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Optical Semiconductor DevicesOptical Semiconductor Devices
The Foundations of the Laser Diode
The Development of the Modern The Development of the Modern Laser DiodeLaser Diode
Founding principlesFounding principles
ElectroluminesenceElectroluminesence
Band TheoryBand Theory
Discovery of the LEDDiscovery of the LED
The Challenge of the Laser DiodeThe Challenge of the Laser Diode
Laser Diodes TodayLaser Diodes Today
Overlooked BeginningsOverlooked Beginnings
Henry J Round (1907)Henry J Round (1907)
Oleg Oleg LosevLosev
(1923)(1923)
ElectroluminescenceElectroluminescence
Electroluminescence in silicon carbide crystal fibersElectroluminescence in silicon carbide crystal fibers
The Glowing DiodeThe Glowing Diode
Luminous Luminous carborundum [silicon carborundum [silicon carbide] detector and carbide] detector and detection with detection with crystalscrystals
(1927)(1927)
Light RelayLight Relay
Band Theory of SolidsBand Theory of Solids
Bonding Structure of Crystal AtomsBonding Structure of Crystal Atoms
Band Theory of SolidsBand Theory of Solids
Doping of the latticeDoping of the lattice
Band Theory of SolidsBand Theory of Solids
Schottky DiodeSchottky Diode
Band Diagram of a Schottky DiodeBand Diagram of a Schottky Diode
vc EEhc
=
LED ConstructionLED Construction
Edge Emitting LEDEdge Emitting LED
Surface Emitting LEDSurface Emitting LED
Why LEDWhy LEDs?s?
High Internal Quantum High Internal Quantum Efficiency RatingsEfficiency Ratings
High overall efficiency ratingHigh overall efficiency rating
LED SpectrumLED Spectrum
Many Frequencies PossibleMany Frequencies Possible
Laser Diode ChallengesLaser Diode Challenges
Wavelength SpectrumWavelength Spectrum
Random Light EmissionRandom Light Emission
Phase Phase CoheranceCoherance
HeatHeat
The Challenge of LasingThe Challenge of Lasing
ProblemsProblems
Large Injection CurrentLarge Injection Current
Additional HeatAdditional Heat
SolutionsSolutions
Pulse OperationPulse Operation
Active CoolingActive Cooling
CollimationCollimation
Cleaved Mirror Resonator CavityCleaved Mirror Resonator Cavity
Laser Diode
0.2
So What About the Heat?So What About the Heat?
The SolutionThe Solution
Advances in Materials ProductionAdvances in Materials Production
HeterostructuresHeterostructures
HeterojunctionHeterojunction
Double HeterojunctionDouble Heterojunction
Double Heterojunction VisualizationDouble Heterojunction Visualization
Thank You
References(1) http://hyperphysics.phy-astr.gsu.edu/Hbase/solids/
(2) S. M. Sze, Physics of Semiconductor Devices, 2nd ed., John Wiley & Sons, New York, 1981(3) E. Fred Schubert, Light-Emitting Diodes, 2nd ed., Cambridge University Press, New York, 2006
(4) Mitsuo Fukuda, Optical Semiconductor Devices, John Wiley & Sons, New York, 1999(5) B Van Zeghbroeck, http://ece-www.colorado.edu/~bart/book/movie/movie1.htm, 2004
http://ece-www.colorado.edu/~bart/book/movie/movie1.htm
Optical Semiconductor DevicesThe Development of the Modern Laser DiodeOverlooked BeginningsElectroluminescenceThe Glowing DiodeBand Theory of SolidsBand Theory of SolidsBand Theory of SolidsSchottky DiodeLED ConstructionWhy LEDs?LED SpectrumLaser Diode ChallengesThe Challenge of LasingCollimationSo What About the Heat?The SolutionHeterojunctionDouble HeterojunctionDouble Heterojunction VisualizationThank You
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