LIEKKI®

Product catalog summary

Overview
LIEKKI® passive fibers are designed to match the optical guiding properties of LIEKKI® large mode area Ytterbium doped fibers, ensuring optimal mode coupling and minimal splice loss. These fibers are available in various configurations, including single cladding, double cladding, and polarization maintaining versions.

Specifications
- Core, cladding, and coating diameters are specified in micrometers (μm).
- Core Numerical Aperture (NA) and cladding NA are provided, with cladding NA being ≥0.48 for double cladding fibers.
- Proof test levels are specified in kpsi.
- Core diameter specification refers to the far-field mode field diameter at 1060 nm.

Features
- realNA provides accurate fiber core NA for superior predictability and minimal splice loss.
- Fibers are designed to match industry-standard active fiber geometries (125, 250, 400 μm).
- Low signal and pump coupling losses from passive to active fiber.
- Single cladding fibers have a dual-coated high-index acrylate coating.
- Double cladding fibers feature a low-index fluoroacrylate coating, operational up to 120˚C and in extreme humidity.
- Fiber Bragg Gratings can be written into all large mode area passive fibers.

Applications
- Pigtails for fiber lasers and amplifiers.
- All-fiber subassemblies.
- High brightness power delivery.
- Fiber-based components for fiber lasers, such as pump combiners and FBGs.

Typical Fiber Configurations
- Passive fibers are available in various core sizes (e.g., 6/125, 10/125, 12/125, 20/125, 25/250, 30/250) with corresponding cladding and coating specifications.
- Each configuration is matched with specific active fibers, such as Yb1200-6/125DC or Yb1200-20/400DC.
- Polarization maintaining (PM) versions are available for certain configurations.

Conclusion
LIEKKI® passive fibers offer a range of configurations and features designed to optimize performance in fiber laser and amplifier applications, ensuring high-quality power delivery and minimal losses.

Catalog excerpts

Large Mode Area Passive Fibers LIEKKI® passive fibers are especially designed and manufactured to match the optical guiding properties of LIEKKI ® large mode area Ytterbium doped fibers. This enables optimal mode coupling with minimal splice loss for maintaining the power and excellent beam quality between all elements of a fiber laser or amplifier. High-quality Fiber Bragg Gratings can be written into all LIEKKI® passive fibers. LIEKKI® passive fibers are available in single cladding, double cladding (DC), single cladding polarization maintaining (PM) and double cladding polarization maintaining configurations. • realNA — most accurate fiber core NA to enable superior predictability of fiber performance and minimal splice loss • Pigtails for fiber lasers and amplifiers • Matching with industry standard active fiber geometries 125, 250, 400 μm • All-fiber subassemblies • Glass cladding diameter is designed to “fit-in” octagonal active fibers • High brightness power delivery • Low signal and pump coupling losses from passive to active fiber • Fiber based components for fiber lasers (e.g. pump combiners; FBGs) • Single cladding fibers feature a dual coated high-index acrylate coating • Double cladding fibers feature a NA ≥0.48 low-index fluoroacrylate coating, which is proven to operate up to 120˚C and in extreme humidity. • Fiber Bragg Gratings can be written into all large mode area passive fibers

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Large Mode Area Passive Fibers Core, cladding and coating diameters specified in m. realNA 3 Proof test level specified in kpsi. 4 Core diameter specification refers to the far-field mode field diameter at 1060 nm. 2 Matching Active Fiber

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LIEKKI®

LIEKKI®

Catalog excerpts

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