Optimized Fiber is suited for high-energy amplification.
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Press Release Summary:
Suited for amplifying pulses from 1 µm lasers with durations from nanoseconds to femtoseconds, Yb1200-20/125DC ytterbium-doped, large-mode-area fiber has 20 µm diameter core and octagonal cladding shape. Cladding pump absorption from 6.8 dB/m @ 920 nm to 29 dB/m near peak @ 976 nm enables use of active fiber lengths down to few 10's of centimeters for 976 nm pumping. Fiber has 125 µm cladding diameter and is used for access to wavelengths from IR to UV.
Original Press Release:
Liekki Introduces Optimized Fiber for High-Energy Amplification
LOHJA, October 14, 2005 - Liekki, the leading supplier of highly doped optical fibers, has developed an ideal fiber for amplifying pulses from 1 µm lasers.
Liekki expands its broad, ytterbium-doped fiber product family with a highly doped, large-mode-area fiber with very high cladding absorption (Yb1200-20/125DC). Typically this fiber is used in lasers for applications in materials processing (cutting, marking, drilling), targeting and range finding, remote chemical detection, and nonlinear frequency conversion for access to wavelengths from the infrared to the ultraviolet. These applications require pulsed amplifiers with mJ output energies and diffraction-limited beam quality, specifications that have previously been unattainable with fiber-based laser systems. Development of a fiber with a large-mode-area and short active fiber length provided the breakthrough required to minimize nonlinear effects, the key limitation on the achievable output energy from conventional fiber amplifiers. "Overcoming this limitation will substantially increase the range of applications that can be addressed by fiber lasers," according to Mr. Mikko Saderlund, Product Manager of Liekki's fiber products.
"This highly doped ytterbium fiber with its extremely high pump absorption, high power conversion efficiency, and large-mode-area is excellent for amplification of pulses with durations ranging from nanoseconds to femtoseconds. Such high-power pulses are typically used in material processing and micromachining", continues Mr. Saderlund. The Yb1200-20/125DC fiber features a unique combination of a highly doped, 20 µm diameter core, a large core-to-cladding ratio, and an efficient octagonal cladding shape. These features result in a cladding pump absorption of 6.8dB/m at 920nm and up to 29dB/m pump absorption near the peak at 976nm, enabling use of very short active fiber lengths (few 10's of centimeters for 976nm pumping). Applications using this fiber benefit from high extractable energy and excellent beam quality. The use of standard 125 µm cladding diameter is another advantage, broadening the fiber's usability, for example, with standard telecom fiber stripping, splicing, and connectorization equipment.
Liekki supplies a passive fiber matched to the active ytterbium fiber, so that excellent beam quality is maintained throughout the monolithic fiber laser or amplifier assembly. Combiners, such as 6+1/1 based on tapered fiber bundle technology are also available through Liekki. "This approach is part of our mission to provide complete solutions to our customers", concludes Mr. William Willson, Liekki's Vice President Marketing and Sales.
About Liekki Corporation
Liekki designs, manufactures and markets specialty optical fibers and fiber subassemblies (optical engines) for fiber amplifiers and lasers using its unique and proprietary Direct Nanoparticle Deposition (DND) technology. DND makes it possible to produce state-of-the-art highly doped fibers that minimize required fiber length, have large core-to-clad ratios, and exhibit low photodarkening, flat refractive index profile, high efficiency and reduced nonlinear effects. Liekki fibers also have very good usability in terms of splicing properties, temperature and bending characteristics. Liekki products are used in applications such as high power fiber lasers for industrial manufacturing, military and aerospace, medical applications, telecom amplifiers and ASE light sources.
Direct Nanoparticle Deposition (DND) is a new, innovative nanoparticle process invented, developed and commercialized by Liekki, for a wide range of industrial applications. Liekki has licensed DND to industrial customers for non-optical applications and will continue to do so.
Liekki is headquartered in Lohja, Finland. Liekki products are available globally through Thorlabs (www.thorlabs.com). Liekki direct sales serves North America, Europe and Asia, supported by our representatives FT Okura (Japan), IKG Corporation (Japan), Apollo Electronics Co. Ltd. (China), Connet Fiber Optics Company Ltd. (China) and Chon Sun Engineering Co. Ltd. (Korea). For further information, please visit our website at www.liekki.com.
For more information, please contact:
Liekki
· Mr. William Willson, Vice President Marketing and Sales, tel. +1 301 706 0315, email william.willson@liekki.com, or
· Ms. Minna Salander, Marketing and PR, tel. +358 19 357 391, email minna.salander@liekki.com
Liekki Corporation, Sorronrinne 9, 08500 Lohja, Finland
www.liekki.com
Tel +358 19 357 391
Fax +358 19 357 3949
E-mail: liekki@liekki.com
