Optical fibers for 355nm pulsed lasers and high-power broadband light sources

Heimann, Jan; Klein, Karl-Friedrich; Gonschior, C. P.; Klein, Moritz; Hillrichs, Georg

doi:10.1117/12.2005146

Cited by 4 publications

(10 citation statements)

References 10 publications

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“…Spectral UVinduced losses in the UV-region have been determined with deuterium-lamp or excimer-lasers, for the last two decades. Only some optically active defects were commonly observed in undoped synthetic silica (Table 1) in [5,6,7]. Especially the E'-center with an absorption band at 215 nm and the Non-Bridging-Oxygen-Hole center (NBOHC) at 260 nm in high-OH silica are well described in the literature.…”

Section: Introductionmentioning

confidence: 94%

“…In first step, UV fibers with 70 and 100 µm core diameter and corecladding-ratio (CCR) have been characterized (fiber #1-4), from different generations [6,7]. These fibers have been manufactured in the following way [23]: silica core with high-OH content made by flame hydrolysis, fluorine doped cladding made by plasma outside deposition and Polyimide-coating cured during fiber drawing.…”

Section: Specialty Uv-fibers Under Testmentioning

confidence: 99%

“…In respect to deuterium-lamps, two statements for 355 nm lasers are obvious: a) the laser-induced UV losses are higher; b) the 260 nm band is significantly higher, especially for high pulsed lasers with 20 µJ/pulse @100 Hz (table 1 in [18]). However, the UV-damage was significantly reduced using hydrogen in the light-guiding area [7]. Further, it was found that these mechanisms are strongly temperaturedependent (see Fig.…”

Section: Introductionmentioning

confidence: 97%

“…In addition to improved standard 100 µm core fibers, double-clad fibers with 70 µm or 100 µm core diameter and a large cladding-to-core ratio have been developed. These were tested with pulsed 355 nm Nd:YAG lasers (third harmonics) and a high-power cw broadband plasma lamp [7]. A different degradation mechanism was found and is shown in Fig.1.…”

Section: Introductionmentioning

confidence: 99%

“…. 1); tests were carried out at room temperature (293 K) and at liquidnitrogen (77 K); more details in [ 7,19] In addition to 355 nm wavelength, the pulsed Nd:YAG lasers with 266 nm (fourth harmonics), are used in the following applications: MALDI-TOF, micro dissection, laser induced fluorescence (LIF), light detection and ranging (LIDAR), micro machining, marking, and basic research in bio-photonics and life science. They are also used as replacement for Nitrogen gas lasers when high reliability and low service cost is a requirement.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of optical damage in specialty fiber at 266 nm wavelength

Tobisch

Ohlmeyer

Zimmermann³

et al. 2014

SPIE Proceedings

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Improved multimode UV-fibers with core diameters ranging from 70 to 600 µm diameter have been manufactured based on novel preform modifications and fiber processing techniques. Only E'-centers at 214 nm and NBOHC at 260 nm are generated in these fibers.A new generation of inexpensive laser-systems have entered the market and generated a multitude of new and attractive applications in the bio-life science, chemical and material processing field. However, for example pulsed 355 nm Nd:YAG lasers generate significant UV-damages in commercially available fibers. For lower wavelengths, no results on suitable multi-mode or low-mode fibers with high UV resistance at 266 nm wavelength (pulsed 4 th harmonic Nd:YAG laser) have been published. In this report, double-clad fibers with 70 µm or 100 µm core diameter and a large claddingto-core ratio will be recommended. Laser-induced UV-damages will be compared between these new fiber type and traditional UV fibers with similar core sizes. Finally, experimental results will be cross compared against broadband cw deuterium lamp damage standards.

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Section: Introductionmentioning

confidence: 94%

Section: Specialty Uv-fibers Under Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improvement of optical damage in specialty fiber at 266 nm wavelength

Tobisch

Ohlmeyer

Zimmermann³

et al. 2014

SPIE Proceedings

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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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