50 W Laser Concepts for Initial LIGO
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1 50 W Laser Concepts for Initial LIGO Lutz Winkelmann, Maik Frede, Ralf Wilhelm, Dietmar Kracht Laser Zentrum Hannover LSC March 05 Livingston G Z
2 Overview: Two concepts for a 50W laser for initial LIGO Conceptional design Experimental Setup Presentation of computational and measured data Comparison of both concepts Summary
3 First Concept High-Power Nd:YAG Multi-Pass Amplifier
4 First Concept High-Power Nd:YAG Multi-Pass Amplifier - water-cooled rod mount - 40 mm Nd:YAG 0.1at.% doped crystal with 7 mm undoped end caps on both sides laser-head with: - 10x400 µm fibers each 30 W - pump light homogenizer - pump light optics
5 Single-Pass Output Power 30 Calculated Data 25 1W Input 6.3W Input 9W Input output power (W) pump power (W) max. estimated output power 26.5W
6 Single-Pass Output Power 30 Experimental Data output power (W) W 6.3W 9W 1W 6.3W 9W Input pump power (W) max. measured output power 26.1W
7 Single-Pass Gain 5 4 Calculated 300W pump 163W pump power single-pass gain seed power (W) max. estimated small signal gain of 300W pump power
8 Single-Pass Gain 5 4 Experimental 300W pump 163W pump 300W pump 163W pump power single-pass gain seed power (W) max. measured small signal gain of 300W pump power
9 Double-Pass Output Power Calculated 1W 6.3W 8.2W Input output power (W) pump power (W) max. estimated output power 300W pump power
10 Double-Pass Output Power 35 Experimental Data output power (W) W 6.3W 8.2W 1W 6.3W 8.2W Input pump power (W) max. measured output power 315W pump power
11 Double-Pass Gain Calculated Data W pump 163W pump power double-pass gain seed power (W) max. estimated small signal gain of 300W pump power
12 double-pass gain Double-Pass Gain Experimental 300W pump 163W pump 300W pump 163W pump power seed power (W) max. measured small signal gain of 300W pump power
13 Second Concept Nd:YVO 4 4 Rod Amplifier
14 Experimental Setup Nd:YVO 4 Laser Amplifier
15 Experimental Setup Nd:YVO 4 Laser Amplifier - passively cooled crystal mount - 8 mm Nd:YVO 4 rod with 2 mm undoped end cap - first experimental setup for single-pass measurements
16 Single-Pass Output Power Calculated 14W seed 10W seed power output power (W) pump power (W) max. estimated output power 10W seed power
17 Single-Pass Output Power Experimental 14.5W seed 10W seed 14.5W seed 10W seed power output power (W) pump power (W) max. measured output power 10W seed power
18 Single-Pass Gain 5,5 5,0 Calculated 30.5W pump power 4,5 4,0 single-pass gain 3,5 3,0 2,5 2,0 1,5 1,0 0,5 0, seed power (W) max. estimated small signal gain of 30.5W pump power
19 Single-Pass Gain 5,5 5,0 4,5 Experimental 30.5W pump 30.5W pump power 4,0 single-pass gain 3,5 3,0 2,5 2,0 1,5 1,0 0,5 0, seed power (W) max. measured small signal gain of 30.5W pump power
20 Simulation of a 4 Rod Amplifier Amplifier with multiple single-pass rod cascade P in = 10W 60 output power (W) single rod amplifier double rod amplifier triple rod amplifier quadruple rod amplifier pump power per crystal (W) estimated output power 125W pump power
21 Comparison of Both Concepts Nd:YAG Amplifier Nd:YVO 4 Amplifier Single-pass output power at 10W seed power: 26.1W 17.9W Single-pass opt.-opt. efficiency: Depolarization compensation: Mechanical design: 8.3% in single-pass operation at 315W pump power thermal birefringence => compensation required water-cooled rod mount 26% in single-pass operation at 30.5W pump power Estimated efficiency of 40% for 4 rod cascade natural birefringence => no compensation necessary passively cooled rod mount
22 Summary Both concepts seems to be suitable for the 50W initial LIGO laser More experimental measurements and simulations have to be performed to make a final decision
23 Beam Profile Measurements Seed source Full pumped amplifier
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