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- Configuration for THz absorption spectroscopy: tunable THz QCL in continuous-wave mode; QCL operating temperature 44.30 K or 54.45 K with <5 mK stability; laser frequency tuned by linearly ramping input current from a laser driver controlled by a function generator providing 10 Hz sawtooth waveforms; phase-locked optical chopper at 5 Hz; collimated beam diameter ~3 mm; laser beam path at ~18 mm above RF electrode; effective absorption length 84 cm
- Configuration of the THz QCL: continuous-wave mode; Operating temperature: 44.30 K; Temperature fluctuations: < 5 mK; Waveform: sawtooth; Frequency: 11 Hz