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Cavity Locking by Piezo-Driven Mirror

Cavity Locking by Piezo-Driven Mirror. Botao Jia Duke University Advisor: Dr. Nanda Sirish HAPPEX Collaboration Meeting Dec 1, 2006. While the Prometheus Laser is away for fixing, we studied cavity locking with: Medium finesse mirrors Piezo-driven mirror (designed by Gavalya)

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Cavity Locking by Piezo-Driven Mirror

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  1. Cavity Locking by Piezo-Driven Mirror Botao Jia Duke University Advisor: Dr. Nanda Sirish HAPPEX Collaboration Meeting Dec 1, 2006

  2. While the Prometheus Laser is away for fixing, • we studied cavity locking with: • Medium finesse mirrors • Piezo-driven mirror (designed by Gavalya) • Non tunable, low cost laser • Electro optic modulator • Laselock electronics

  3. Fabry-Perot Cavity Basis Transverse mode Y X Z

  4. Transverse mode Video

  5. Fabry-Perot Cavity Basis Longitudinal mode Reflection Transmission 266nm Cavity length (nm)

  6. Measuring Longitudinal Mode by ScanningPiezo Voltage Eorror Signal Piezo Scan Voltage Reflection Transmission

  7. Characteristic signals of a Fabry-Perot Cavity Reflected Intensity Reflection phase Transmission Detuning Parameter phase Cavity length (nm) =532nm, Reflectivity=99.85%, Finesse  2000

  8. Measuring error signal in scan mode Reflection Error signal Transmission

  9. Experimental setup Feedback signal Quasi-stable lockinghas been achieved by using the “laselock” box in a feedback loop with the piezo driven mirror.

  10. Conclusion: • Locking is achieved. However, not very stable. Our home-made piezo doesn’t have good resolution for stable locking. • Laselock electronics performance in cavity locking need to be investigated further. So far we already gained lots of operating experience. • To try piezo with lower coefficient and higher resolution. • Now the Permethus laser is back. So to study and lock it to the cavity have the first priority. Thank you

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