Influence of high power 405 nm multi-mode and single-mode diode laser light on the long-term stability of fused silica fibers

Gonschior, C. P.; Klein, Karl-Friedrich; Sun, Tao; Grattan, K. T. V.

doi:10.1117/12.923138

Cited by 3 publications

(4 citation statements)

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“…The power density in the fiber core is in the range of 1.3 MW/cm² but on the proximal end-face lower than 5 kW/cm². Further quantitative results in respect to time-dependent losses are published in [17] and [18].…”

Section: Damage Testsmentioning

confidence: 97%

Surface and bulk effects in silica fibers caused by 405 nm CW diode laser irradiation and means for mitigation

et al. 2012

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Surface and bulk effects in silica optics due to high intensity laser light are well known using short pulse and high power laser systems. Surfaces are quickly destroyed mechanically if not properly prepared and thoroughly cleaned. Linear and non-linear absorption of high intensity laser light in the bulk of the optics causes material modifications, like voids, cracks and UV defects. In ablation experiments with very short pulses on wide band-gap dielectrics, periodic surface structures in the form of ripples were found. Surprisingly, we found similar structures on fiber end-faces after long-term irradiation with 405 nm CW laser light. Power densities on the end-face are in the range of 1 MW/cm², three magnitudes of order below the power threshold at which the described damages occur. Nevertheless a ripple structure perpendicular to the polarization direction of the laser was formed and grows with irradiation time. An increased absorption band at 214 nm (E' center) along the fiber was discovered by spectral absorption measurements. E' centers can be generated by 405 nm laser light in the bulk, therefore defects on the surface are possible as well. The generation of defect centers on the silica surface can enhance the formation of an unstable surface layer.

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Section: Damage Testsmentioning

confidence: 97%

Surface and bulk effects in silica fibers caused by 405 nm CW diode laser irradiation and means for mitigation

et al. 2012

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“…Figure 4 shows that the damage rate is below 0.03 dB/day for the protected samples. For comparison, the damage rate for SMF samples without protection irradiated with the SML was 0.2 to 1 dB/day, depending on the surface preparation [4]. On the surfaces of the launch-fiber no damage could be found after the irradiation.…”

Section: Performance Of Fiber-coupled Diode Laser Systems With Launchmentioning

confidence: 99%

“…Additional parameters for the growth of the structure, like height in the center, the radius of curvature, and the amplitude of the ripple, are given in Table 3. The periodic structure was designed to fit the surface structure measured with AFM on a launching surface of a SMF [4]. The smaller periodic structures are down scaled designs of the 700 nm high structure.…”

Section: Simulation Of Distal End Surface Damagementioning

confidence: 99%

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High power 405nm diode laser fiber-coupled single-mode system with high long-term stability

Gonschior

Klein

Heyse³

et al. 2013

SPIE Proceedings

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Investigation of single-mode fiber degradation by 405-nm continuous-wave laser light

et al. 2014

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The degradation of 405-nm fiber-coupled diode laser systems with more than 50 mW power was investigated in detail with focus on the effects occurring at the input end. The coupling and transmission loss of the laser light were associated with the growth of a projection and a periodic structure on the input surface. To avoid this degradation, a short launch fiber with a good surface quality was used at the input end. In this way, the power transmission was stabilized for at least one month. However, structural degradation was noticed on the output surface of the single-mode fiber. To investigate this effect, the damaged samples were measured after different periods of time and examined with a scanning electron microscope and with an atomic force microscope. Reproducible spherical projections with a submicron periodic structure were found in the core region. Additionally, the spectral loss of the fiber was measured, showing the formation of color centers in the deep ultraviolet along the length of the fiber. These investigations were accompanied by simulations of the growth of the structure on the output surface. The influence of the structure was mainly on the divergence angle of the emitted laser beam, reducing the beam quality for applications

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Influence of high power 405 nm multi-mode and single-mode diode laser light on the long-term stability of fused silica fibers

Cited by 3 publications

References 0 publications

Surface and bulk effects in silica fibers caused by 405 nm CW diode laser irradiation and means for mitigation

Surface and bulk effects in silica fibers caused by 405 nm CW diode laser irradiation and means for mitigation

High power 405nm diode laser fiber-coupled single-mode system with high long-term stability

Investigation of single-mode fiber degradation by 405-nm continuous-wave laser light

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