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Cavity-Enhanced Direct Frequency Comb Spectroscopy has been applied to buffer gas cooled acetylene achieving a Doppler-limited spectral resolution of 90 MHz. Additionally Time Resolved Frequency Comb Spectroscopy allows for the detection of trans-DOCO in photolysis reaction kinetics with a molecular sensitivity of 1010 cm−3.
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.
We employ cavity ring-down to perform absorption experiments of InGaAs/GaAs QDs. Integrating an AlAs/GaAs DBR incorporating InGaAs QD's into a Fabry-Perot cavity, we demonstrate this approach and its potential for sensitive measurements on semiconductor nanostructures.
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