Chalcogenide Infra Red (CIR) glasses are the best As2S3-based material for fiber optics in the range of 1.5-6μm. CIR fibers transmit IR-radiation in the gap between silica fibers (0.2-2.4μm) and Polycrystalline Infra Red (PIR) fibers (4-18μm). CIR fiber is drawn in core/clad structure with double polymer coating and characterized by a low optical losses and high flexibility.
The innovative glass purification process provides the attenuation spectra free from OH absorption band at 3μm and thus it enables CIR fiber to be used for Er:YAG laser power delivery.
|Transmission Range||1.5 - 6μm|
|Core Refractive Index||2.4|
|Protective Coating||Double Polymer Jacket|
|Ambient Temperature Range||270 - 370 K|
Chalcogenide Infra Red (CIR) (1.5 - 6μm) fiber is drawn in core/clad structure with double polymer coating and characterized by a low optical losses and high flexibility. Delivery is from stock or within few weeks ARO. All standard cables include PEEK-polymer protective jacket and SMA termination.
Polycrystalline Infra Red Fibers (PIR – Fibers)
The development of specialty fibers for the Mid-Infrared region has resulted in a unique product - Core/Clad Polycrystalline Infra-Red (PIR-) fibers. The PIR-fibers are non-toxic, very flexible, transparent across a broad spectral region4 -18μm and capable of operating over the wide temperature range of 4K up to 420K. They are manufactured in a core/clad structure of superior quality from pure AgCl: AgBr solid solution crystals using an innovative vacuum extrusion method. They possess by no aging effect compared to an alternative bare core fiber. The range of PIR-fiber cables are available with a durable PEEK polymer jacket and terminations using either an SMA - type connector with a Ti or polymer ferrule or special one, manufactured on customer request. A wide variety of different optical coupling units can also be designed & fabricated for specialized customer requirements.
|Standard Fiber Core/Clad Diameters Other fiber diameters in 0.3-1.5mm range are also available (request on special fabrication)||240/300, 400/500, 630/700, 900/1000μm|
|Attenuation at 10.6μm||0.1-0.5 dB/m|
|Standard Effective NA||0.25|
|Laser Damage Threshold for CW CO2-laser||>12 kW/cm2|
|Tensile strength||>100 MPa|
|Minimum Bending Radius (fixed)||10x[Fiber Diameter]|
|Minimum Elastic Bending Radius||100x[Fiber Diameter]|
PIR-fibers are protected by a loose PEEK-jacket (PolyEtherEtherKetone) to provide stiff, flexible and hermetic protection against mechanical, photoinduced and chemical damage over a wide temperature range up to 250°C.
Diverse Methods of AR-coating and SMART-treatment
Comparison of Standard and Spectral PIR-fibers
Comparison of CIR- and PIR-Fibers
Typical transmission spectra of 1.5m long PIR-900/1000 fiber (red) versus CIR-750/850 fiber (blue) (includes reflection & coupling losses at fiber ends without AR coating and some absorption bands of atmospheric moisture, etc.)
Typical specification of CIR- and PIR-fibers
|1||Transmission range||1.5 to 6μm or 1600- 6500cm-1||3 to 18μm or 550 - 3300cm-1|
|2.||Core/Clad structure materials||Chalcogenide As-S glasses||AgCl:AgBr solid solution crystals|
|3.||Specific Features||Toxic & Fragile, Non-hygroscopic||Non-toxic, Non-hygroscopic, very flexible, slightly UV-sensitive|
|4.||Core/Clad diameter||200-500/300-600μm||400/500, 630/700, 700x700, 900/1000μm|
|5.||Core refractive index||2,4||2,2|
|7.||Optical losses||Minimum of 0,2dB/m at wavelengths 2-4μm||Minimum of 0,2-0,3dB/m at wavelengths 10-12μm|
|8.||Operation temperature||From 270 to 370K||From 4 to 420K|
|9.||Max length of cable||Up to 50-100 meters||Up to 20-40 meters|
Comparison of PIR- and CIR-Fibers Transmission Spectra for 1.5m length