2 to 0.72 THz and (b) 0.31 to 0.37 THz. The red stars indicate the manifolds of the rotational transitions for the vibrationally excited states. (c) Comparison of the absorption spectra between the database fitting and the experimental data and their residual and (d) the corresponding zoomed-in plot around 0.3310 and 0.3677 THz. (e) Absorption spectra around 0.3310 THz and (f) 0.3677 THz.

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Fig. 6. Mode-resolved absorption characterization of ${CH}_{3} CN$ around 0.331 THz at (a) 430 Pa, (b) 330 Pa, (c) 280 Pa, (d) 256 Pa, (e) 149 Pa, and (f) 115 Pa.

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Fig. 7. Pressure broadening characteristic of ${CH}_{3} CN / air$ gas.

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Table 1. Quantitative analysis of ${CH}_{3} CN / air$ -mixed gas.

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Table 1. Quantitative analysis of ${CH}_{3} CN / air$ -mixed gas.


Total pressure of ${CH}_{3} CN / air$ mixed gas (Pa)	Partial pressure of ${CH}_{3} CN$ gas (Pa)	FWHM linewidth of ${CH}_{3} CN$ rotation transition (MHz)
Result	Uncertainty	Result	Uncertainty
430	142	1	102	2
360	127	1	77	2
330	87	1	65	2
280	73	1	53	2
256	68	1	47	1
149	52	1	37	1
115	42	1	25	1

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Jie Chen, Kazuki Nitta, Xin Zhao, Takahiko Mizuno, Takeo Minamikawa, Francis Hindle, Zheng Zheng, Takeshi Yasui, "Adaptive-sampling near-Doppler-limited terahertz dual-comb spectroscopy with a free-running single-cavity fiber laser," Adv. Photon. 2, 036004 (2020)

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