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We report recent developments of comb-based broadband absorption spectroscopy. The comb-line resolving approaches and Fourier transform spectroscopy with sub-nominal resolution overcome the frequency resolution limits of conventional techniques. Advantages for various applications will be discussed.
We report a system of two independent strontium optical lattice standards with 88Sr probed with a single shared ultra-narrow laser. We achieved frequency stability (frequency between two standards) of 7 × 10−17. The absolute frequency of the clock transition can be measured by the use of an optical frequency comb referenced to the UTC(AOS) and UTC(PL) via the 330-km stabilized fibre optic link of...
We report a system of two independent strontium optical lattice standards probed with a single shared ultra-narrow laser. This allows verification of relative stability of both optical standards. The absolute frequency of the clocks can be roughly verified by the use of an optical frequency comb with the GPS-disciplined Rb frequency standard or, more accurately, by a long distance stabilized fiber...
We combine a Tm-fiber frequency comb, phase-locked doubly-resonant GaAs optical parametric oscillator, multipass cell, and Fourier transform spectrometer to measure comb-resolved spectra at wavelengths of 3.1 to 5.5 micrometers for multiple gases at trace concentrations.
We present an OPO frequency comb spectrometer accessing the 2200–3700-cm−1 spectral range. The system allows rapid, high-resolution molecular fingerprinting for trace gas detection. Permitting further wavelength extension, recent development of a 2-μm comb is demonstrated.
Frequency-comb-based Fourier transform spectrometer operating in the 2100–3600 cm−1 range is presented. System allows rapid acquisition of broadband high resolution (120 MHz) spectra, detecting ppb-level concentrations of various molecules in 30s.
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