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STANFORD Advanced LIGO Photodiode Development ______ David B. Jackrel, Homan B. Yuen, Seth R. Bank,...
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Transcript of STANFORD Advanced LIGO Photodiode Development ______ David B. Jackrel, Homan B. Yuen, Seth R. Bank,...
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STANFORD
Advanced LIGO Photodiode Development
______
David B. Jackrel, Homan B. Yuen, Seth R. Bank, Mark A. Wistey, Xiaojun Yu, Junxian Fu, Zhilong Rao, and
James S. Harris, Jr.
Solid State Research Lab, Stanford University
LSC Meeting – LLO
March 22nd, 2005LIGO-G050116-00-Z
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STANFORD
Outline
AdLIGO Photodiode Specifications
Device Results
Damage Threshold
AdLIGO Devices
Future Directions
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STANFORD
Advanced LIGO Schematic
Power Stabilization
Auxiliary Length Sensing
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STANFORD
Photodiode Specifications
LIGO I Advanced LIGO
Detector
Bank of 6PDs
Power Stabilizati
on
Aux. Length (RF)
Detection
DC - GW Channel
Steady-State
“Power”0.6 W 200 ~ 300
mA 10 – 100 mW 30 mW
Operating
Frequency
~29 MHz 100 kHz 200 MHz 100 kHz
Quantum
Efficiency
80% > 80% 90%
(300mA)/(0.868A/W
* 0.90 QE) = 385mW
Resonating Tank Circuit Trades w/
Sensitivity
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STANFORD
Conventional PD Adv. LIGO Rear-Illuminated PD
High Power Linear
Response High Speed
Rear-Illuminated PD Advantages
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STANFORD
Materials Analysis –InGaAs/GaAs vs. GaInNAs/GaAs
X-Ray DiffractionX-Ray Diffraction
Transmission Electron MicroscopyTransmission Electron Microscopy
Surface Roughness MappingSurface Roughness Mapping
PhotoluminescencePhotoluminescence
Deep-Level Transient SpectroscopyDeep-Level Transient Spectroscopy
Absorption SpectraAbsorption Spectra
Etc.Etc.
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STANFORD
Device Internal Quantum Efficiency (Low Power ~ 50 mW)
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STANFORD
External Quantum Efficiency –Thick Substrate
Ext.
Eff
icie
ncy
Optical Power (mW)
Bias (Volts)
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STANFORD
Damage Threshold – LLO Devices (9/23/03)
P > 2e6 W/cm2 (???)(>180 W in 100 m spot)
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STANFORD
LHO Damaged PDs –Shutter Problems (2/22/05)
Damaged Devices
Undamaged Devices “…acoustic coupling…”
-Robert Schofield
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STANFORD
LHO Damaged PDs –Shutter Problems (2/18/05)
No injected Peak at 280 Hz
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STANFORD
Rear-IlluminatedDamage-Threshold Test
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STANFORD
Front-IlluminatedDamage-Threshold Test
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STANFORD
AdLIGO Devices
DetectorPower
Stabilization
Aux. Length Sensing
GW Channel
Diameter 3 mm 1.5 mm1 mm
(or larger?)
Steady-State Power
300 mW 100 mW 50 mW
3-dB 1/RC Bandwidth
5 MHz30 MHz
( 180 MHz?)60 MHz
Quantum Efficiency
> 80 % 80 ~ 90 %
Damage Threshold
? Important?!
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STANFORD
AdLIGO Devices: Commercial Vendors
http://www.stanford.edu/~djackrel
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STANFORD
In Progress / Future Directions
Substrate removal GaInNAs(Sb) growth (w/ upgraded
system) ARC 1/f noise experiments
Successor - Zhilong Rao Packaging devices / Testing components Higher saturation power? ( RF
detection?) Surface uniformity?, Backscatter?, etc.
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STANFORD
Future Directions – What types of diodes are needed?
Quantum Efficiency? Damage Threshold? Saturation Power?
RF detection AdLIGO laser stabilization
Electronic Noise? DC RF? (180 MHz)
Frequency Response? Commercially available?
Other???
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STANFORD
XRD Reciprocal Space Map (004)
MM-InGaAs GaInNAs
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STANFORD
Surface Roughness
MM-InGaAs RMS = 6.2 nm
GaInNAs RMS = 0.8 nm
[110][-110]
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STANFORD
Optimizing Post-Growth Anneal
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STANFORD
Scanning PhotoluminescenceIntensity
InGaAs:Uniformity: 10.8%
GaInNAsUniformity: 15.9%
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STANFORD
Scanning PL Intensity Maps
InGaAs GaInNAs
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STANFORD
GaInNAs Temp. Dependent PL: Localization Energy
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STANFORD
Sample Activation Energy (eV)
Trap Density (cm-3)
CaptureCross-Section (cm2)
LM - GaInNAs0.63
1.1 x 1014 9.0 x 10-15
0.273.9 x 1013 2.5 x 10-16
0.227.5 x 1013 3.2 x 10-15
0.151.7 x 1013 5.2 x 10-18
MM - InGaAs0.47
2.0 x 1013 4.9 x 10-15
0.123.1 x 1012 3.2 x 10-12
Deep Level Transient SpectroscopyMajority Carrier Traps
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STANFORD
1 m GaInNAs Film Transmission
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STANFORD
2 m InGaAs Absorption Spectrum
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STANFORD
InGaAs vs. GaInNAs Dark I Density
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STANFORD
Dark and Photocurrent (SNR)
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STANFORD
Photovoltaic Response
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STANFORD
C-V Curves
GaInNAs: 1/RC 7 MHz
InGaAs: 1/RC 15 MHz
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STANFORD
LCR Resonant Circuit Modeling
FWHM 15 MHz
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STANFORD
Damage Threshold Tests
LIGO 1
power in each arm (W) ITM transmission Total Power on AS-PD Spot Radius (um) Area (cm2) Power Density (W/cm2)
6000 0.03 360 5.00E+01 7.85398E-05 4.58E+06
6000 0.03 180 5.00E+01 7.85398E-05 2.29E+06
20 1.178511302 4.36E-06 4.58E+06
20 1.666666667 8.73E-06 2.29E+06
AdLIGO
power in each arm (W) ITM transmission Total Power on AS-PD Spot Radius (um) Area (cm2) Power Density (W/cm2)
8.30E+05 0.03 4.98E+04 5.00E+01 7.85398E-05 6.34E+08
20 0.100200602 3.15E-08 6.34E+08