Abstract
We propose a fiber-based, terahertz-comb-referenced spectrum analyzer which has the advantages of being a portable, alignment-free, robust, and flexible apparatus suitable for practical use. To this end, we constructed a 1550-nm mode-locked Er-doped fiber laser whose mode-locked frequency was stabilized precisely by referring to a rubidium frequency standard, and used it to generate a highly stable terahertz (THz) frequency comb in a photoconductive antenna or an electro-optic crystal. By standardizing the THz comb, we determined the frequency accuracy of an active-frequency-multiplier-chain (AFMC) source to be 2.4 x 10(-11). Furthermore, the potential of the THz spectrum analyzer was effectively demonstrated by real-time monitoring of the spectral behavior of the AFMC source and a photomixing source of two free-running CW lasers at adjacent wavelengths.
Highlights
A spectrum analyzer is a fundamental frequency measurement instrument widely used for radio-frequency wave, microwave, and millimeter wave
We propose a fiber-based, terahertz-comb-referenced spectrum analyzer which has the advantages of being a portable, alignment-free, robust, and flexible apparatus suitable for practical use
The potential of the THz spectrum analyzer was effectively demonstrated by real-time monitoring of the spectral behavior of the AFMC source and a photomixing source of two free-running CW lasers at adjacent wavelengths
Summary
A spectrum analyzer is a fundamental frequency measurement instrument widely used for radio-frequency wave, microwave, and millimeter wave. New types of spectrum analyzers using a mode-locked Ti:Sapphire laser have been proposed and developed which can measure the absolute frequency and spectral shape of continuous-wave (CW) THz radiation without the need for cooling. One such device is a THz-comb-referenced spectrum analyzer [1] using a frequency comb of photocarriers (PC-THz comb) generated in a photoconductive antenna (PCA) [2]. A second type of spectrum analyzer is based on a non-synchronized electro-optic sampling technique using a free-running Ti:Sapphire laser, and has been applied to frequency measurements of a CW CO2 laser at 28 THz [3]
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