A fiber-type terahertz time-domain spectrometer was developed by combining fiber femtosecond laser with fiber-coupled terahertz photoconductive antenna. And variable angle terahertz reflectance of high-resistance silicon wafer and composite absorbent material was measured using this spectrometer. The measurement results are in good agreement with the theoretical calculation results.
As a class of hollow core photonic bandgap fiber (HC-PBGF), hollow core Bragg fibers (HC-BFs) with broadband
transmission for multi-component trace-gas sensing have attracted much interest in recent years. In this paper, we
numerically investigate the PBG characteristics of HC-BFs with the conventional periodic cladding (CPC) and with our
previously proposed linearly-chirped cladding (LCC). The results show that the LCC structure is more suitable for
broadening the omnidirectional PBG (OPBG) range by regulating the linear increment of cladding period or the layer
number, which provide us with more degrees of freedom for designing a broadband HC-BF. Based on that, an optimized
Te/PS (tellurium/polystyrene)-based HC-BF with the LCC for the wavelength range of OPBG covering the whole range
of 3 to 5μm is designed. Moreover, by using the ray-optics method, the transmission loss of HE11 mode is also calculated,
verifying the feasibility of the Te/PS-based LCC with mid-infrared broadband low-loss transmission ranging from 3 to
5μm.
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