Photonic crystalline IR fibers for the spectral range of 2–40 μm

Abstract

Monocrystals of Ag(1-x)Tl(x)Br(1-x)I(x) and Ag(1-x)Tl(x)Cl(y)I(z)Br(1-y-z) for the spectral range from 2.0 to 40.0 μm with improved photostability were developed and grown. The grown crystals were used for fabrication of single-mode IR fibers. Experimental studies of optical properties of these fibers have confirmed their single-mode operation at CO2 laser wavelength and demonstrated wider mode field for microstructured fiber compared to fibers with conventional double-layered structure.

Development of IR Single Mode Optical Fibers for DARWIN-nulling Interferometry

“…Modal filters like single mode fibers are the preferred solution since they can filter both low and high spatial frequencies (Bracewell, 1978); (Angel, 1978). Potential technologies for the development of single mode fibers either using Step Index Fibers (SIF's) or Index Guiding Photonic Crystal Fibers (IG-PCF's) have been studied (Cheng, 2005) (Zhukova, 2012) (Spronck, 2012). This article describes the results on the development of Single Mode Waveguides (SMW's) based on SIF's, typically made of a solid material core and cladding having slightly different refractive indices (n).…”

Crystals based on solid solution of Ag1?xTlxBr1?xIx for the manufacturing of IR fibers

“…The former are represented mainly by the AgCl-AgBr system, which the flexible IR fibers are extruded from, and they are the only nontoxic polycrystalline fibers that can operate from 2.0 up to 30.0 μm [2][3][4][5] . They have found their applications in IR spectroscopy, laser diagnostic and endoscopic medicine, and laser cutting and welding, as well as in low-temperature pyrometry for night-vision fiber-optical system manufacturing [6][7][8] . However, the application is constrained by their light sensitivity, which leads directly to the deterioration of the optical properties and affects the diffusion at the core-cladding interface when extruding double-layer fibers.…”