Long-term degradation of UV fibers using broadband light-sources

Klein, Karl-Friedrich; Heiden, Stefan; Raithel, Philipp; Yadav, Rahul; Eckhardt, Hanns Simon; Belz, Mathias

doi:10.1117/12.2585216

Cited by 1 publication

(5 citation statements)

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“…As known from earlier works 9 , DUV light below 200 nm strongly influences solarization generated by UV induced losses including saturation behavior of the NBHO band around 265 nm. It was observed, that in high-OH UV fibers the NBOH band is generated by two mechanisms, as described in Equation 1 and 3.…”

Section: Discussion Of Resultsmentioning

confidence: 65%

“…These two peaks overlap because of their Full Width Half Maximum (FWHM) spectral width. This has been investigated in a recent publication 9,26 and showed peak wavelengths at 213 nm to 214 nm and 260 nm. However, these deviations are small in comparison to the spectral width of the defect bands.…”

Section: Theoretical Backgroundmentioning

confidence: 95%

“…With changing application requirements, usage of UV lasers, pulsed high-power lasers and emerging new broadband light-sources, the spectral and temporal solarization in silica-based UV fibers were found to be different, i.e. light-source dependent 6,7,8,9 . New, more sensitive and compact fiber optic spectroscopic applications and products were designed and established in a growing market 9,11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…light-source dependent 6,7,8,9 . New, more sensitive and compact fiber optic spectroscopic applications and products were designed and established in a growing market 9,11,12 . UV fibers were used in high pressure liquid chromatography 13 , thin layer chromatography 14 , sensitive protein detection with UV LEDs and liquid core waveguides 15 , UV gas chromatography 16 , UV laser-based pollutant sensing 17 and colored dissolved organic matter (CDOM) detection in seawater 18 , only to name a few.…”

Section: Introductionmentioning

confidence: 99%

“…Its first version described many details and included testing periods of up to 4 hours. However, within the last five years, power density of lately developed deuterium lamps increased, as well as new light-sources showed different UV solarization effects 6,9 . Due to the higher power UV density and the longer lifetime of the deuterium-lamp, a faster and higher *praithel@lytegate.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of light-sources on UV fiber damage measured with DIN standard 58145

Raithel¹,

Langner²,

Belz³

et al. 2023

Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII

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The DIN standard 58145 “Measuring method for determination of solarization effect of fused silica optical fibers” was introduced over 5 years ago to standardize the quality control for UV fibers. A deuterium lamp with a lens-based imaging system, coupling a light power density of approx. 200 µW/(cm2 nm) at 214 nm into the fiber under test, was specified as light-source. With time, the availability of new powerful broadband light-sources stimulated new applications. Further, improvements in deuterium lamps and imaging coupling systems resulted in higher light power densities. It was quickly determined that these new conditions induced different spectral and temporal UV losses, which needed to be studied. As a result, the cw-power coupled into the fibers under test, referenced at 214 nm in the original set-up, increased. We observed that two measurement systems, both assembled by the DIN standards recommendations, showed significant deviations in solarization effects at 215 nm (E’ center) and 265 nm (NBOH center). Therefore, we investigated ideal lens coupling conditions, influence of lens aging (solarization) and the influence of N2 purging of light-source and detector on permanent and transient solarization effects in fibers. A closer analysis and selective change of the spectral power between 190 nm and 260 nm wavelength coupled into silica-based fibers with undoped high-OH silica core is presented and an improved system for solarization measurements on UV fibers is recommended.

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Section: Discussion Of Resultsmentioning

confidence: 65%

Section: Theoretical Backgroundmentioning

confidence: 95%