ponderomotive rotator: requirements
DESCRIPTION
Ponderomotive rotator: requirements. Zach Korth (Caltech) – GWADW ‘12 – Waikoloa, HI. The optomechanical advantage. Simple cavity: interference between optical pathways produces amplitude/phase shifts - PowerPoint PPT PresentationTRANSCRIPT
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PONDEROMOTIVE ROTATOR: REQUIREMENTSZach Korth (Caltech) – GWADW ‘12 – Waikoloa, HI
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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
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Optomechanical dynamics
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
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Optomechanical dynamics
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
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Sideband cooling
Upshifted SB is resonant Cooling limit: want
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
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OMIT
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
Introduce second, “probe” beam at Produces radiation pressure force at
laser beat frequency,
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OMIT
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
RP force excites mechanical oscillator As it cools, it scatters a photon up by
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OMIT
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
Optomechanical coupling rate:
To preserve quantum state, must have
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OMIT as a rotator
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
FI squeezing FD squeezing
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Thermal noise
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
FI squeezing FD squeezing SIGNAL
Pump detuning Rotation frequency
Thermal force spectrum
NOISE
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Thermal noise
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
Need
Or,
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Solutions?
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
One idea: optical dilution
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The End
Zach Korth - GWADW 2012 - Waikoloa, HI - G1200568
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,” Science 330
(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)