Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation
Identifieur interne : 002850 ( Main/Exploration ); précédent : 002849; suivant : 002851Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation
Auteurs : C. Hansen [Allemagne] ; R. Brinkmann [Allemagne] ; R. Birngruber [Allemagne]Source :
- SPIE proceedings series [ 1017-2653 ] ; 1998.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
The evaporation of water by means of fiber guided pulsed mid-infrared laser radiation was investigated. The influence of the pulse duration and speckle formation on the ablation threshold was determined Optical on-line monitoring of refractive index changes at the distal fiber tip has been used to determine the cavitation threshold. Temporal and spatial speckle pattern at the distal application fiber tip were measured by imaging the fiber tip to a reference plane. An IR-CCD camera and fast IR-photodiodes were used to monitor the intensity modulation. The measured cavitation thresholds show a strong dependence on the pulse energy and the pulse duration. Overheating of water at the evaporation threshold could be calculated for the Q-switched pulse mode. Regarding speckle, spatial peak intensities up to a factor of 1.5 and 2.6 over the average intensity were evaluated for the Q-switched and the free running mode, respectively. Speckle modulation plays an important role in the free running mode to achieve the boiling point of water with the threshold radiant exposure determined. Furthermore, transient intensity fluctuations were measured across the beam profile at the fiber tip.
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Brinkmann</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Medical Laser Center Lübeck, Peter-Monnik-Weg 4</s1><s2>23562 Lübeck</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>23562 Lübeck</wicri:noRegion><wicri:noRegion>Peter-Monnik-Weg 4</wicri:noRegion><wicri:noRegion>23562 Lübeck</wicri:noRegion></affiliation></author><author><name sortKey="Birngruber, R" sort="Birngruber, R" uniqKey="Birngruber R" first="R." last="Birngruber">R. Birngruber</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Medical Laser Center Lübeck, Peter-Monnik-Weg 4</s1><s2>23562 Lübeck</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>23562 Lübeck</wicri:noRegion><wicri:noRegion>Peter-Monnik-Weg 4</wicri:noRegion><wicri:noRegion>23562 Lübeck</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">98-0238072</idno><date when="1998">1998</date><idno type="stanalyst">PASCAL 98-0238072 INIST</idno><idno type="RBID">Pascal:98-0238072</idno><idno type="wicri:Area/Pascal/Corpus">001195</idno><idno type="wicri:Area/Pascal/Curation">001195</idno><idno type="wicri:Area/Pascal/Checkpoint">001199</idno><idno type="wicri:explorRef" wicri:stream="Pascal" wicri:step="Checkpoint">001199</idno><idno type="wicri:doubleKey">1017-2653:1998:Hansen C:influence:of:pulse</idno><idno type="wicri:Area/Main/Merge">002A32</idno><idno type="wicri:Area/Main/Curation">002850</idno><idno type="wicri:Area/Main/Exploration">002850</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation</title><author><name sortKey="Hansen, C" sort="Hansen, C" uniqKey="Hansen C" first="C." last="Hansen">C. Hansen</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Medical Laser Center Lübeck, Peter-Monnik-Weg 4</s1><s2>23562 Lübeck</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>23562 Lübeck</wicri:noRegion><wicri:noRegion>Peter-Monnik-Weg 4</wicri:noRegion><wicri:noRegion>23562 Lübeck</wicri:noRegion></affiliation></author><author><name sortKey="Brinkmann, R" sort="Brinkmann, R" uniqKey="Brinkmann R" first="R." last="Brinkmann">R. Brinkmann</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Medical Laser Center Lübeck, Peter-Monnik-Weg 4</s1><s2>23562 Lübeck</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>23562 Lübeck</wicri:noRegion><wicri:noRegion>Peter-Monnik-Weg 4</wicri:noRegion><wicri:noRegion>23562 Lübeck</wicri:noRegion></affiliation></author><author><name sortKey="Birngruber, R" sort="Birngruber, R" uniqKey="Birngruber R" first="R." last="Birngruber">R. Birngruber</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Medical Laser Center Lübeck, Peter-Monnik-Weg 4</s1><s2>23562 Lübeck</s2><s3>DEU</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>23562 Lübeck</wicri:noRegion><wicri:noRegion>Peter-Monnik-Weg 4</wicri:noRegion><wicri:noRegion>23562 Lübeck</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">SPIE proceedings series</title><idno type="ISSN">1017-2653</idno><imprint><date when="1998">1998</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">SPIE proceedings series</title><idno type="ISSN">1017-2653</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Ablation</term><term>Cavitation</term><term>Evaporation</term><term>Instrumentation therapy</term><term>Laser</term><term>Mid infrared radiation</term><term>Monitoring</term><term>Pulse width</term><term>Spatial analysis</term><term>Speckle</term><term>Threshold detection</term><term>Thulium</term><term>Time analysis</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Traitement instrumental</term><term>Rayonnement IR moyen</term><term>Laser</term><term>Durée impulsion</term><term>Speckle</term><term>Evaporation</term><term>Cavitation</term><term>Analyse spatiale</term><term>Analyse temporelle</term><term>Monitorage</term><term>Détection seuil</term><term>Thulium</term><term>Ablation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The evaporation of water by means of fiber guided pulsed mid-infrared laser radiation was investigated. The influence of the pulse duration and speckle formation on the ablation threshold was determined Optical on-line monitoring of refractive index changes at the distal fiber tip has been used to determine the cavitation threshold. Temporal and spatial speckle pattern at the distal application fiber tip were measured by imaging the fiber tip to a reference plane. An IR-CCD camera and fast IR-photodiodes were used to monitor the intensity modulation. The measured cavitation thresholds show a strong dependence on the pulse energy and the pulse duration. Overheating of water at the evaporation threshold could be calculated for the Q-switched pulse mode. Regarding speckle, spatial peak intensities up to a factor of 1.5 and 2.6 over the average intensity were evaluated for the Q-switched and the free running mode, respectively. Speckle modulation plays an important role in the free running mode to achieve the boiling point of water with the threshold radiant exposure determined. Furthermore, transient intensity fluctuations were measured across the beam profile at the fiber tip.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country></list><tree><country name="Allemagne"><noRegion><name sortKey="Hansen, C" sort="Hansen, C" uniqKey="Hansen C" first="C." last="Hansen">C. Hansen</name></noRegion><name sortKey="Birngruber, R" sort="Birngruber, R" uniqKey="Birngruber R" first="R." last="Birngruber">R. Birngruber</name><name sortKey="Brinkmann, R" sort="Brinkmann, R" uniqKey="Brinkmann R" first="R." last="Brinkmann">R. Brinkmann</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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