Review of Laser Guidestar Activity at LMCT CfAO

Review of Laser Guidestar Activity at LMCT CfAO

Review of Laser Guidestar Activity at LMCT CfAO Retreat: March 26, 2007 1 Agenda Update on AODP Phase 2 Objectives Delay Issues Fiber Testing Waveguide Delivery / Performance Schedule Looking Ahead Update on SFG Activities Brief update on GSK CfAO Retreat: March 26, 2007 2 Phase 2 Objectives Complete Complete Relay Relay Fiber Fiber Testing Testing 1064 1064 nm nm Power Power Milestone Milestone (83 (83 W) W) 22 Full Full Talbot-length Talbot-length WGs WGs 1319 1319 nm nm Power Power Milestone Milestone (69 (69 W) W) 33 Full

Full Talbot-length Talbot-length WGs WGs 589 589 nm nm Power Power Milestone Milestone (50 (50 W) W) Based Based on on 30% 30% conversion conversion efficiency efficiency CfAO Retreat: March 26, 2007 3 AODP Delay Issues Waveguide deliveries: The primary WG vendor has delivered over 12 WGs to specification that meet performance criteria The primary WG vendor is now also meeting schedule. Both bonded and epoxied WGs are performing Resources: Both AODP and GSK has lost key personnel in the last 3 months Due to the higher priority of GSK, Munib Jalali was pulled off of AODP Jo Bellanca (Research Scientist) now working on AODP AODP Phase 2 scheduled to conclude in September 2007. CfAO Retreat: March 26, 2007 4 Relay Fiber Testing CfAO Retreat: March 26, 2007 5

LMCT Relay Fiber Relay Fiber: 100 m Supplier Crystal Fiber T h r e s h o ld S B S P o w e r (W ) Attenuation < 8.5 dB/km NA = 0.04 2 0 0 1 0 0M H z 1G H z 5 0 0M H z 2G H z 1 6 0 T h r e s h o ld S B S P o w e r (W ) Type 12.5 m MFD solid core photonic crystal fiber (PCF) 1 0 0M H z 1G H

z 2 0 0 5 0 0M H z 2G H z 1 6 0 1 2 0 1 2 0 8 0 4 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 8 0

4 0 0 1 0 F ib e rL e n g th(m ) 2 0 3 0 4 0 5 0 F ib e rL e n g th(m ) SBS: Pth = CBAeff / gBLeff CfAO Retreat: March 26, 2007 6 CW Testing 50 mm Stanford Crystal Fiber length:

Lens = 25.4 mm Fiber attenuation: Half Waveplat e Setting (deg.) Half Waveplate Setting (deg.) 50mm Stanfo rd PPSLT 589nm CWPower (W) 84 296.0 0.750 83.4 0.3825 51% 91 290.0 1.060 83.1 0.53 50%

98 285.0 2.120 82.6 1.0176 48% 105 280.0 3.560 82.4 1.8156 51% 115 274.0 4.650 82.0 2.3715 51% 263.0 5.120 81.7 2.5088 49% Crystal

Temp (deg. C) Output fiber Coupling efficienc y m 0.0085 dB/m Linewidth: 305 MHz Fiber MFD: 12.5 micron SBS limit: 3.34 W Fiber Attenuation: 14% Fresnel Losses 14% Coupling Losses: Expected:

CfAO Retreat: March 26, 2007 100 8% 64% 7 ML Testing 50 mm Stanford Crystal 630 MHz, 430 ps pulses Fiber length: Fiber attenuation: 50mm Stanford PPSLT 589nm CW-Power (W) Crystal Temp (deg. C) Output fiber Coupling efficiency 1.800 83.4 1.188 66% 3.100 83.1 1.984 64% 4.500

82.6 2.79 62% 6.000 82.4 3.72 62% 8.500 82.0 4.93 58% 10.600 81.7 6.148 58% m 0.0085 dB/m Linewidth: 630 MHz Fiber MFD: 12.5 micron

SBS limit: 6.90 W 30 m Fiber length: Fiber attenuation: 0.0085 dB/m Linewidth: 630 MHz Fiber MFD: 12.5 micron SBS limit: CfAO Retreat: March 26, 2007 100 21.49 W 8 Conclusions Improvements to be made with regards to Fresnel losses via AR coating and fiber losses via shorter fiber. No SRS observed in these

experiements May have some SBS present at higher power levels, but we are right on the threshold Will continue tests once AODP setup is up and running again. CfAO Retreat: March 26, 2007 9 Sum Frequency Generation of 589 CfAO Retreat: March 26, 2007 10 Stanford Crystal Performance 50 mm PPSLT crystal Poling ranges from 10.6 10.9 um Several channels damaged at higher fluence levels ~ 21 J/cm2 These were the 10.6 -10.7 um channels To be cautious, we increased spot size to ~ 100 um in order to avoid damage while still generating > 10 W. CfAO Retreat: March 26, 2007 11 SFG Performance Stanford 50 mm Crystal 12.00 589nm Output Power (W) 10.00 8.00 6.00 4.00 2.00 0.00 0.00 5.00

10.00 15.00 20.00 25.00 50.00% 45.00% 40.00% 35.00% 30.00% 25.00% 20.00% 15.00% 10.00% 5.00% 0.00% 30.00 SFG Conversion Efficiency Mode-Locked SFG Performance (100um waist; 10.8um poled Channel) IR Input Power (W) 589nm Output Power (W) CfAO Retreat: March 26, 2007 SFG Conversion Efficiency 12 SFG Data vs Model 589nm Output Power (W) Mode-Locked SFG Performance (100um waist; 10.8um poled Channel) 18 16 14 12 10

8 6 4 2 0 0.00 5.00 10.00 15.00 20.00 25.00 30.00 IR Input Power (W) 589nm Output Power (W) CfAO Retreat: March 26, 2007 Modeled Power 13 Conclusions Damage to Stanford crystal at higher fluence levels needs further investigation Will perform side-by-side test of Stanford, Deltronics, and PSI crystals Will work with vendors to understand damage mechanisms & how to correct. CfAO Retreat: March 26, 2007 14

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