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The problem of degraded emissivity of thin films at low temperatures has been a long observed phenomena. Previous efforts at measuring properties have suggested that transmission of energy through the films may play a key role in the thermal performance of multilayer insulation systems at low temperatures. Similarly, recent testing on tank applied systems has suggested a radiative degradation at low...
We present a coherent, continuous-wave terahertz materials characterization platform enabling THz spectroscopy and characterization of chemical, electronic and magnetic samples from 5 K to 300 K and in fields up to 9 T.
We report on the development and testing of fiber-coupled, LT-GaAs photomixers operating at cryogenic temperatures which are designed for variable temperature terahertz spectroscopy of chemical, electronic and magnetic materials.
A compact terahertz frequency domain spectrometer realized through photo-mixing of two distributed feedback (DFB) diode lasers in ErAs:GaAs is shown to have a signal-to-noise ratio of 80 dB*Hz at 200 GHz and 60 dB*Hz at 1 THz. Continuous frequency sweeping is demonstrated with better than 1 GHz resolution from 200 GHz to 1.85 THz. The system is employed for the characterization of several explosives.
We investigate single-crystal, ferroelectric LiNbO3 as a polarization transformer in the region 400 GHz to 1.0 THz, and extract the THz birefringence and attenuation coefficient from high-resolution photomixer spectrometer data. We also report narrow absorption resonances whose frequency is practically independent of sample thickness and whose strength decreases between 400 GHz and 1.0 THz. These...
A terahertz frequency domain spectrometer is implemented using two ErAs:GaAs photomixers in a highly compact configuration, utilizing all solid-state components and no moving parts. The system utilizes a single package integration of two 783 nm distributed feedback laser diodes with a high-resolution wavelength discriminator. Digital signal processing electronics provide precise frequency control...
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