Transient 210-nm absorption in fused silica induced by high-power UV laser irradiation

Leclerc, Norbert; Pfleiderer, Christoph; Hitzler, Hermine; Wolfrum, J.; Greulich, Karl-Otto; Thomas, Stephan; Fabian, Heinz; Takke, Ralf; Englisch, W.

doi:10.1364/ol.16.000940

Cited by 33 publications

(18 citation statements)

References 15 publications

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“…So this can be an indication for a qualitative difference in the fiber behaviour under 308 nm and 248 nm irradiation. On the other hand, the dependence of the KrF laser induced attenuation coefficient at 210 nm on the repetition rate has also been observed [19]. This dependence is very similar to what we found for XeC1 laser induced absorption at 308 nm (Fig.…”

Section: Discussionsupporting

confidence: 87%

“…The amount of the initial drop of transmission during a few thousand laser pulses is defined by an equilibrium between production of absorption centers by laser irradiation and by the rate of restoration of these defects. For the further slow decrease of transmission after a larger number of pulses a second process is responsible, which is based on two-photon absorption (see [19] and references therein).…”

Section: Discussionmentioning

confidence: 99%

“…The absorption spectra taken after irradiation of the fiber with the excimer laser show a strong absorption band around 210 nm, which has been identified as a result of the E'-color centers [19]. It is known, that this band is also induced by 193nm and 248nm excimer laser radiation [15] and also by broad band UV light emitted by a deuterium lamp [16].…”

Section: Discussionmentioning

confidence: 99%

“…[19] have shown that after irradiation of blocks of OH-rich synthetic fused silica with 248 nm laser radiation there is also an almost complete recovery of the initial transmission during an irradiation interrupt. Switching on the laser again leads immediately to a rebuilding of the absorption bands.…”

Section: Discussionmentioning

confidence: 99%

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Transmission of XeCl excimer laser pulses through optical fibers: Dependence on fiber and laser parameters

et al. 1992

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Abstract.Measurements of the transmission of XeC1 excimer laser pulses (308 nm) through optical all-silica fibers are reported. The observed photodegradation effects during long time irradiation are dependent on the laser energy density and the laser repetition rate. Also the influence of the fiber drawing parameters and fiber geometry have been investigated. Absorption spectra of the fibers in the wavelength range from 200 nm to 400 nm before and after the irradiation with the excimer laser give some insight in the physical reasons for the changes in transmission properties. A spectral analysis of the fiber fluorescence has been performed. PACS: 78.90, 78.40F, 78.20 Many applications of lasers need the guidance of the laser energy through optical waveguides. Especially most medical applications of XeC1 excimer lasers, e.g. in laser angioplasty [1,2], minimal-invasive surgery [3] and ophthalmology [4] require the use of optical fibers. Most suitable for these purposes are quartz fibers with a core of fused silica and a cladding of doped fused silica. Manufacturing of this kind of fibers became a well established technique. Nevertheless, the interaction of high power UV laser pulses with the fiber material causes specific problems which have been investigated recently by several groups [5][6][7][8][9][10]. The maximum amount of excimer laser energy which can be transmitted is limited by the damage threshold of the fiber front surface [11,12]. But already well below this threshold photodegradation effects are observed which lead to a drop of the fiber transmission. It is well known, that UV radiation causes the formation of color centers in the quartz material. Optical fibers are ideal to study these effects, because the optical path can be made long enough to enable the detection of even weak absorption bands. Especially at 308 nm the effects are usually too small to be observed in experiments with ordinary bulk samples. Getting information on the nature of the absorbing states can help to improve the fiber properties for UV-transmission.The first scope of this work is to evaluate the influence of several laser and fiber properties on the fiber transmission. Most important laser parameters for the photodegradation * Presented at LASERION '91, June 12-14, 1991, Mtinchen (Germany) ** Present address: University of Britisch Columbia, Department of Physics, 6244 Agricultural Road, Vancouver B.C. V6T2A6, Canada are the energy density and the repetition rate. Additionally, the influence of the fiber core diameter and fiber drawing conditions has been evaluated. We have also measured fiber absorption spectra in the wavelength range between 200 nm and 400 nm before and after laser irradiation and performed a spectral analysis of the fiber fluorescence.Of practical and of theoretical interest is the fact, that the photodegradation effects are at least partly reversible. The time scale for the recovery effects is measured and discussed together with the temporal development of the fiber absorption spectra after laser ir...

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Transmission of XeCl excimer laser pulses through optical fibers: Dependence on fiber and laser parameters

et al. 1992

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“…The non-linear increase of the a stat values with the repetition rate qualitatively agrees with earlier experiments at k = 248 nm of the KrF excimer laser [14] and is attributed to the E 0 center annealing during the dark periods. Thus, it appears reasonable that at higher repetition rate, i.e.…”

Section: Repetition Rate Dependent Absorption Coefficient a Stat (U =supporting

confidence: 89%

Coefficients of stationary ArF laser pulse absorption in fused silica (type III)

Mühlig¹,

Triebel²,

Kufert³

2007

Journal of Non-Crystalline Solids

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Some Properties of a Novel Far UV Xenon Excimer Barrier Discharge Light Source

Stockwald

Neiger

1995

Contrib. Plasma Phys.

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Electrical and optical. 'properties of dielectric barrier Xenon discharge lamps, selectively emitting Xe$/172 nm vuv radiation from a multitude of transient discharge filaments have been investigated. The lamps used were uncooled and of the flat panel type with two dielectric quartz barriers and external metal electrodes. Such lamps can be considered as small scale models of much larger flat panel uv lamps. UV emission scales almost linearly with operating frequency below 10 kHz. Both uv emission and uv efficiency rise with increasing gap spacing. The specific 172 nm emission is in the range of 100 mW/cm2 for frequencies close to 100 kHz (no lamp cooling). External efficiency at high specific uv emission is close to 10%. Higher external efficiencies up to 20% are possible at lower frequencies of a few kHz, but at reduced specific uv flux.

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Transient 210-nm absorption in fused silica induced by high-power UV laser irradiation

Cited by 33 publications

References 15 publications

Transmission of XeCl excimer laser pulses through optical fibers: Dependence on fiber and laser parameters

Transmission of XeCl excimer laser pulses through optical fibers: Dependence on fiber and laser parameters

Coefficients of stationary ArF laser pulse absorption in fused silica (type III)

Some Properties of a Novel Far UV Xenon Excimer Barrier Discharge Light Source

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