We report on measurements of transmission spectra of chosen materials (Hexogen, sugar, L-tartaric acid, 4-aminobenzoic acid) in the range 0.7-2.0 THz. The measurements were carried out by means of a setup, which bases on the optical parametric oscillator (OPO) combined with the hot electron bolometer (HEB). The setup consists of the commercially available tunable OPO working in the range 0.7-2.0 THz with repetition rate 53 Hz, duration of the impulse of about 20ns and energy 10nJ. The beam was detected by the fast and sensitive HEB. The spectra were compared to results obtained from a standard time domain spectroscopy (TDS) setup. Only small discrepancies between spectra measured by both methods are observed. For the range 0.7-2.0 THz typical features can be identified using both methods. Above 2 THz the TDS setup seems to have better performance in terms of signal-to-noise ratio and sensitivity. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

 Topics
Bolometers ; Electrons ; Optical parametric oscillators ; Signal to noise ratio ; Spectroscopy ; Terahertz radiation

Citation
Michał J. Walczakowski ; Norbert Palka ; Przemyslaw Zagrajek and Mieczyslaw Szustakowski" Terahertz spectra of materials measured by the OPO-based system ", Proc. SPIE 8716, Terahertz Physics, Devices, and Systems VII: Advanced Applications in Industry and Defense, 87160Y (May 31, 2013); doi:10.1117/12.2015375;http://dx.doi.org/10.1117/12.2015375

 The TPS Spectra 3000 was used in this study