Guided-wave propagation of sub-ps terahertz (THz) pulses in a highly birefringent plastic photonic crystal fiber was studied by using a THz time domain spectroscopy technique. The plastic photonic crystal fiber was fabricated by using high density polyethylene tubes and solid filaments. The fabricated THz plastic photonic crystal fibers exhibit an extremely large birefringence of ~ 2.1 x 10(-2), which is almost one order of magnitude larger than that of previously reported photonic crystal fibers.
The authors show the prepulse effect on the conversion efficiency of a visible laser into water-window (λ=2.3–4.4nm) x ray from a liquid nitrogen jet. It is observed that a prepulse of only 2mJ enhances the conversion efficiency by 10–15 times for the main pulse of 15–60mJ at a delay of 3–6ns. The photon flux is ∼1.2×1012photons∕pulsesr at a delay of 4ns for a main pulse of 60mJ with a prepulse of 4–8mJ. It is noticed that the conversion efficiency increases with the delay up to 3ns and is then saturated.
Guided-wave single-mode propagation of terahertz pulses in plastic photonic crystal fibers has been experimentally demonstrated for the first time. Low loss propagation has been observed within the experimental bandwidth of 0.1 -3 THz.
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