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A hardware-software complex for measuring the frequency and the spectrum of single or low-repetition rate pulses of THz-radiation

Keywords:

M.Yu. Glyavin – Head of Laboratory, Institute of Applied Physics of RAS (N. Novgorod) E-mail: glyavin@appl.sci-nnov.ru M.B. Goikhman – Junior Research Scientist, Institute of Applied Physics of RAS (N. Novgorod) E-mail: goihman@appl.sci-nnov.ru A.V. Gromov – Junior Research Scientist, Institute of Applied Physics of RAS (N. Novgorod) E-mail: gromov@appl.sci-nnov.ru A.V. Palitsin – Ph. D. (Phys.-Math.), Research Scientist, Institute of Applied Physics of RAS (N. Novgorod) E-mail: pal@appl.sci-nnov.ru A.N. Panin – Leading Engineer, Institute for Physics of Microstructures of RAS (Nizhny Novgorod region) E-mail: panin@ipmras.ru Yu.V. Rodin – Leading Engineer, Institute of Applied Physics of RAS (N. Novgorod) E-mail: wish26@yandex.ru S.E. Filchenkov – Ph. D. (Phys.-Math.), Research Scientist, Institute of Applied Physics of RAS (N. Novgorod) E-mail: fil@appl.sci-nnov.ru


This paper describes a hardware-software complex for measuring the frequency and the spectrum of terahertz (THz) radiation. The complex is capable of processing low-repetition rate pulses with short spikes or quick hops of the carrier frequency. Results of simula-tions show that the complex can measure the carrier frequency and the spectrum of such pulses even if the amplitudes of the spikes amount to 10 GHz and the durations of the spikes are of the order of a few nanoseconds. It is important to point out that at present there is no standard instrumentation for measuring the spectrum of such pulses especially in the cases where the spike of the frequency exceeds GHz and the spike duration is only a few nanoseconds. The complex consists of hardware and software parts. The hardware part of the complex is composed of channels that measure the amplitude of the initial pulse as well as the amplitudes of the pulses transmitted via waveguide high-pass filters (HPFs) with different cutoff frequencies. The software part is based on an amplitude-frequency algorithm which uses the measured amplitudes to restore the frequency and the spectrum of the THz radiation. Special waveguide HPFs with cutoff frequencies exceeding the known analogs were developed and their characteristics were used to simulate the complex. In our opinion, the existing manufacture techniques allow developing waveguide HPFs with cutoff frequencies of up to 1.1 THz. The use of other filter designs, e.g., quasioptical filters, will make it possible to use the complex for measuring the spectrum at higher frequencies. The complex can be useful for measuring the spectrum of the output radiation in high-power pulse gyrotrons, as well as in the other terahertz sources, e.g., in quantum-cascade lasers, where fast frequency modulation in a wide range is possible, or in free electron lasers.
References:

 

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