单元光源—发光二极体及半导体雷射.PPTVIP

NKNU phys. Master Thesis Contents Advantages support SLA advantages Small volume500 micro-meter Short response time200ps High gain30dB Broad band5T Hz Support: NSC87-2112-M-017-001 NSC87-2112-M-017-002 Follow up:NSC87-2112-M-017-003 Chap.1 Introduction 1.1 Background 1.2 Study focus 1.1 Background Experiment ~1980:linear gain 1980~fs laser Nonlinear gain MIT: ps pump probe technique TDI UC Davis: fs Nonlinear index ~MIT Theory 1989:ATT 1992:UC Davis 1992:TFL(Sweden) Domestic researches 1.2 Study focus Chap.2 GaAs SLA 2.1 Introduction 2.2 SLD830 2.3 Mounting system and circuit box 2.4 SLD830 measurement 2.1 Introduction 2.2 SLD830 GaAs Direct band-gap Gain: LD,LED SLA Absorption: optical detector: Photo Diode SLD USA Sarnoff Inc. Single Quantum Well Double Hetero-junction Structure Peak wavelength: 825nm Striped angle:5 deg. Active layer:0.08 micro-meter P-side down 830 GaAs band-gap wavelength=870nm Manufactory LI Spectrum Structure Photos ~bird’s eye side 2.3 Mounting system circuit box 2.4 SLD830 measurement VI LI Spectrum ~TE TM=1:10 Transparent current Gain curve Chap.3 Theory Models 3.1 Introduction 3.2 Pump probe technique 3.3 Semi-phenomenological model 3.1 Introduction Well known equations Optical joint density of states Fermi Golden Rule Lorentzian line-shape function ?R: index，?I: gain 3.2 Pump probe technique where: h(t): resonance function G(2)(t):convolution of h(t) S(τ): auto-correlation function of G(2)(t) 3.3 Semi-phenomenological model 1989 ATT G.P. Agrawal where: Vg: group velocity g(N): gain α: Line-width Enhancement Factor Chap.4 Laser System 4.1 Introduction 4.2 Pumping source:NdYVO4 Laser 4.3 Ultra-short mode-locking Ti: sapphire Laser 4.4 Pulse-width and bandwidth 4.1 Introduction Ultra fast Mode-locking fs pulse laser 4.2 Pumping source:NdYVO4 Laser Power5W Wavelength: 532nm Quasi single frequency:??1nm Spot size:2.25mm Beam waist:1/e^2，beam divergence0.5mrad Polarization: vertical: parallel100:1 4.3 Ultra-short m