IRflex research team has developed and produced an innovative mid-infrared polarization-maintaining photonic crystal fiber (PM-PCF) with complex asymmetric orthogonal patterns of longitudinal holes with different periods and diameters to create high birefringence (~10-4). The PM-PCF is made of chalcogenide glass and offers endlessly single mode in the mid-infrared (2-6 micron) with good circular beam quality (M2~1) and low loss (<0.2dB/m).
IRflex will present the latest results on the new mid-infrared PM-PCF prototype at the coming SPIE Photonics West 2022. Mid-infrared chalcogenide polarization-maintaining single-mode fiber
A United State Patent Application has been published on December 30, 2021 for our PM-PCF fiber, Pub No.: US 2021/0405287 A1.
On January 29, 2021, IRflex Corporation signed a Phase II contract with the Department of Defense after completion of the Phase I project of the same title to develop an anti-reflective surface for infrared Optical fiber Endfaces.
The objective of the project is to develop an anti-reflective surface for use on bare and connectorized infrared fiber optic cable assembly in the wavelength interests of 1.4 to 5 micron. In such region, optical materials with a large index of refraction are often used. According to the Fresnel equation, reflection loss increases significantly when the difference between the index of the exit medium and the index of the entrance medium is 1 or greater. In addition to the need for low reflectivity, anti-reflective surfaces must be tolerant to high optical power.
The project requests that the anti-reflective surface should be realizable on non-silica optical fiber including indium fluoride, chalcogenide, tellurite, and ZBLAN. Fiber optic cables should be designed to assemble with Subminiature Version A (SMA) 905 connectors and be compatible with short and mid-wave laser sources for the wavelength interest region of 1.5 to 5 micron. The fiber optic cable assembly must pass thermal, vibration, and humidity environmental testing. The end result of this project is an anti-reflective surface with an improved damage threshold for high power application that can be manufactured.
The project started on February 1, 2021 and will last for the next two years.