Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation
Identifieur interne :
001195 ( Pascal/Corpus );
précédent :
001194;
suivant :
001196
Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation
Auteurs : C. Hansen ;
R. Brinkmann ;
R. BirngruberSource :
-
SPIE proceedings series [ 1017-2653 ] ; 1998.
RBID : Pascal:98-0238072
Descripteurs français
- Pascal (Inist)
- Traitement instrumental,
Rayonnement IR moyen,
Laser,
Durée impulsion,
Speckle,
Evaporation,
Cavitation,
Analyse spatiale,
Analyse temporelle,
Monitorage,
Détection seuil,
Thulium,
Ablation.
English descriptors
- KwdEn :
- Ablation,
Cavitation,
Evaporation,
Instrumentation therapy,
Laser,
Mid infrared radiation,
Monitoring,
Pulse width,
Spatial analysis,
Speckle,
Threshold detection,
Thulium,
Time analysis.
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.
Notice en format standard (ISO 2709)
Pour connaître la documentation sur le format Inist Standard.
| pA |
| A01 | 01 | 1 | | @0 1017-2653 |
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| A05 | | | | @2 3195 |
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| A08 | 01 | 1 | ENG | @1 Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation |
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| A09 | 01 | 1 | ENG | @1 Laser-tissue interaction, tissue optics, and laser welding III : San Remo, 5-8 September 1997 |
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| A11 | 01 | 1 | | @1 HANSEN (C.) |
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| A11 | 02 | 1 | | @1 BRINKMANN (R.) |
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| A11 | 03 | 1 | | @1 BIRNGRUBER (R.) |
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| A12 | 01 | 1 | | @1 DELACRETAZ (Guy P.) @9 ed. |
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| A12 | 02 | 1 | | @1 GODLEWSKI (Guilhem) @9 ed. |
|---|
| A12 | 03 | 1 | | @1 PINI (Roberto) @9 ed. |
|---|
| A12 | 04 | 1 | | @1 STEINER (Rudolf W.) @9 ed. |
|---|
| A12 | 05 | 1 | | @1 SVAASAND (Lars O.) @9 ed. |
|---|
| A14 | 01 | | | @1 Medical Laser Center Lübeck, Peter-Monnik-Weg 4 @2 23562 Lübeck @3 DEU @Z 1 aut. @Z 2 aut. @Z 3 aut. |
|---|
| A18 | 01 | 1 | | @1 International Society for Optical Engineering @2 Bellingham WA @3 USA @9 patr. |
|---|
| A20 | | | | @1 197-202 |
|---|
| A21 | | | | @1 1998 |
|---|
| A23 | 01 | | | @0 ENG |
|---|
| A26 | 01 | | | @0 0-8194-2627-X |
|---|
| A43 | 01 | | | @1 INIST @2 21760 @5 354000078907920250 |
|---|
| A44 | | | | @0 0000 @1 © 1998 INIST-CNRS. All rights reserved. |
|---|
| A45 | | | | @0 11 ref. |
|---|
| A47 | 01 | 1 | | @0 98-0238072 |
|---|
| A60 | | | | @1 P @2 C |
|---|
| A61 | | | | @0 A |
|---|
| A64 | | 1 | | @0 SPIE proceedings series |
|---|
| A66 | 01 | | | @0 USA |
|---|
| C01 | 01 | | ENG | @0 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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| C02 | 01 | X | | @0 002B26N |
|---|
| C03 | 01 | X | FRE | @0 Traitement instrumental @5 01 |
|---|
| C03 | 01 | X | ENG | @0 Instrumentation therapy @5 01 |
|---|
| C03 | 01 | X | SPA | @0 Tratamiento instrumental @5 01 |
|---|
| C03 | 02 | X | FRE | @0 Rayonnement IR moyen @5 02 |
|---|
| C03 | 02 | X | ENG | @0 Mid infrared radiation @5 02 |
|---|
| C03 | 02 | X | SPA | @0 Radiación infrarroja media @5 02 |
|---|
| C03 | 03 | X | FRE | @0 Laser @5 03 |
|---|
| C03 | 03 | X | ENG | @0 Laser @5 03 |
|---|
| C03 | 03 | X | GER | @0 Laser @5 03 |
|---|
| C03 | 03 | X | SPA | @0 Laser @5 03 |
|---|
| C03 | 04 | X | FRE | @0 Durée impulsion @5 04 |
|---|
| C03 | 04 | X | ENG | @0 Pulse width @5 04 |
|---|
| C03 | 04 | X | SPA | @0 Duración impulso @5 04 |
|---|
| C03 | 05 | X | FRE | @0 Speckle @5 05 |
|---|
| C03 | 05 | X | ENG | @0 Speckle @5 05 |
|---|
| C03 | 05 | X | SPA | @0 Diagrama mancha @5 05 |
|---|
| C03 | 06 | X | FRE | @0 Evaporation @5 06 |
|---|
| C03 | 06 | X | ENG | @0 Evaporation @5 06 |
|---|
| C03 | 06 | X | SPA | @0 Evaporación @5 06 |
|---|
| C03 | 07 | X | FRE | @0 Cavitation @5 07 |
|---|
| C03 | 07 | X | ENG | @0 Cavitation @5 07 |
|---|
| C03 | 07 | X | GER | @0 Kavitation @5 07 |
|---|
| C03 | 07 | X | SPA | @0 Cavitación @5 07 |
|---|
| C03 | 08 | X | FRE | @0 Analyse spatiale @5 08 |
|---|
| C03 | 08 | X | ENG | @0 Spatial analysis @5 08 |
|---|
| C03 | 08 | X | SPA | @0 Análisis espacial @5 08 |
|---|
| C03 | 09 | X | FRE | @0 Analyse temporelle @5 09 |
|---|
| C03 | 09 | X | ENG | @0 Time analysis @5 09 |
|---|
| C03 | 09 | X | SPA | @0 Análisis temporal @5 09 |
|---|
| C03 | 10 | X | FRE | @0 Monitorage @5 10 |
|---|
| C03 | 10 | X | ENG | @0 Monitoring @5 10 |
|---|
| C03 | 10 | X | SPA | @0 Monitoreo @5 10 |
|---|
| C03 | 11 | X | FRE | @0 Détection seuil @5 11 |
|---|
| C03 | 11 | X | ENG | @0 Threshold detection @5 11 |
|---|
| C03 | 11 | X | SPA | @0 Detección umbral @5 11 |
|---|
| C03 | 12 | X | FRE | @0 Thulium @2 NC @5 12 |
|---|
| C03 | 12 | X | ENG | @0 Thulium @2 NC @5 12 |
|---|
| C03 | 12 | X | GER | @0 Thulium @2 NC @5 12 |
|---|
| C03 | 12 | X | SPA | @0 Tulio @2 NC @5 12 |
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| C03 | 13 | X | FRE | @0 Ablation @5 13 |
|---|
| C03 | 13 | X | ENG | @0 Ablation @5 13 |
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| C03 | 13 | X | SPA | @0 Ablación @5 13 |
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| N21 | | | | @1 153 |
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|
|---|
| pR |
| A30 | 01 | 1 | ENG | @1 Laser-tissue interaction, tissue optics, and laser welding. Conference @2 3 @3 San Remo ITA @4 1997-09-05 |
|---|
|
|---|
Format Inist (serveur)
| NO : | PASCAL 98-0238072 INIST |
|---|
| ET : | Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation |
|---|
| AU : | HANSEN (C.); BRINKMANN (R.); BIRNGRUBER (R.); DELACRETAZ (Guy P.); GODLEWSKI (Guilhem); PINI (Roberto); STEINER (Rudolf W.); SVAASAND (Lars O.) |
|---|
| AF : | Medical Laser Center Lübeck, Peter-Monnik-Weg 4/23562 Lübeck/Allemagne (1 aut., 2 aut., 3 aut.) |
|---|
| DT : | Publication en série; Congrès; Niveau analytique |
|---|
| SO : | SPIE proceedings series; ISSN 1017-2653; Etats-Unis; Da. 1998; Vol. 3195; Pp. 197-202; Bibl. 11 ref. |
|---|
| LA : | Anglais |
|---|
| EA : | 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. |
|---|
| CC : | 002B26N |
|---|
| FD : | Traitement instrumental; Rayonnement IR moyen; Laser; Durée impulsion; Speckle; Evaporation; Cavitation; Analyse spatiale; Analyse temporelle; Monitorage; Détection seuil; Thulium; Ablation |
|---|
| ED : | Instrumentation therapy; Mid infrared radiation; Laser; Pulse width; Speckle; Evaporation; Cavitation; Spatial analysis; Time analysis; Monitoring; Threshold detection; Thulium; Ablation |
|---|
| GD : | Laser; Kavitation; Thulium |
|---|
| SD : | Tratamiento instrumental; Radiación infrarroja media; Laser; Duración impulso; Diagrama mancha; Evaporación; Cavitación; Análisis espacial; Análisis temporal; Monitoreo; Detección umbral; Tulio; Ablación |
|---|
| LO : | INIST-21760.354000078907920250 |
|---|
| ID : | 98-0238072 |
|---|
Links to Exploration step
Pascal:98-0238072
Le document en format XML
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<author><name sortKey="Hansen, C" sort="Hansen, C" uniqKey="Hansen C" first="C." last="Hansen">C. Hansen</name>
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</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><inist:fA14 i1="01"><s1>Medical Laser Center Lübeck, Peter-Monnik-Weg 4</s1>
<s2>23562 Lübeck</s2>
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</inist:fA14><author><name sortKey="Brinkmann, R" sort="Brinkmann, R" uniqKey="Brinkmann R" first="R." last="Brinkmann">R. Brinkmann</name>
<affiliation><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><author><name sortKey="Birngruber, R" sort="Birngruber, R" uniqKey="Birngruber R" first="R." last="Birngruber">R. Birngruber</name>
<affiliation><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><series><title level="j" type="main">SPIE proceedings series</title>
<idno type="ISSN">1017-2653</idno>
<imprint><date when="1998">1998</date>
</imprint><seriesStmt><title level="j" type="main">SPIE proceedings series</title>
<idno type="ISSN">1017-2653</idno>
</seriesStmt><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><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><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1017-2653</s0>
</fA01><fA05><s2>3195</s2>
</fA05><fA08 i1="01" i2="1" l="ENG"><s1>Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation</s1>
</fA08><fA09 i1="01" i2="1" l="ENG"><s1>Laser-tissue interaction, tissue optics, and laser welding III : San Remo, 5-8 September 1997</s1>
</fA09><fA11 i1="01" i2="1"><s1>HANSEN (C.)</s1>
</fA11><fA11 i1="02" i2="1"><s1>BRINKMANN (R.)</s1>
</fA11><fA11 i1="03" i2="1"><s1>BIRNGRUBER (R.)</s1>
</fA11><fA12 i1="01" i2="1"><s1>DELACRETAZ (Guy P.)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="02" i2="1"><s1>GODLEWSKI (Guilhem)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="03" i2="1"><s1>PINI (Roberto)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="04" i2="1"><s1>STEINER (Rudolf W.)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="05" i2="1"><s1>SVAASAND (Lars O.)</s1>
<s9>ed.</s9>
</fA12><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>
</fA14><fA18 i1="01" i2="1"><s1>International Society for Optical Engineering</s1>
<s2>Bellingham WA</s2>
<s3>USA</s3>
<s9>patr.</s9>
</fA18><fA20><s1>197-202</s1>
</fA20><fA21><s1>1998</s1>
</fA21><fA23 i1="01"><s0>ENG</s0>
</fA23><fA26 i1="01"><s0>0-8194-2627-X</s0>
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<s2>21760</s2>
<s5>354000078907920250</s5>
</fA43><fA44><s0>0000</s0>
<s1>© 1998 INIST-CNRS. All rights reserved.</s1>
</fA44><fA45><s0>11 ref.</s0>
</fA45><fA47 i1="01" i2="1"><s0>98-0238072</s0>
</fA47><fA60><s1>P</s1>
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</fA64><fA66 i1="01"><s0>USA</s0>
</fA66><fC01 i1="01" l="ENG"><s0>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.</s0>
</fC01><fC02 i1="01" i2="X"><s0>002B26N</s0>
</fC02><fC03 i1="01" i2="X" l="FRE"><s0>Traitement instrumental</s0>
<s5>01</s5>
</fC03><fC03 i1="01" i2="X" l="ENG"><s0>Instrumentation therapy</s0>
<s5>01</s5>
</fC03><fC03 i1="01" i2="X" l="SPA"><s0>Tratamiento instrumental</s0>
<s5>01</s5>
</fC03><fC03 i1="02" i2="X" l="FRE"><s0>Rayonnement IR moyen</s0>
<s5>02</s5>
</fC03><fC03 i1="02" i2="X" l="ENG"><s0>Mid infrared radiation</s0>
<s5>02</s5>
</fC03><fC03 i1="02" i2="X" l="SPA"><s0>Radiación infrarroja media</s0>
<s5>02</s5>
</fC03><fC03 i1="03" i2="X" l="FRE"><s0>Laser</s0>
<s5>03</s5>
</fC03><fC03 i1="03" i2="X" l="ENG"><s0>Laser</s0>
<s5>03</s5>
</fC03><fC03 i1="03" i2="X" l="GER"><s0>Laser</s0>
<s5>03</s5>
</fC03><fC03 i1="03" i2="X" l="SPA"><s0>Laser</s0>
<s5>03</s5>
</fC03><fC03 i1="04" i2="X" l="FRE"><s0>Durée impulsion</s0>
<s5>04</s5>
</fC03><fC03 i1="04" i2="X" l="ENG"><s0>Pulse width</s0>
<s5>04</s5>
</fC03><fC03 i1="04" i2="X" l="SPA"><s0>Duración impulso</s0>
<s5>04</s5>
</fC03><fC03 i1="05" i2="X" l="FRE"><s0>Speckle</s0>
<s5>05</s5>
</fC03><fC03 i1="05" i2="X" l="ENG"><s0>Speckle</s0>
<s5>05</s5>
</fC03><fC03 i1="05" i2="X" l="SPA"><s0>Diagrama mancha</s0>
<s5>05</s5>
</fC03><fC03 i1="06" i2="X" l="FRE"><s0>Evaporation</s0>
<s5>06</s5>
</fC03><fC03 i1="06" i2="X" l="ENG"><s0>Evaporation</s0>
<s5>06</s5>
</fC03><fC03 i1="06" i2="X" l="SPA"><s0>Evaporación</s0>
<s5>06</s5>
</fC03><fC03 i1="07" i2="X" l="FRE"><s0>Cavitation</s0>
<s5>07</s5>
</fC03><fC03 i1="07" i2="X" l="ENG"><s0>Cavitation</s0>
<s5>07</s5>
</fC03><fC03 i1="07" i2="X" l="GER"><s0>Kavitation</s0>
<s5>07</s5>
</fC03><fC03 i1="07" i2="X" l="SPA"><s0>Cavitación</s0>
<s5>07</s5>
</fC03><fC03 i1="08" i2="X" l="FRE"><s0>Analyse spatiale</s0>
<s5>08</s5>
</fC03><fC03 i1="08" i2="X" l="ENG"><s0>Spatial analysis</s0>
<s5>08</s5>
</fC03><fC03 i1="08" i2="X" l="SPA"><s0>Análisis espacial</s0>
<s5>08</s5>
</fC03><fC03 i1="09" i2="X" l="FRE"><s0>Analyse temporelle</s0>
<s5>09</s5>
</fC03><fC03 i1="09" i2="X" l="ENG"><s0>Time analysis</s0>
<s5>09</s5>
</fC03><fC03 i1="09" i2="X" l="SPA"><s0>Análisis temporal</s0>
<s5>09</s5>
</fC03><fC03 i1="10" i2="X" l="FRE"><s0>Monitorage</s0>
<s5>10</s5>
</fC03><fC03 i1="10" i2="X" l="ENG"><s0>Monitoring</s0>
<s5>10</s5>
</fC03><fC03 i1="10" i2="X" l="SPA"><s0>Monitoreo</s0>
<s5>10</s5>
</fC03><fC03 i1="11" i2="X" l="FRE"><s0>Détection seuil</s0>
<s5>11</s5>
</fC03><fC03 i1="11" i2="X" l="ENG"><s0>Threshold detection</s0>
<s5>11</s5>
</fC03><fC03 i1="11" i2="X" l="SPA"><s0>Detección umbral</s0>
<s5>11</s5>
</fC03><fC03 i1="12" i2="X" l="FRE"><s0>Thulium</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03><fC03 i1="12" i2="X" l="ENG"><s0>Thulium</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03><fC03 i1="12" i2="X" l="GER"><s0>Thulium</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03><fC03 i1="12" i2="X" l="SPA"><s0>Tulio</s0>
<s2>NC</s2>
<s5>12</s5>
</fC03><fC03 i1="13" i2="X" l="FRE"><s0>Ablation</s0>
<s5>13</s5>
</fC03><fC03 i1="13" i2="X" l="ENG"><s0>Ablation</s0>
<s5>13</s5>
</fC03><fC03 i1="13" i2="X" l="SPA"><s0>Ablación</s0>
<s5>13</s5>
</fC03><fN21><s1>153</s1>
</fN21><pR><fA30 i1="01" i2="1" l="ENG"><s1>Laser-tissue interaction, tissue optics, and laser welding. Conference</s1>
<s2>3</s2>
<s3>San Remo ITA</s3>
<s4>1997-09-05</s4>
</fA30><server><NO>PASCAL 98-0238072 INIST</NO>
<ET>Influence of pulse width and speckle formation on the ablation thresholds in water by means of pulsed mid-IR laser radiation</ET>
<AU>HANSEN (C.); BRINKMANN (R.); BIRNGRUBER (R.); DELACRETAZ (Guy P.); GODLEWSKI (Guilhem); PINI (Roberto); STEINER (Rudolf W.); SVAASAND (Lars O.)</AU>
<AF>Medical Laser Center Lübeck, Peter-Monnik-Weg 4/23562 Lübeck/Allemagne (1 aut., 2 aut., 3 aut.)</AF>
<DT>Publication en série; Congrès; Niveau analytique</DT>
<SO>SPIE proceedings series; ISSN 1017-2653; Etats-Unis; Da. 1998; Vol. 3195; Pp. 197-202; Bibl. 11 ref.</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>002B26N</CC>
<FD>Traitement instrumental; Rayonnement IR moyen; Laser; Durée impulsion; Speckle; Evaporation; Cavitation; Analyse spatiale; Analyse temporelle; Monitorage; Détection seuil; Thulium; Ablation</FD>
<ED>Instrumentation therapy; Mid infrared radiation; Laser; Pulse width; Speckle; Evaporation; Cavitation; Spatial analysis; Time analysis; Monitoring; Threshold detection; Thulium; Ablation</ED>
<GD>Laser; Kavitation; Thulium</GD>
<SD>Tratamiento instrumental; Radiación infrarroja media; Laser; Duración impulso; Diagrama mancha; Evaporación; Cavitación; Análisis espacial; Análisis temporal; Monitoreo; Detección umbral; Tulio; Ablación</SD>
<LO>INIST-21760.354000078907920250</LO>
<ID>98-0238072</ID>
</server>
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