9) Describe the down select process that led to the laser selection in more detail
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1 9) Describe the down select process that led to the laser selection in more detail David Shoemaker NSF Annual Review of the LIGO Laboratory 18 November 2003
2 Process Interested research groups pursued separate approaches to laser Adelaide, Stanford, Laser Zentrum Hannover Three collaborating groups developed joint test document Key parameters measured by traveling team to two working prototypes Adelaide not functioning due to continuing technical difficulties Round-table discussion of results at Collaboration meeting, LIGO technical management participating Choice of baseline made by subsystem leader (Uni Hannover/Max Planck) with LIGO concurrence Design pursued by Max Planck with MPI funding Would have pursued any adopted design Ended up with the MPI design Adelaide laser to be used at Gingin Stanford moving away from slab concept to fiber lasers
3 Test Plan highlights Key Questions: 1) Does the particular concept promise a successful development with high certainty? 2) Can the key technology be transferred to the system developers and manufacturers? 3) What are the potential sources of run time malfunction? 4) Can the effort that is needed to reach LIGO specs be estimated? (e.g. number of work packages, known but not yet solved problems, specialized components of limited availability or components with extraordinary tight tolerances) 5) Are there fringe benefits, e.g. a significant over-fulfillment of specs?
4 Tests to distinguish between solutions Full 1064 nm output power in main beam Pre-modecleaner (PMC) transmission/reflection actuator/error signal Single frequency operation Power Fluctuations before PMC Drift and Jitter of beam axis and other low order beam moments before PMC Polarization and polarization fluctuations before PMC Reaction of the system to deliberate, power stage pump reduction Reaction of the system to a misalignment in one or more degrees of freedom Requirements on the master oscillator power / master oscillator power drop Start up procedure and time Set up procedure/time/effort from pre-assembled parts Requirements of resources / efficiency Scaling concept Technology transfer
5 Excerpts from Lasers Working Group summary B. Willke LSC meeting, LLO March 2003
6 NoisePow ) GRMoutput Master Laser Master Injection-Locked coupler,flat ReflectingprismHorizontalmode Frequency( Laser control MHz) Nd:YAGTIRslab 10 IjtiLkdL NoisePower(dBm stable-unstable oscillator - Adelaide 100W Laser Configuration GRM output coupler, flat demonstrated 30W injection-locked stable-unstable oscillator technical problems and delays in 100W system slab is side-pumped by 520W of fibre-coupled diode lasers Reflecting prism Nd:YAG TIR slab Horizontal mode control - inhomogeneous pump light distribution / pump light fluctuations resonator is stable in the zig-zag (horizontal) direction, unstable in the vertical direction - slabs not delivered to specifications - birefringence in vertical directions max-r cylindrical mirror, convex in vertical plane Adelaide University ACIGA
7 Experimental Setup for 100W demonstration 10W LIGO MOPA System ISOL ATOR Mode-matching optics 20 W Amplifier Mode-matching optics Lightwave Electronics Output Power = 32 W Edge Pumped Slab #1 Mode-matching optics Mode-matching optics End Pumped Slab Output Power = 110 W Edge Pumped Slab #2 Pump Power = 300 W Pump Power = 420 W Output Power = 65 W Stanford High Power Laser Lab
8 High Power Locking Scheme Setup λ/2 FI output CCD PD PMC Modemaching output power: 80W Output beam λ/4 λ/2 λ/2 MISER EOM FI LZH
9 spatial profile scanning cavity transmission [a.u.] 1,2 1,0 0,8 0,6 0,4 80W LZH Laser, measured x10 x 1 transmission [a.u.] 1,2 1,0 0,8 0,6 0,4 x1 x10 0,2 0,2 0,0 0,0-0,2 cavity length -0,2 cavity length [a.u.] 12W LZH Laser, measured ,2 1,0 0,8 x1 x10 mode count locked transmission 0,6 0,4 0,2 Oscillator: T=81% T=74% MOPA: T=84% T=73% 0,0-0,2 cavity length
10 RIN GW band 10-2 RIN LZH 80W laser, 57mA photocurrent, measured behind infront 10-2 RIN Stanford MOPA, measurement behind 1 infront RIN [1/sqrt(Hz)] RIN [1/sqrt(Hz)] frequency [Hz] frequency [Hz]
11 laser power (Stanford) oscillator LZH MOPA output power 80W 65W power fluctuations (over 10s) high low RIN - GW band / RF higher order mode content similar similar fluctuations between power in higher order modes low high
12 downselect performance of MOPA / oscillator at current power levels is similar scaling concept to 200W level: risks involved in all systems most efficient choice (delays, costs) for conceptual design phase (to be performed at Laser Zentrum Hannover) is to choose injection-locked stable-rod oscillator LSC will support the MOPA / injection-locked stable-unstable development at Stanford and Adelaide as back-up solutions for the PSL
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