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ÊéÃû£ºLiquidDropletDyeLaser

×÷ÕߣºHatim Azzouz
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Contents
1 Introduction 4
2 Hydrostatics of Microdroplets 6
2.1Introduction..............................6
2.2SurfaceTension............................6
2.2.1ForceandEnergyDescription................7
2.2.2SurfaceTensioninTheFormalismofThermodynamic..8
2.2.3TheYoungLaplaceEquation................10
2.2.4Bondnumber.........................11
2.3ContactAngle............................12
2.3.1TheYoungEquation.....................12
2.3.2Wetting............................14
2.3.3RoughSurfaces........................14
2.4SimulatingTheDropletShape...................16
3 Laser Theory and Fundamentals 20
3.1InteractionofradiationandMatter.................20
3.1.1DefinitionofRadiativeProcesses..............20
3.1.2Einstein¡¯sAandBcoe?cient................22
3.2PopulationInversionandLaserThreshold.............23
3.3EssentialElementsofaLaser....................24
3.3.1ThePump..........................24
3.3.2DyeLaserasTheActiveMedium..............25
3.3.3TheResonator........................26
3.4LaserOperation...........................27
3.5Multi-modeLaserOscillation....................29
4 The Resonator Model 32
4.1IntroductiontoTheSphericalDropletResonator.........32
4.2WhisperingGalleryModes......................33
4.3AnalyticalModelforModesinASphere..............36
4.3.1DiscussionofTheSimilaritiesbetweenTheResonatorModel
andTheLiquidDroplet...................41
4.4NumericalCalculationsofTheModesinASphere........42
5 Fabrication of Hydrophobic Surfaces 50
5.1TheUntreatedSurfaces-AStandardofReference........50
5.2FluorocarbonDepositedSi-surfaces.................52
5.3Nanoglass GrownonSi-surfaces.................56
5.4BlackSiliconSurfaces........................57
5.4.1ReactiveIonEtching.....................57
5.4.2ContactAngleMeasurementsonBSSurfacesDeposited
withTeflon . . . . . . . . . . . . . . . . . . . . . . . . . 60
5.5BSSurfacewithGrooves.......................62
5.6ScanningElectronMicroscope....................65
6 Materials and Setup 66
6.1TheMetallicSetupBox.......................66
6.2TheMicroscopeSystem.......................68
6.2.1TheTV-microscope.....................68
6.2.2TheSpectrometerandTheOpticalFiber.........69
6.3ThePumpLaser...........................70
6.4ThePeltierElement.........................70
6.5DropletCreation...........................72
6.5.1TheSprayingTechniqueandPipette............72
6.5.2TheTOPS-INPins......................72
6.5.3TheDipPenMethod....................73
6.6TheNd:YAGLaserSetup......................74
7 Optical Characterization 76
7.1OpticalPumpingLight........................76
7.2EvaporationofTheEthyleneGlycolDroplet............78
7.2.1EvaporationRate.......................78
7.2.2EvaporationRatewithTheUseofThePeltierElement
DuringPumpLasing.....................80
7.3LasingMeasurements........................82
7.3.1DropletDyeLaseronARoughSi-fluorocarbonSurface.83
7.3.2DropletDyeLaseronABSSurface............87
7.3.3DropletDyeLaseronABS-grooveSurface........90
7.3.4Mode-spacing.........................94
7.4LevitatedLiquidDropletDyeLaser................96
7.4.1TheUltrasonicLevitator..................96
7.4.2LasingMeasurements....................97
7.4.3Mode-spacing.........................102
7.5Summary...............................104
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