Semiconductor and Fiber Lasers

LIEKKI Introduces High-Efficiency, Large Mode Area (LMA) Erbium Fiber Family

Lohja, Finland  May 18, 2006 – LIEKKI, a leading supplier of highly doped optical fibers, has developed a new large mode area erbium double clad fiber.

LIEKKI blazes new ground with a highly-doped erbium double clad (Er-DC), large mode area (LMA) fiber, LIEKKI™ Er60-20/125DC. This fiber features high erbium concentration for efficient absorption, large 20 μm core with low NA of 0.07 supporting good beam quality, and 125 μm octagonal-shaped cladding for ease of use. The fiber demonstrates >30% slope efficiency with 980 nm pumping with efficient lasing bandwidth extending up to 1.6 μm.

Mikko Söderlund, Fiber Product Manager, says “LIEKKI™ Er60-20/125DC clearly demonstrates the capabilities and quality of the DND technology – this fiber features high concentration, large core/clad ratio, low clustering and low background losses, a combination which is unreachable with conventional processes. It opens up completely new possibilites in the eye-safe wavelength region. We are excited about this first release of the Er-DC product family and look forward to further leverage and develop this core platform into other core/clad ratios and variants like polarization maintaining and all-glass fibers, following our customer’s requirements”.

LIEKKI™ Er60-20/125DC opens many applications in the 1.5 - 1.6 μm region

  • Eye-safe fiber lasers and amplifiers
  • Military and commercial lidar
  • Single frequency fiber lasers
  • High peak power amplifiers
  • Ultra-short pulse amplifiers
  • Industrial machining
  • Medical imaging

The direct Er-doping approach avoids some of the commonly known trade-off’s of Er:Yb co-doped fibers like poor/unrepeatable efficiency, high core NA and spurious lasing at 1 μm. The fiber can be pumped either with 980 nm or 1480 nm. LIEKKI also provides 6 x 1:1 pump combiner for this fiber.

Product Family:
About Investors Careers nConnect
Semiconductor Lasers Fiber Lasers Corona Fiber Lasers Directed Energy Lasers Optical Fibers
Material Processing Consumer Medical Defense
Press Releases Events Technical Papers Articles
Benefits Open Positions
Contact Us Locations