High-resolution electro-optically sampled broadband dual-comb spectroscopy across mid-IR to terahertz at video rate
Ultrabroadband electro-optic sampling with few-cycle optical pulses is known to be an extremely sensitive technique to detect electric field amplitudes. By combining this method with dual-comb spectroscopy and with a new class of ultrafast lasers, we perform high-resolution (200,000 comb-mode spectr...
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| creator | Konnov, Dmitrii Muraviev, Andrey Vasilyev, Sergey Vodopyanov, Konstantin |
| description | Ultrabroadband electro-optic sampling with few-cycle optical pulses is known to be an extremely sensitive technique to detect electric field amplitudes. By combining this method with dual-comb spectroscopy and with a new class of ultrafast lasers, we perform high-resolution (200,000 comb-mode spectral lines) at up to a video rate of 69 Hz and with the high dynamic range limited by the shot noise of the near-IR EOS balanced detection. Our long-wavelength IR measurements with low-pressure gases: ethanol, isoprene, and dimethyl sulfide reveal spectroscopic features that had never been explored before. |
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By combining this method with dual-comb spectroscopy and with a new class of ultrafast lasers, we perform high-resolution (<10 MHz, 0.0003 wavenumbers) spectroscopic measurements across the whole frequency range of 1.5 to 45 THz (6.6-200 microns) with an instantaneous spectral coverage exceeding an octave (e.g., 9-22 microns). As a driving source, we use a pair of highly mutually-coherent low-noise frequency combs centered at 2.35 microns produced by mode-locked solid-state Cr: ZnS lasers. One of the two combs is frequency downconverted via intrapulse difference frequency generation to produce a molecular sensing comb, while the second comb is frequency doubled to produce a near-IR comb for electro-optic sampling (EOS). An ultra-low intensity and phase noise of our dual-comb system allows capturing a vast amount of longwave spectral information (>200,000 comb-mode spectral lines) at up to a video rate of 69 Hz and with the high dynamic range limited by the shot noise of the near-IR EOS balanced detection. Our long-wavelength IR measurements with low-pressure gases: ethanol, isoprene, and dimethyl sulfide reveal spectroscopic features that had never been explored before.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Broadband ; Dimethyl sulfide ; Electric fields ; Ethanol ; Frequency ranges ; High resolution ; Infrared spectroscopy ; Isoprene ; Line spectra ; Low pressure gases ; Optical pulses ; Phase noise ; Sampling ; Shot noise ; Spectrum analysis ; Ultrafast lasers</subject><ispartof>arXiv.org, 2023-07</ispartof><rights>2023. 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| subjects | Broadband Dimethyl sulfide Electric fields Ethanol Frequency ranges High resolution Infrared spectroscopy Isoprene Line spectra Low pressure gases Optical pulses Phase noise Sampling Shot noise Spectrum analysis Ultrafast lasers |
| title | High-resolution electro-optically sampled broadband dual-comb spectroscopy across mid-IR to terahertz at video rate |
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