Gamma-radiation-induced photodarkening in actively pumped Yb[sup]3+[/sup]-doped optical fiber and investigation of post-irradiation transmittance recovery

B. P. Fox; K. Simmons-Potter; S. W. Moore; J. H. Fisher; D. C. Meister

doi:10.1117/12.828382

28 August 2009 Gamma-radiation-induced photodarkening in actively pumped Yb³⁺-doped optical fiber and investigation of post-irradiation transmittance recovery

B. P. Fox, K. Simmons-Potter, S. W. Moore, J. H. Fisher, D. C. Meister

Author Affiliations +

Proceedings Volume 7434, Optical Technologies for Arming, Safing, Fuzing, and Firing V; 74340C (2009) https://doi.org/10.1117/12.828382
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Fibers doped with rare-earth constituents such as Yb³⁺ and Er³⁺, as well as fibers co-doped with these species, form an essential part of many optical systems requiring amplification. This study consists of two separate investigations examining the effects of gamma-radiation-induced photodarkening on the behavior of rare-earth doped fibers. In one part of this study, a suite of previously irradiated rare-earth doped fibers was heated to an elevated temperature of 300°C and the transmittance monitored over an 8-hour period. Transmittance recoveries of ~10 - 20% were found for Er 3⁺- doped fiber, while recoveries of ~5 - 15% and ~20% were found for Yb³⁺- and Yb³⁺/Er³⁺ co-doped fibers, respectively. In the other part of this study, an Yb³⁺-doped fiber was actively pumped by a laser diode during a gamma-radiation exposure to simulate the operation of an optical amplifier in a radiation environment. The response of the amplified signal was observed and monitored over time. A significant decrease in amplifier output was observed to result from the gamma-radiation exposure.

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B. P. Fox, K. Simmons-Potter, S. W. Moore, J. H. Fisher, and D. C. Meister "Gamma-radiation-induced photodarkening in actively pumped Yb³⁺-doped optical fiber and investigation of post-irradiation transmittance recovery", Proc. SPIE 7434, Optical Technologies for Arming, Safing, Fuzing, and Firing V, 74340C (28 August 2009); https://doi.org/10.1117/12.828382

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