Dual-Wavelength Erbium-Doped Fiber Laser to Generate Terahertz Radiation Using Photonic Crystal Fiber


We tend to demonstrate a widely tunable twin-wavelength erbium-doped fiber laser that used a 10-cm photonic crystal fiber as a Mach–Zehnder interferometer to filter out the switchable twin-wavelength signals thus as to come up with tunable continuous-wave (CW) terahertz (THz) radiation. Every single longitudinal mode wavelength might be independently tuned by using a tunable band-pass filter and polarization controller (PC). The wavelength fine-tuning was achieved via changes to the PC, and therefore the ensuing dual-wavelength output had a facet-mode suppression ratio (SMSR) of more than thirty dB. The wavelength spacing of seven, 11.4, and twenty one.two nm, love zero.nine, 1.four, and a couple of.66 THz radiation, respectively, was tuned in order to get CW THz radiation. This CW THz radiation was produced by means of a stable twin-wavelength fiber laser performing as the optical beat source, along with a DAST crystal-primarily based photomixer. High-sensitivity thermal sensors calibrated for THz radiation were ready to continuously detect the emitted CW THz radiation.

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