Silicon wafer Air gap etalon 

Two types of calibration kit are on offer: Etalons and gas cells.

Etalons

• Uniformly-spaced peaks and troughs covering the whole of the available band
• Well-defined spectral profile
• Frequency spacing as required
• Small, light and convenient to use
• Low frequency resolution (~5 GHz)

Silicon wafer etalon

A high-resistivity silicon wafer.

Air gap etalon

Two silicon plates separated by a spacer.

THz transmission spectrum through a silicon wafer etalon 

Carbon monoxide gas cells

Gas cells

• Gas-tight cells with PTFE windows filled with carbon monoxide gas; available in a range of sizes
• Uniformly spaced peaks in the range 0.5-2.5 THz
• High frequency resolution (<1 GHz)
• Variable peak intensity

Terahertz transmission spectrum of a CO cell at 2 bar pressure 

Publications

M Naftaly, R A Dudley, J R Fletcher, F Bernard, C Thomson, Z Tian, Frequency Calibration of Terahertz Time-Domain Spectrometers J. Opt. Soc. Am. B, Vol. 26 (7), 2009, pp. 1357-1362.

Contact

E-mail: terahertz@npl.co.uk