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We have demonstrated terahertz (THz) passive imaging of a cold object using a 4 K-cryocooled THz photoconductive detector with BLIP at around 1.5–2.5 THz. In our imaging system, we achieved a resolution of 240 µm, a background limited NEP of 7.7×10−15W/√Hz and a NETD of 11 mK. We have measured temperature dependence of THz intesity emitted from a sample with the emissivity of 0.99. The result shows...
Achieving absolute power measurement is not so easy in the THz range. In this paper, we describe a simple method to perform power measurement no more expressed in a.u. but in Watt. For a 3.8 THz single-plasmon Quantum Cascade Laser, 28.8 mW peak power was measured with 12:1% relative uncertainty. The operating method described is not really a metrologic one but one that can be easily performed in...
We demonstrate the phase-locking of a 2.5 THz Quantum Cascade Laser (QCL) to an air-propagating, 6 octaves-spanning, THz Optical Frequency Comb Synthesizer (OFCS). We directly observe the beating signal using a commercial detector, therefore proving that this approach provides a mature metrological tool in the THz region. We show that only a small fraction (<100 nW) of the radiation emitted...
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