nknu phys. master thesis
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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NKNU phys. Master Thesis
The measurement and study of
femto-second gain dynamics of
GaAs single quantum well
semiconductor laser amplifiers 國立彰化師大物理系博士班入學口試
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Contents
•Chap.1 Introduction
•Chap.2 GaAs SLA
•Chap.3 Theory
•Chap.4 Laser system
•Chap.5 Gain dynamics
•Chap.6 Summary
•Appendix
3
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Advantages & support SLA advantages
Small volume<500 micro-meter Short response time<200ps High gain>30dB Broad band>5T Hz
Support: NSC87-2112-M-017-001 NSC87-2112-M-017-002 Follow up:NSC87-2112-M-017-003
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Chap.1 Introduction 1.1 Background 1.2 Study focus
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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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:AT&T 1992:UC Davis 1992:TFL(Sweden)
Domestic researches
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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1.2 Study focus
雷射性質量測
激發偵測實驗組裝
自製載台設計與製作
SLA基本性質量測
增益機制量測
結果分析
半導體雷射放大器飛秒增益機制研究
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Chap.2 GaAs SLA 2.1 Introduction 2.2 SLD830 2.3 Mounting system and circuit box 2.4 SLD830 measurement
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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2.1 Introduction
Tx
Tx
Tx
Tx
Rx
Rx
Rx
Rx
(a)In line amplifiers
AA
(b)Power amplifiers
A
(c)Pre-amplifiers
(d) LAN amplifiers
A
A
fiber
fiber
fiberfiber
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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放大器
電放大器 雷射放大器 聲放大器
半導體雷射放大器 (SLA)
摻鉺光纖雷射放大器(EDFA)
能量守恆放大訊號
是否抗反射
是
行波式(TWSLA)
否
FP 式(FPSLA)
結構
塊材(bulk)
量子井(quantum well)
量子線(quantum wire)
量子點(quantum dot)
應用波段
長波長 1300~1500nm
短波長800nm
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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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
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Manufactory LI & Spectrum
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Structure
substrate
p-metal
p-GaAs
p-confiningactive
p-Al 0.4Ga0.6As(1.5μm)Al 0.04Ga0.96As(0.08μm)
θ
n-confining
p-cap
n-Al 0.4Ga0.6As(1.5μm)
p-GaAs(0.5μm)SiO2(0.01μm)
n-metal
Zinc diffusion
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Photos ~bird’s eye & side
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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2.3 Mounting system &circuit box
(a)
(b)
21.5°
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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自製載台流程
量測樣品長寬高
考慮載台符合各種需求
繪製載台設計圖
實際製作載台
載台是否合乎需求
載台製作是否合乎需求
完成自製載台
是
否
是
否
修改
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(a) 樣品裝載;(b) 頂住的螺絲(c)SMA 接頭;(d) 基座;(e) 基座裝載;(f) 絕緣夾層;(g) 載台支撐棒;(h) 圓形壓版。
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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2.4 SLD830 measurement
電壓對電流曲線(V-I)
發光對電流曲線(L-I)
頻譜(Spectrum)
穿透電流(transparent
current)
增益曲線(gain curve)
半導體雷射放大器性質量測
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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VI
SLAPowerDetector
V
SpectralAnalyzer
GaAs SQW SLA V-I curve
0
0.5
1
1.5
2
0 10 20 30 40 50 60 70 80 90 100 110
I(mA)V(v
olt)
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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LIGaAs SQW SLA L-I curve
0
20
40
60
80
100
120
140
160
0 10 20 30 40 50 60 70 80 90 100 110
I(mA)
L(μ
W)
GaAs SQW SLA L-I curve
0
20
40
60
80
100
120
0 20 40 60 80 100 120
I(mA)
L(μ
W)
TMTE
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Spectrum ~TE & TM=1:10
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Bandwidth=2nm
23
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Transparent current
Lockin
CW Ti:saphhire
chopper
SLA
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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SLD-830 transparent current
-100
-50
0
50
100
150
0 20 40 60 80 100 120
I(mA)
Vol
tage
(μV
)
25mA
25
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Gain curve
Lockin
CW Ti:saphhire
chopper
SLA
powerdetector
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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SLD-830 Gain curve
-10
0
10
20
30
0 20 40 60 80 100 120
I (mA)
Gai
n (d
B)
27
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Chap.3 Theory Models 3.1 Introduction 3.2 Pump probe technique 3.3 Semi-phenomenological model
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高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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3.1 Introduction
cm
kcEE
2
22
vm
kvEE
2
22
Where:mc: electron effective mass in conduction bandmv: hole effective mass in valance bandEc: bottom energy of conduction bandEv: top energy of valance bandEg( energy gap)=Ec-Ev
In semiconductors: two level energy model+ energy conservation law + momentum conservation law+ boundary conditions
29
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Well known equations Optical joint density of states Fermi Golden Rule Lorentzian line-shape function
30
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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R: index , I: gain
phph
phphvphc
Eg
phR dT
ffM
22
2 /1)()()()(
ph
ph
phvphc
Eg
phI dT
TffM
22
2
22
/1)(
/1)()()(
31
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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32
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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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)
)()(*)()()(*)( )2(111 tGthdtttItIdtthdtS
33
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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3.3 Semi-phenomenological model
1989 AT&T G.P. Agrawal
where: Vg: group velocity g(N): gain α: Line-width Enhancement Factor
ANgit
A
vz
A
g
)()1(2
11
34
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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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
35
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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4.1 Introduction Ultra fast Mode-locking fs pulse laser
36
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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4.2 Pumping source:NdYVO4
Laser
Power>5W Wavelength: 532nm Quasi single frequency:<1nm Spot size:2.25mm Beam waist:1/e^2 , beam divergence<0.
5mrad Polarization: vertical: parallel>100:1
37
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Coherent Verdi
38
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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4.3 Ultra-short mode-locking Ti: sapphire Laser
Wavelength tunable:730~850nm Repetition rate:76MHz CW power:800mW Mode-locking power:600mW Peak power:50KW Spot size:0.8mm Full angle divergence:1.5mrad Polarization:TEM00,p polarization
39
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Coherent Mira
40
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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4.4 Pulse-width and bandwidth
41
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Auto-correlator
Femto-chrome FR-103XL
42
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Pulse-width=110fs un-chirped
43
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Line-width=10nm transform limited
OSA:HP 71451B
44
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
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Chap.5 Gain Dynamics 5.1 Introduction 5.2 Pump probe system 5.3 Gain dynamics 5.4 Experiment result
45
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
5.1 Introduction Pump probe 3 factors =pump beam + probe beam +time
delay Two beams pump probe/three beams Parallel polarization/orthogonal
polarization Refraction /reflection
46
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
5.2 Pump probe system System
requirements Experiment
sketch
47
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
System requirements Pump & probe power tunable Pump & probe polarization tunable Wavelength tunable SLA driving current tunable Time delay tunable Alignment requirement Fine tuning and double check
48
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Experiment sketch
49
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Data acquisition &instrument control
Detector
stepper
chopper
λ/2λ/2
ND Filter30/70 BS
70/30 BS
SLA
Ti:SA Laser
probe
pump Dataacquisition
PC
50
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
5.3 Gain dynamicsPUMP PROBE CALIBRATION
probe voltage1mV@40mA.20mW
probe signal400nV@40mA.20mW
pump:probe=1:1
pump voltage1mV@40mA.20mW
pump signal400nV@40mA.20mW
attenuatedprobe signal20nV@40mA.1mW
fixed
alternative
51
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
5.4 Experiment result Carrier Depletion (CD): linear, ps scale Carrier Heating (CH) Free Carrier Absorption (FCA) * Two Photon Absorption (TPA )* Spectral Hole Burning (SHB )* *:can’t be resolved in my experiment
52
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
(a)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12Time delay(ps)
Norm
. pro
be tra
ns.
(au).
(b)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be t
rans.
(au)
(c)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
No
rm.
pro
be t
ran
s.(a
u)
Pump: probe=10:1,50.60.70mA
53
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Results analysis~10:1 50mA:
-10ps~-1ps:norm. probe=1 , probe fall behind pump: no gain
-1ps~0ps:norm. probe=0.6~0.7:CD recover time>10ps
0ps~2ps:dip~1ps , CH 60mA:like 50mA 70mA:like 50mA
54
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
(a)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be t
rans.(
au)
(b)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
No
rm.
pro
be
tran
s.(a
u)
(c)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be t
rans.
(au)
Pump: probe=20:1,50.60.70mA
55
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Results analysis~20:1 50mA:like 10:1 60mA:like 10:1 70mA:like 10:1
56
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Pump: probe=30:1,50.60.70mA
(a)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be t
rans.
(au) (b)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be t
rans.
(au)
(c)
0
0.2
0.4
0.6
0.8
1
1.2
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be t
rans.(
au)
No CH?
57
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Results analysis~30:1 50mA:no CH? Saturated? 60mA:like 10:1 70mA:like 10:1
58
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
50mA overlapping50mA
0.5
0.6
0.7
0.8
0.9
1
1.1
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Nor
m. p
robe
tran
s.(a
u) 10:1
20:1
30:1
59
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
60mA overlapping
60mA
0.5
0.6
0.7
0.8
0.9
1
1.1
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Nor
m. p
robe
tran
s.(a
u)
10:1
20:1
30:1
60
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
70mA overlapping
70mA
0.5
0.6
0.7
0.8
0.9
1
1.1
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Nor
m. p
robe
tran
s.(a
u)
10:1
20:1
30:1
61
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Conclusion CD:50mA 、 60mA&70mA:10:1 、 20:1&30:1 ,
linear norm. probe from 1 to 0.5~0.8 recover time>10ps =>fit well with other theses
CH:50mA 、 60mA&70mA: 10:1 、 20:1 nonlinear increasing , 30:1 saturated? or cohere
nt artifacts? Norm. probe: dip Relaxation time <1ps =>fit well with other theses
<110 fs nonlinearity can’t be resolved (TPA,FCA,SHB)
62
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Curve fitting function 1987 MIT Ippen. et al h(t)=a0+a1*exp(-t/τ1)+a2*exp(-t/τ2) a0=0.5 、 a1=-1 、 a2=0.5 、 τ1=0.65ps 、 τ2=0.2ps constraints: 1>a0>0 、 a1<0 、 a2>0 where a0:long lasting term ,a1 、 a2:short lasting term =>CH:650 fs Mine:a0=0.7 、 a1=-2.65 、 a2=3 、 τ1=0.68ps 、 τ2=0.
56ps =>CH:680 fs fit quite well!
63
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Curve fitting graph
Gain dynamics curve fitting
0.5
0.6
0.7
0.8
0.9
1
1.1
-10 -8 -6 -4 -2 0 2 4 6 8 10 12
Time delay(ps)
Norm
. pro
be tr
ans.(
au)
Experiment
curve fitting
64
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Chap.6 Conclusion 6.1 Summary 6.2 Future works
65
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
6.1 Summary I have successfully built up the
measurement system of gain dynamics. Light source (Verdi+ Mira) measurement:
Pulse-width:110fs :un-chirped Line-width:10nm :transform limited
Sample (SLD830)measurement: highly polarization dependent transparent current is about 25mA gain:25dB at 100mA
66
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Summary-2 Gain dynamics measurement:
femto-second resolving ability tunable power 、 time delay and polarization of pump beam and pr
obe beam expandability of different samples ability to co-operate with the computerized instrument control and
data acquisition system. Experiment data
slow recovering term :time constant is much bigger than 10ps fast recovering term :time constant is about 580fs
Possible corresponding explanation slow recovering term: CD fast recovering term :dominated by CH
67
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
6.2 Future works Pulse
above and below band-gap chirped or compressed
Gain dynamics more evidence coherent artifacts
Index dynamics Simulation
68
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Appendix A. Data acquisition and instrument
control B. Theory deducing C. Conference poster: PSROC
69
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
A. Data acquisition and instrument control
70
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
B. Theory deducing
),(])(22
[2
222
22 tzAAibt
iz p
),()}(]1)[(2
1]
)(
1)[(
2
1{ tzAtOitgi
tftg gTTNN
71
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
C. Conference poster: PSROC-1999
Femto-second Pump Probe Measurement of GaAs Single Quantum Well Semiconductor Laser Amplifiers
T.H. Wang ( 王尊信 ), Y.H. Chang( 張玉衡 ), and Y.H. Chen( 陳雅惠 )
Pump-probe Data Acquisition Control System for Semiconductor Laser Amplifiers
Y.H. Chen( 陳雅惠 ),Y.H. Chang( 張玉衡 ),T.H. Wang( 王尊信 )
72
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
高師大物理系 超快光電實驗室Ultrafast OptoElectronics LaboratoryDepartment of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, R.O.C.Tel: 886-7-7172930 Ext. 3273 Fax: 886-7-7111681 WWW: http://www.nknu.edu.tw/~oelab/
UOEL 王尊信 撰王尊信 撰
Hyper-links
•Mounting system
•System requirements
•Experiment setup
•Experiment results
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