Abstract
In this article, we analyzed the influence of modulation frequency and duty cycle on the responsivity of Golay cell in terahertz (THz) measurement by establishing an energy transfer function. Experimental analysis shows that for the Golay cell we applied, when the heat absorption time is from 1.7 to 9 ms and the heat release time is longer than 30 ms in each cycle, the responsivity can be approximated as a constant. However, if the responsivity outside this region is regarded as a constant, it could bring uncertain errors for the result of measurement. Therefore, this result can provide a valuable guide for accurate measurement when measuring terahertz sources whose frequency and duty cycle are constantly changing, such as terahertz undulator super-radiation. Finally, we verified the region where the responsivity can be regarded as a constant by measuring the terahertz pulse of a home-built high repetition rate terahertz parametric amplifier (TPA).
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