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Enhancing Spin-Polarized Gyroscope Performance with Thin-Film Design

This study examines factors influencing the performance of spin-polarized atomic gyroscopes. The research focuses on the effects of multi-layer reflectors and fabrication imperfections on reflectance and polarization states of light. Through experimental procedures and analysis, the results highlight the importance of thin-film design in improving the reflectance and maintaining circularly polarized light within the gyroscope cells. The conclusions also address the impact of fabrication imperfections on reflectance and polarization states, showcasing the advantages of thin-film design over bulk materials.

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Enhancing Spin-Polarized Gyroscope Performance with Thin-Film Design

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  1. Study of Factors Affecting Performance of Spin-Polarized Atomic Gyroscopes Uyen Nguyen Huynh Dr. Andrei M. Shkel Max Perez Jesper Eklund Monty Rivers Ilya N. Chepurko Marc Salleras IM-SURE

  2. Outline • Introduction • Motivation • Background on Thin-film Design • Background on Polarized Light • Procedure • Results • Conclusion 2

  3. Introduction B1cos(ωat) • NMRG: Nuclear Magnetic Resonance Gyroscope • Requires circularly polarized light and high optical power • Interest: optical properties at various α Static Field Bo Cross-section of assembled NMRG* Photodiode VCSEL Drawing by Jesper Eklund * John Kitching, Elizabeth Donley, Andrei M. Shkel, E. Jesper Eklund, and Eleanor Hodby, "Compact Atomic Magnetometer and Gyroscope Based on a Diverging Laser Beam," UC Case No. 2008-002, Patent pending.

  4. NMR Cell • Coated with alternating layers of high and low indices of refraction • Filled with NMR gas 1.8mm Graphics and fabricated by Max Perez

  5. Motivation • NMR Gyroscope performance affected by: • Circularly polarized light • Intensity of reflected light • Study the effects of multilayer reflectors and fabrication imperfection on reflectance and polarization state of light 5

  6. Why Multi-Layer Thin-Film? nH*LH = nL*LL = λair/4 Air H L H L Si Image from http://en.wikipedia.org/wiki/Image:Optical-coating-2.png

  7. Polarization States Image from http://www.thorlabs.com/Thorcat/12900/12973-D02.pdf

  8. Experimental Procedure Poincare Sphere Sensor Sample ¼ Wave-Plate ½ Wave-Plate VCSEL λ = 795nm Full Cell ½ Cell

  9. Power Split Ratio • Power Split Ratio: • 0 ≤ a ≤ 1 • Phase difference: • -180o ≤ ∆ ≤ 180o • Circularly Polarized light: • a = 0.5 • ∆ = ± 90o Image from http://www.thorlabs.com/Thorcat/12900/12973-D02.pdf

  10. Test Samples • Bulk Silicon cell • 12 Si3N4-SiO2 layer cell (n = 2.0, 1.5) • 8 Si-SiO2 layer cell (n = 3.7, 1.5) • 6 Si-SiO2 layer cell • 6 Si-SiO2 layer wafer Graphics and fabricated by Max Perez 10

  11. Results of 6-Layer Cell ½ NMR Cell Sensor VCSEL 11

  12. Results of 6-Layer Wafer 6 Layer Wafer Sensor VCSEL 12

  13. Analysis Results of the 6-Layer Cell Sensor ½ NMR Cell E0x VCSEL 13

  14. Intensity of First Reflection VCSEL

  15. Results of Double Reflection Graph and samples by Max Perez

  16. Conclusion • Multi-layer thin-film design: • Improves cell’s reflectance to ~ 99% • Able to keep circularly polarized light inside cell • Fabrication imperfection: • Decreases reflectance of NMR cell • Varies phase difference significantly • Changes the polarization state of light inside cell • Improves reflectance compared to bulk Si cell 16

  17. Acknowledgements NATIONAL SCIENCE FOUNDATION IM-SURE Managing Director : Said M. Shokair Faculty Mentor: Andrei M. Shkel, PhD. MicroSystems Lab Max Perez Jesper Eklund Monty Rivers Ilya N. Chepurko Marc Salleras 17

  18. Questions?

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