Abstract
We constructed optical-fiber-based THz time-domain spectrometers (THz TDSs) with standard single-mode fibers (SSMFs) and large-mode-area photonic crystal fibers (LMA PCFs) and compared those to THz waves and spectra. The optical fibers are used for guiding optical pulses from ultra-fast lasers to a THz emitter and detector. The LMA-PCF-based THz TDS exhibits increased bandwidth from 1 to 2 THz and increased field amplitude by a factor of four compared with the SSMF-based THz TDS under the relatively higher excitation power of ultra-fast lasers. This improvement results from LMA PCFs that are suitable for high-power transmission without introducing nonlinear effects. We also fabricated compact THz emitter and detector module heads, which are connected with LMA PCFs. The LMA-PCF-based THz TDS had THz radiation power and bandwidth comparable with those obtained by a conventional THz TDS with a free-space optical arrangement.
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PACS
42.72.Ai; 42.65.-k; 42.81.DP
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Lee, Y., Tanaka, S., Uetake, N. et al. Terahertz time-domain spectrometer with module heads coupled to photonic crystal fiber. Appl. Phys. B 87, 405–409 (2007). https://doi.org/10.1007/s00340-007-2609-7
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DOI: https://doi.org/10.1007/s00340-007-2609-7