F. Hindle, M. Guinet, S. Eliet, A. Cuisset, R. Bocquet, G. Mouret
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Large tuning range THz synthesiser by means of photomixing
Photomixing is an attractive solution for high resolution spectroscopy, nevertheless it has suffered from a lack of frequency metrology to determine the line centre frequencies. Frequency combs can provide excellent metrology of lasers, hence we propose a photomixing source that is phase locked to a frequency comb to overcome this problem. The resulting instrument has an accuracy of ΔνTHz/νTHz = 10−8, a spectral purity in the order of 50 kHz and can be continuously tuned over 200 MHz.
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