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AdvLIGO Laser Status

This document outlines significant advancements in the design and performance of the advLIGO laser system. It covers the optimization history, new asymmetric resonator designs aimed at improving beam quality and mode control, along with challenges such as low damage thresholds in mirror coatings. Key achievements include output power increases exceeding 150 W, refined quality inspection measures for components, and enhancements in polarization and thermal management. The future of laser design is promising, with further improvements in beam quality and output power anticipated.

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AdvLIGO Laser Status

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  1. AdvLIGO Laser Status Lutz Winkelmann, Maik Frede, Oliver Puncken, Bastian Schulz Ralf Wilhelm, and Dietmar Kracht Laser Zentrum Hannover Frank Seifert, Patrick Kwee and Benno WillkeAEI LSC March 06G060112-00Z

  2. Outline • Optimization History of the advLIGO laser • New laser design approach • Component related complications • Quality inspection measures for new components • Final results of new approach

  3. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design

  4. New ResonatorDesign

  5. New ResonatorDesign

  6. New ResonatorDesign

  7. New ResonatorDesign

  8. Better mode control mode radius pump power

  9. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design => output power »115 W • Difficulties with low damage threshold of 45° mirror coatings • Mirrors changed to high power IPG coated ones

  10. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design => output power »115 W • Difficulties with low damage threshold of 45° mirror coatings • Mirrors changed to high power IPG coated ones • Power-loss due to impurities in laser crystal material • minimal Er/Yb contamination in crystal material • decrease in output power by unknown absorption effects • higher thermal-lensing

  11. Comparison of laser crystals old and new

  12. Quality inspection measures for new components: laser crystals

  13. Quality inspection measures for new components: laser crystals Variation of up to +/-10% in doping concentration for rods from different vendors

  14. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design => output power »115 W • Difficulties with low damage threshold of 45° mirror coatings • Mirrors changed to high power IPG coated ones • Power-loss due to impurities in laser crystal material • after component (mirrors / Nd:YAG rod) change output power »125 W

  15. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design => output power »115 W • Difficulties with low damage threshold of 45° mirror coatings • Mirrors changed to high power IPG coated ones • Power-loss due to impurities in laser crystal material • after component (mirrors / Nd:YAG rod) change output power »125 W • Limitation of output power due to depolarization effects • 45° HR1064nm / HT808nm => phase shift difference for p- and s-polarization up to 30° • mirrors act as l/x-waveplates • additional depolarization losses

  16. Mirrors Old mirror with low damage threshold: phase difference 3° for s- and p-polarization

  17. Mirrors New high power mirror with IPG coating: phase difference 30° for s- and p-polarization

  18. Mirrors Mirrors actually used: phase difference 20° for s- and p-polarization

  19. Quality inspection measures for new components:mirror’s automated polarimeter polarization analysis software

  20. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design => output power »115 W • Difficulties with low damage threshold of 45° mirror coatings • Mirrors changed to high power IPG coated ones • Power-loss due to impurities in laser crystal material • after component (mirrors / Nd:YAG rod) change output power »125 W • Limitation of output power due to depolarization effects • Increased output power by use of mirrors with 20° phase shift to »150 W

  21. History • New resonator design to improve beam profile / mode control • Asymmetric resonator design => output power »115 W • Difficulties with low damage threshold of 45° mirror coatings • Mirrors changed to high power IPG coated ones • Power-loss due to impurities in laser crystal material • after component (mirrors / Nd:YAG rod) change output power »125 W • Limitation of output power due to depolarization effects • Increased output power by use of mirrors with 20° phase shift to »150 W • Improvement of locking range • Replaced front-end by 35 W Nd:YVO4 amplifier

  22. New Laser Design

  23. Injection-Locked Single Frequency Output-Power Power noise < 2.5% / h Single-frequency TEM00 output power 183 W

  24. Beam Quality Optimization of front-end to HPL mode-matching: Further improvements in output power and beam quality possible

  25. Summary and Outlook • 35 W front-end implemented • 183 W linearly polarized output power ( >200 W expected due to new mirrors ) • Beam quality M2 < 1.2 (has to be optimized) • Quality inspection measures for incoming components • Further investigation on PET mirror resonance • More accurate mode-matching of front-end and HPL

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