13 March 2013 Fabrication and evaluation of a 500 W cladding-light stripper
Author Affiliations +
Abstract
Fiber lasers have reached kW levels of output power. To achieve this level it is necessary to use reliable high-power components that sustain these power levels. Double-clad fibers (DCFs) are often used in high-power fiber lasers. Cladding-light strippers (CLSs) are used to remove unwanted light from the inner cladding of the DCF. This unwanted light consists of residual pump light or signal light that leaked into the cladding, thus requiring that the CLS removes both high-NA (>0.4) and low-NA (<0.1) light. Often high-index polymers are used to remove the unwanted light from DCFs1,2,3. Because the CLS has to be able to withstand several 100W and most polymers are not capable of exceeding temperatures more than 200°C, we investigated a CLS without polymers, based on an etching process. We present results from a CLS that was tested up to 500W of stripped power. We determined the angle dependency of the stripping efficiency by launching both high- and low-NA light into the fiber and evaluating the NA attenuation. Furthermore, we measured the dependency of the stripping efficiency on the length of the etched area and the etching time. With optimized parameters an attenuation of more than 20 dB when launching high-NA light and 6 dB with low-NA light was achieved. The CLS did not show any degradation in terms of attenuation or thermal behavior in a six-hour stability test.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Kliner, Kai-Chung Hou, M. Plötner, Ch. Hupel, Th. Stelzner, T. Schreiber, R. Eberhardt, A. Tünnermann, "Fabrication and evaluation of a 500 W cladding-light stripper", Proc. SPIE 8616, MOEMS and Miniaturized Systems XII, 86160N (13 March 2013); doi: 10.1117/12.2001984; https://doi.org/10.1117/12.2001984
PROCEEDINGS
8 PAGES


SHARE
RELATED CONTENT

Excitation-dependent losses in plastic optical fibers
Proceedings of SPIE (February 09 1993)
High Strength, All-Silica Fibers For Adverse Environments
Proceedings of SPIE (April 26 1989)
Fluoride glass fiber for reliable Er YAG and Er,Cr YSGG...
Proceedings of SPIE (February 07 2008)
High-power PCF-based pump combiners
Proceedings of SPIE (February 21 2007)

Back to Top