研究目的
To demonstrate room-temperature generation and detection of continuous-wave, broadly tunable, narrow-linewidth THz radiation for high-resolution spectroscopy in the 1–7.5 THz spectral range.
研究成果
The setup uniquely combines an ultra-broad spectral coverage, spanning from 0.97 to 7.5 THz, a μW-level emission power, and an absolute frequency reference, enabling measurements of molecular transition frequencies at an accuracy of approximately 10?9. This level of accuracy could significantly improve molecular models and help compare previous data with present results by using pressure shift data.
研究不足
The current limit to the accuracy achievable with the setup is represented by the Doppler-limited transitions. Cryogenic detection or interrogating a cold gas sample could overcome this limitation.
1：Experimental Design and Method Selection:
The experiment utilizes a Cherenkov phase-matching scheme in a channel waveguide within a nonlinear crystal for THz generation.
2：Sample Selection and Data Sources:
Methanol vapors are used for spectroscopic tests to assess the spectrometer's performance.
3：List of Experimental Equipment and Materials:
Includes commercial cw-laser systems, fiber amplifiers, a wavelength meter, a Golay-type detector, and a spectroscopy cell.
4：Experimental Procedures and Operational Workflow:
Two cw-laser systems seed two distinct fiber amplifiers, whose output beams are overlapped and coupled into a channel waveguide for THz generation. The THz radiation is then collimated and sent through a spectroscopy cell for analysis.
5：Data Analysis Methods:
The acquired profiles are fitted to Voigt functions to retrieve transition frequencies and assess the spectrometer's accuracy.
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Toptica DL Pro
DL Pro
Toptica
Provides narrow linewidth radiation at telecom wavelengths for seeding the THz generation process.
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MOT/DL Pro
MOT/DL Pro
Toptica
Provides narrow linewidth radiation at telecom wavelengths for seeding the THz generation process.
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IPG Photonics EAR-10K-C-SF
EAR-10K-C-SF
IPG Photonics
Fiber amplifier operating between 1540 and 1565 nm wavelength, providing a tunability range of about 3 THz.
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IPG Photonics EAR-7K-1575-SF
EAR-7K-1575-SF
IPG Photonics
Fiber amplifier operating in the 1573–1577 nm band.
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IPG Photonics EAR-3K-1605-SF
EAR-3K-1605-SF
IPG Photonics
Fiber amplifier operating in the 1603–1607 nm band.
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Stanford Research Systems SR-830
SR-830
Stanford Research Systems
Lock-in Amplifier for demodulating the THz signal modulated at 10 Hz.
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Menlo Systems C-fiber HP
C-fiber HP
Menlo Systems
Telecom mode-locked femtosecond laser used as a frequency ruler for providing an absolute scale for the THz radiation.
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Thorlabs DET10C/M
DET10C/M
Thorlabs
Fast detector for mixing the two cw seed lasers with the closest teeth of the femtosecond laser.
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Bristol model 721
721
Bristol
Wavelength meter providing a measurement of the pump and signal emission frequencies.
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Tydex GC-1P
GC-1P
Tydex
Low-noise Golay-type detector for detecting the generated optical power in a non-coherent scheme.
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