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Laser Dye Performance

Laser Dye Performance. Jaqueline Mena University of Hawai’i- Hilo W.M. Keck Observatory Mentor: Kenny Grace Advisor: Jason Chin Funding provided through the Center of Adaptive Optics, a National Science Foundation Science and Technology Center (STC), AST-987683

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Laser Dye Performance

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  1. Laser Dye Performance Jaqueline Mena University of Hawai’i- Hilo W.M. Keck ObservatoryMentor: Kenny Grace Advisor: Jason Chin Funding provided through the Center of Adaptive Optics, a National Science Foundation Science and Technology Center (STC), AST-987683 Photo Credit: John McDonald, CFHT

  2. Background Information: Laser Guide Star Dye Laser Introduction: Problem Purpose Goal Experiment Set-up/Procedure Analysis Peak-to-Valley Ratios Spectral Slopes Dye Concentration Measurements Results and Conclusion Acknowledgements Overview

  3. Laser Guide Star (LGS) 589nm  Excites sodium layer  Creates an artificial guide star  Allows image correction: Courtesy of W.M.Keck and UCLA Background Photo: http://www.kaunana.com/Default.aspx?tabid=62

  4. Basic Dye Laser

  5. Layout: Keck’s Laser DMODye Master Oscillator 6 Yag Lasers Yttrium Aluminum Garnet

  6. Problem The observatory presently has no method for determining when its laser dye should be changed to maintain the laser guide star’s performance. Old dye can cause down time on the laser for several nights. Old dye… …new dye, see our problem? R2 Perchlorate Dye dissolved and diluted in Ethanol

  7. Old DMO Dye • Output power was 9 wattsAfter the dye was replaced… • Output power was 18 wattsThis means… • The laser is twice as efficient with the new dye

  8. Purpose To find consistent characteristics in old dyes’ spectra that will help determine when the dye should no longer be used.

  9. Goal To create a specific procedure for analyzing laser dye samples, and to identify the spectral features that change most with dye age and overexposure . Steve Doyle holding up a small sample of old dye

  10. Experiment • Four Dye Samples:New Dye,Dye with 200 hours of use,Old Amplifier (Amp) dye (unknown exposure time), andOld Dye Master Oscillator (DMO) Dye (unknown exposure time)

  11. New Dye • 200 Hr. Dye • Old Amp Dye • Old DMO Dye

  12. Peak-to-Valley Subtractions Subtracted: B-A, B-C, D-E, F-G D F G B A E C DMO Amp200 HrNew

  13. Old DMO Old Amp 200 Hr. New • New Dye • 200 Hr. Dye • Old Amp Dye • Old DMO Dye

  14. New Dye • 200 Hr. Dye • Old Amp Dye • Old DMO Dye 11% 89% 127%

  15. Concentration Measurements • New Dye: 0.22678 • 200 Hr. Dye: 0.226780% • Old Amp Dye: 0.1385839% • Old DMO Dye: 0.1488734%

  16. Results and Conclusion • Dye should be changed when the bar graph of the peak-to-valley subtraction calculations changes in pattern compared to the new dye. • Dye should be changed when the slope changes by more than 30% of the original.

  17. Results and Conclusion • Dye should be changed when the graph’s peak at 546.69nm drops by 30% • Dye should be changed when the concentration drops by 30%

  18. Acknowledgments Center for Adaptive Optics Sarah Anderson Lisa Hunter Scott Seagroves Hilary O’Bryan Internship short course staff My internship peers Everyone at W.M. Keck Observatory Taft Armandroff Kenny Grace Ron Mouser Kathy Muller Steve Shimko Jason Chin University of Hawai’i at Hilo Institute for Astronomy Thank YOU for your time and support! Funding provided through the Center of Adaptive Optics, a National Science Foundation Science and Technology Center (STC), AST-987683

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