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Quantum-cascade lasers as local oscillators for heterodyne spectrometers in the spectral range around 4.745 THz, Schrottke, L, Wienold, M, Sharma, R, Lü, X, Biermann, K, Hey, R, Tahraoui, A, Richter, H, Hübers, H-W, Grahn, H T
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Schrottke et al. (2013) studied this question.
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