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THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m

100%

Walczakowski M., Palka N., Czerwiński A., Sypek M., Szustakowski M.

Acta Physica Polonica A

2015

vol. 127

issue 3

689-692

This work presents a terahertz system designed for the reflection spectroscopy of different materials located at a distance up to 5 m. The source of the radiation is a tunable solid-state optical parametric oscillator, which generates a narrow-band nanosecond pulses in the range of 0.7-2.5 THz. The signal is detected with relatively fast and having big sensitivity hot electron bolometer. The detailed description of each device and the functioning of the experimental setup are provided as well as the methodology of the measurement is explained. Investigations were performed in the 0.7-2.2 THz range in free space with relative humidity of about 40%. The experiment was divided into three series, each of which was carried out with different distance between the examined sample and the system - 1 m, 3 m, and 5 m. Obtained spectra of selected materials, including explosives, are similar to the results received from a purged time domain spectroscopy system. The observed small deviations are connected with fluctuations of the laser wavelength and the instability of the bolometer.

Transmission Spectra of Materials in the Terahertz Range Measured by a Hot Electron Bolometer-Based System

86%

Pałka N., Walczakowski M., Zagrajek P., Czerwiński A., Sypek M., Szustakowski M.

Acta Physica Polonica A

2013

vol. 124

issue 3

538-541

This paper presents an optical system for transmission spectral measurements in the terahertz range. The source of radiation is a tunable solid-state laser, which generates a narrow-band nanosecond pulses in the range 0.67-2.68 THz and based on optical parametric oscillator phenomenon. The signal is detected with a fast and sensitive hot electron bolometer. Principle of generation and detection of pulses as well as methodology of measuring spectral characteristics are presented. We compared the results obtained with the free-space setup, which is based on the optical parametric oscillator and hot electron bolometer, with a purged time domain spectroscopy system in the range of 0.7-2.2 THz.

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2 Acta Physica Polonica A

1 2015

1 2013

2 Czerwiński A.

2 Sypek M.

2 Szustakowski M.

2 Walczakowski M.

1 Palka N.

1 Pałka N.

1 Zagrajek P.

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THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m

Transmission Spectra of Materials in the Terahertz Range Measured by a Hot Electron Bolometer-Based System