Coherent thulium-doped double clad fibers utilize glass compositions specifically optimized for high cross-relaxation rates between Tm ions, enabling efficient conversion of 793 nm pump photons into signal photons at 2 µm. The precision matched -M fiber version offers higher absorption and efficiency than the -HE version. The waveguide design in the -M version is tailored for single-mode operation in monolithic fiber laser/amplifier systems when spliced to precision-matched passive fibers. These fibers, along with matching passive fibers, are available in a 130 µm cladding diameter for ease of handling, cleaving, and splicing, enabling reliable manufacturing of low-power, eye-safe fiber lasers and amplifiers.
Parameter | SM-TDF-10P/130-M |
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Optical Specifications | |
Operating Wavelength | 1900 - 2100 nm |
Core NA | 0.15 |
Cutoff | 1825 ± 75 nm |
Cladding Absorption | 1.50 ± 0.30 dB/m at 1180 nm 1.50 ± 0.30 dB/m at 1180 nm 9.00 dB/m at 793 nm |
Cladding Attenuation | ≤ 15.0 dB/km @ 860 nm |
First Cladding NA | ≥ 0.46 |
Geometrical & Mechanical Specifications | |
Cladding Diameter | 130.0 ± 1.5 µm 130.0 ± 1.5 μm |
Coating Material | Low Index Acrylate |
Core Diameter | 10.0 μm |
Coating Diameter | 215.0 ± 10.0 μm |
Core/Clad Offset | ≤ 1.00 μm |
Coating Concentricity | < 5.0 μm |
Prooftest Level | ≥ 100 kpsi (0.7 GN/m²) |