1 / 10

Cavity Locking by Piezo-Driven Mirror

This study, conducted at the HAPPEX Collaboration Meeting in December 2006, focused on cavity locking using medium finesse mirrors and a piezo-driven mirror designed by Gavalya. The experiment utilized a non-tunable, low-cost laser, an electro-optic modulator, and Laselock electronics to analyze the Fabry-Perot cavity in transverse and longitudinal modes. The research assessed signals like reflection intensity, transmission, detuning parameters, and error signals, aiming to achieve stable cavity locking. While quasi-stable locking was attained, further investigations into improving resolution and stability of the piezo-driven mirror and laselock electronics are recommended. The study also emphasizes the significance of locking the Permethus laser to the cavity. Overall, the project provided valuable operational insights and proposed future experimentation with refined piezo technology.

mfrey
Download Presentation

Cavity Locking by Piezo-Driven Mirror

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related