IRF-S Series Chalcogenide Nonlinear Mid-Infrared Fiber

IRflex's nonlinear mid-infrared fiber (IRF), made from extra high purity chalcogenide glass, is specially designed and manufactured to generate and/or guide mid-wave infrared (MWIR) wavelengths (2-10 µm).  They are commercially available.

A suite of patents relating to chalcogenide glass based fiber optics has been licensed to IRflex from the U.S. Naval Research Laboratory (NRL).  These patent, in conjunction with IRflex’s experienced team, enable IRflex to find cutting-edge solutions to nonlinear mid-infrared applications.

Chalcogenide glass is made from a mixture of the chalcogenide elements: sulfur, selenium and tellurium.  Due to its promising properties such as transmission in middle and far infrared regions of spectra, lower values of phonon energies, higher values of refractive indices and very large nonlinearities as compared to silica, chalcogenide glass fibers are the ideal candidates for mid-infrared applications which required for high power laser delivery, chemical sensing, thermal imaging and temperature monitoring.

IRF-S Series nonlinear mid-infrared fiber, made from extra high purity chalcogenide glass As2S3, is specially designed, and manufactured to generate and/or guide mid-infrared wavelengths from 1.5 to 6.5 µm with high transmission efficiency and nonlinearities about 100 times that of silica glass fiber.

IRF-S-100 and IRF-S-200 multimode fibers have typical optical loss of 0.05dB@2.8 and 0.08dB@4.8 µm, which are the lowest lost in the market. The IRF-S-100 fiber was initially designed to use in high-power infrared countermeasure (IRCM) lasers for missile defense.

IRF-S-5, IRF-S-7 and IRF-S-9 singlemode fibers have transmission range from 1.5-6 µm and minimum transmission loss of approximately 0.1dB/m at 4.8 micron.  Given their approximately 5, 7 and 9 µm core diameters and 0.3 numerical aperture, the step-index fibers are truly single-mode for wavelengths larger than their 1.988, 2.930 and 3.560 µm cutoffs.  For wavelengths shorter than the cutoffs and with proper coupling, the transmitted beam could remain single-mode (or slightly multimode) over short lengths of fiber (< 2 m) for their entire fiber transmission range.

IRF-S-50 multimode fiber is developed to use for the fabrication of mid-infrared combiners.  The 50/85 micron core/clad design is ideal for making 7x1 fiber combiners having our IRF-S-100 as the output fiber.

 

BENEFITS

  • Extra low loss
  • High power handling strength
  • High mechanical flexibility
  • Reliability and reproducibility

APPLICATIONS

  • Mid-IR Laser beam delivery
  • IR spectroscopy
  • Chemical sensing
  • Scientific and medical diagnostics IR-imaging system
  • Nonlinear supercontinuum generation
  • Infrared counter measure (IRCM)

 

 

IRF-S Series

Fiber Models

Core

Diameter (μm)

Cladding

Diameter (μm)

Operating

Wavelength (μm)

IRF-S-5

5

100

1.5 - 3

IRF-S-6.5

6.5

125

1.5 - 4.15

IRF-S-7

7

140

1.5 - 4.4

IRF-S-9

9

170

1.5 - 5.3

IRF-S-50

50

85

1.5 – 6.5

IRF-S-100

100

170

1.5 – 6.5

IRF-S-200

200

250

1.5– 6.5

 

 

Specifications: 

Transmission Range (µm)

1.5 to 6.5

Typical Optical Loss (dB/m)

0.05 @ 2.8 (µm)

Core/Clad Structure

As2S3glass

Core Refractive Index

2.4

Effective Numerical Aperture (NA)

0.28 - 0.30

Core Non-Circularity (%)

<1

Core/Clad Concentricity Error (µm)

<3

Tensile Proof Test (kpsi)

>15