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Frequency multipliers based on superlattice ͑SL͒ devices as nonlinear elements have been developed as radiation sources for a terahertz ͑THz͒ laboratory spectrometer. Input frequencies of 100 and 250 GHz from backward wave oscillators have been multiplied up to the 11th harmonic, producing usable frequencies up to 2.7 THz. Even at these high frequencies the output power is sufficient for laboratory spectroscopy. Comparisons to conventional high-resolution microwave spectroscopy methods revealdoi:10.1063/1.2722401 pmid:17477648 fatcat:x6aitpn4nzfk5jjowt3y22bi3a