14 November 2013 Investigation of single-mode fiber output damage by 405nm CW laser light
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Abstract
In the past, the degradation of 405 nm fiber-coupled diode laser systems was investigated in detail with focus on the input end. The coupling and transmission loss of the laser light was associated to the growth of a periodic structure on the input surface. To reduce this damage, a short launch-fiber with a good surface quality was used on the input end surface. Thereby the power transmission was stabilized for at least one month. However, damage structures appeared on the output surface of the single-mode fiber. To investigate this effect, damaged samples were taken after different periods of time and examined with a scanning electron microscope (SEM). Bulges with a submicron periodic structure were found in the core region, too. Additionally, measurements of spectral loss were performed, showing the formation of color centers in the deep UV along the length of the fiber.
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C. P. Gonschior, E. Landrock-Bill, K.-F. Klein, T. Sun, K. T. V. Grattan, "Investigation of single-mode fiber output damage by 405nm CW laser light", Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 888514 (14 November 2013); doi: 10.1117/12.2030263; https://doi.org/10.1117/12.2030263
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