ASQR/SSQR Square Core MM Fibers

Multi Mode, Square Core; 190 to 2400 nm; Core Size 100 to 1000 µm; Coating Acrylate, Nylon, Polyimide; Numerical Aperture 0.22

Fiberguide’s Anhydroguide™ (ASQR) and Superguide™ (SSQR) series of square silica core, doped round cladding multi mode optical fibers excel in specific applications where traditional circular core fibers with Gaussian outputs are not ideal. The uniform “top hat” intensity profile these fibers provide are the desired output profile when performing tasks such as welding, photolithography, and spectroscopy.

Square core fibers with round claddings are also excellent candidates for use in the laser diode industry, where the square shape enables a more ideal coupling match with the diode source. Fiberguide offers pure silica square core fibers with a fluorine doped cladding (0.22 NA) in a wide range of core diameters from 100 μm to 1000 μm.

While the ASQR series features a low hydroxyl ion concentration (low OH) and works in the visible to IR range, SSQR variants with high hydroxyl ion concentration are suitable for the UV to visible range. Options include Acrylate, Polyimide and Nylon coatings as well as anti-reflective coatings like standard thin film coatings or RARe Motheye nano-surfacing. This anti-reflective technology enhances fiber transmission performance and significantly increases the damage threshold for your application over a large wavelength range.

Key Features:

• Homogenized Output Distribution
• Top Hat Beam Profile
• Greater Capture Area than Round Fibers for Square Inputs
• Step Index Multi Mode Fibers
• Square Silica Core / Doped Round Cladding
• Coatings: Acrylate, Nylon, Polyimide
• Core Sizes: 100 to 1000 µm
• Typical Clad/Core Ratio (RD Clad): 1.2 (Diagonal to Clad OD)
• Wavelengths: SSQR (High OH) 190 to 1250 nm, ASQR (Low OH) 300 to 2400 nm
• Numerical Aperture (NA): 0.22 ±0.02
• 100% Proof Test Using 4-Axis Bend Method

Applications: Laser Materials Processing; Astronomical Spectroscopy; Non-circular Diode Beam Coupling; Photolithography