Abstract
We constructed a widely and continuously tunable terahertz frequency synthesizer traceable to a hydrogen maser linked to coordinated universal time. Photomixing of two optical frequency synthesizers, linked to the hydrogen maser via dual optical frequency combs, gave this THz synthesizer frequency uncertainty of 10⁻¹². To demonstrate the potential of wide and continuous tunability in the THz synthesizer, we tuned its output frequency up to 50 GHz discretely and 1.26 GHz continuously in the F-band while maintaining the unprecedented frequency uncertainty by using a uni-traveling-carrier photodiode as a photomixer. This THz synthesizer will be a powerful tool for broadband, high-precision THz spectroscopy and THz frequency metrology.
Highlights
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We demonstrated a widely and continuously tunable THz synthesizer traceable to the hydrogen maser linked to UTC-NMIJ
We believe that it should be possible to further extend the tuning range to 990 GHz in the THz frequency region by use of a broadband photomixier, such as a PCA [3,18], because we have already achieved continuous tuning of 990 GHz in the tunable OFS. This THz synthesizer will be a powerful tool for broadband, high-precision THz spectroscopy, such as analysis of multiple chemical species in gas-phase spectroscopy [19]
Summary
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