Measurement and removal of cladding light in high power fiber systems

Walbaum T, Liem A, Schreiber T, Eberhardt R, Tuennermann A (2018)

Publication Type: Conference contribution

Publication year: 2018

Journal

Proceedings of SPIE Society of Photo-optical Instrumentation Engineers (SPIE)

Publisher: SPIE

Book Volume: 10513

Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering

Event location: San Francisco, CA, USA

ISBN: 9781510615113

DOI: 10.1117/12.2288266

Abstract

The amount of cladding light is important to ensure longevity of high power fiber components. However, it is usually measured either by adding a cladding light stripper (and thus permanently modifying the fiber) or by using a pinhole to only transmit the core light (ignoring that there may be cladding mode content in the core area). We present a novel noninvasive method to measure the cladding light content in double-clad fibers based on extrapolation from a cladding region of constant average intensity. The method can be extended to general multi-layer radially symmetric fibers, e.g. to evaluate light content in refractive index pedestal structures. To effectively remove cladding light in high power systems, cladding light strippers are used. We show that the stripping efficiency can be significantly improved by bending the fiber in such a device and present respective experimental data. Measurements were performed with respect to the numerical aperture as well, showing the dependency of the CLS efficiency on the NA of the cladding light and implying that efficiency data cannot reliably be given for a certain fiber in general without regard to the properties of the guided light.

Involved external institutions

Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering DE Germany (DE)

How to cite

APA:

Walbaum, T., Liem, A., Schreiber, T., Eberhardt, R., & Tuennermann, A. (2018). Measurement and removal of cladding light in high power fiber systems. In Paul O. Leisher, Alexei L. Glebov (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. San Francisco, CA, USA: SPIE.

MLA:

Walbaum, Till, et al. "Measurement and removal of cladding light in high power fiber systems." Proceedings of the Components and Packaging for Laser Systems IV 2018, San Francisco, CA, USA Ed. Paul O. Leisher, Alexei L. Glebov, SPIE, 2018.

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