Status and improvements of UV laser scalpel

Köhler, Marco; Dietz, Hartmut; Matsuura, Yuji; Miyagi, Mitsunobu; Klein, Karl F.; Hillrichs, Georg

doi:10.1117/12.478065

Cited by 4 publications

(1 citation statement)

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“…When MMF are used for high-power excimer laser light delivery [8,9], the surface damage threshold of synthetic silica is the primary limit. Severe optical damage is observed at power densities above 1 GW/cm² for pulsed lasers [10].…”

Section: Introductionmentioning

confidence: 99%

Generation of periodic surface structures on silica fibre surfaces using 405 nm CW diode lasers

Gonschior

Klein

Sun

et al. 2013

Journal of Non-Crystalline Solids

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent repository link ABSTRACTPeriodic surface structures have been observed on the end surfaces of synthetic silica fibres when they are exposed to long-term irradiation with light from a 405 nm CW diode laser. The surface structures are generated when the laser power is at a level which is three magnitudes of order lower than that of the damage threshold. They exhibit multiple bends, break-ups and bifurcations, unlike interference patterns but rather like the effect caused by short-pulsed laser irradiation on wide band-gap insulators. The detailed investigation undertaken in this work has concluded that the key parameters that contribute to the generation of the surface structures are power density, surface roughness, polarisation direction and the presence of ultraviolet defect centres.

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Section: Introductionmentioning

confidence: 99%

Generation of periodic surface structures on silica fibre surfaces using 405 nm CW diode lasers

Gonschior

Klein

Sun

et al. 2013

Journal of Non-Crystalline Solids

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Fabrication of Pure Silica Core Multimode Ultraviolet Optical Fibre Probes by Tube Etching

Huo

Shi

2007

Chinese Phys. Lett.

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As a light wave-guide component for transmitting ultraviolet (UV) laser pulses, pure silica core UV fibre probes have attracted a great deal of attention in the near-field optical data storage and bio-medical studies. We fabricate UV fibre probes with tips in dimension of about 2–5 μm and taper angle 16° by the tube etching method, using 40% HF acid as etching solution and xylene as overlayer. Probes produced have curvy configuration with smooth surface. The yield of fine probes is rather high and etching operation greatly simplified. With higher damage threshold, pure silica core multimode UV fibre probes can be coupled into more laser power. In addition, using UV light reduces the cutoff wavelength of the fibre probes, which is in favour of increasing the transmission efficiency of the probe. Furthermore, the larger tip dimension helps to enhance the light throughput either. The advances of fabrication technique of UV optical fibre probe may further support the studies of UV light data storage, pulsed laser biosurgery and UV photolithography.

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UV-fibers: two decades of improvements for new applications

Klein

Khalilov²

2015

SPIE Proceedings

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Multimode UV-fibers with high-OH synthetic silica core and F-doped silica cladding have been available for over 40 years. At the beginning, the spectral UV-range above 250 nm wavelength was commonly used, because the generation of UV-absorbing defect centers prevented reliable light transfer below 250 nm; even light from a low-power broadband deuterium-lamp was sufficient to damage these UV-fibers of the 1 st generation. However, even then, applications in the field of spectroscopy, laser light delivery, sensors and process control were discussed and improvements of fiber quality in this very interesting UVC range required by researchers and industrical end-users. Starting in 1993 with hydrogen-loaded fibers, further modification in preform and fiber manufacturing including additional fiber treatments lead to currently available hydrogen-free UV-fiber (4 th generation) with significantly improved stability in the DUV-region below 250 nm, enabling routine use of optical fibers in this field. In addition to the UV-fiber improvements, some selected UV fiber-optic applications using broadband deuterium-lamps will be discussed. Finally, there is still room for further improvements, especially in combination with newly available pulsed UV light sources, which are low-cost, small sized and highly reliable.

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Status and improvements of UV laser scalpel

Cited by 4 publications

References 0 publications

Generation of periodic surface structures on silica fibre surfaces using 405 nm CW diode lasers

Generation of periodic surface structures on silica fibre surfaces using 405 nm CW diode lasers

Fabrication of Pure Silica Core Multimode Ultraviolet Optical Fibre Probes by Tube Etching

UV-fibers: two decades of improvements for new applications

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