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Ponderomotive rotator: requirements

Ponderomotive rotator: requirements. Zach Korth (Caltech) – GWADW ‘12 – Waikoloa, HI. The optomechanical advantage. Simple cavity: interference between optical pathways produces amplitude/phase shifts

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Ponderomotive rotator: requirements

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  1. Ponderomotive rotator: requirements Zach Korth (Caltech) – GWADW ‘12 – Waikoloa, HI

  2. The optomechanical advantage • Simple cavity: interference between optical pathways produces amplitude/phase shifts • Optomechanical cavity: Added pathway through mechanical system  modification of dynamics Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  3. Optomechanical dynamics Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  4. Optomechanical dynamics Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  5. Sideband cooling • Upshifted SB is resonant  • Cooling limit:  want Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  6. OMIT • Introduce second, “probe” beam at • Produces radiation pressure force at laser beat frequency, Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  7. OMIT • RP force excites mechanical oscillator • As it cools, it scatters a photon up by Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  8. OMIT • Optomechanical coupling rate: • To preserve quantum state, must have Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  9. OMIT as a rotator FI squeezing  FD squeezing  Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  10. Thermal noise FI squeezing  FD squeezing  SIGNAL NOISE Pump detuning  Rotation frequency  Thermal force spectrum Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  11. Thermal noise Need Or, Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  12. Solutions? • One idea: optical dilution Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

  13. The End • ANYONE HAVE ANY IDEAS? LET US KNOW! • Acknowledgements • Haixing Miao • Thomas Corbitt • Amir Safavi-Naeini (O. Painter group, CIT) • References: • Weis, et al., “Optomechanically induced transparency,” Science330 (6010), 2010 • Safavi-Naeini, et al., “Electromagnetically induced transparency and slow light with optomechanics,” Nature 472, 2011 • Corbitt, et al., “Optical Dilution and Feedback Cooling of a Gram-Scale Oscillator to 6.9 mK,” Phys. Rev. Lett.99 160801 (2007) Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568

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