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‘ unexpected ’ problems

‘ unexpected ’ problems. 1) Second-order fluctuations. Non-linearity. If is small the linearization works Otherwise the second order expansion has to be used . Non-linearity. Simultaneous acquisition of time series of Output field intensity PDH signal.

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‘ unexpected ’ problems

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  1. ‘unexpected’ problems 1) Second-orderfluctuations

  2. Non-linearity If is small the linearization works Otherwise the second order expansion has to be used

  3. Non-linearity • Simultaneous acquisition of time series of • Output field intensity • PDH signal Non linearized with optical resonance’s transfer function Intensity PSD (W2/Hz) Direct Derived from PDH signal Frequency (Hz)

  4. ‘unexpected’ problems 1) Second-orderfluctuations Solution: - higher input couplertransmission (lower Finesse) - cleanerspectrum (low frequencymechanicalmodes are important) 2) Dynamicinstabilityof ‘light’ modes at low frequency (within or closeto the lockingbandwidth)

  5. The problemconcerns QPO oscillators, but WHEEL oscillatorshavelower Q

  6. ‘unexpected’ problems 1) Second-orderfluctuations Solution: - higher input couplertransmission (lower Finesse) - cleanerspectrum (low frequencymechanicalmodes are important) 2) Dynamicinstabilityof ‘light’ modes at low frequency (within or closeto the lockingbandwidth) Solution: - new QPO withlow-frequencymodesup-shifted - new WHEEL oscillatorswithbalancednodalsuspension (enhancedde-couplingfrom the background and increased Q

  7. New QPO

  8. New WHEEL

  9. New WHEEL

  10. Publishedworkswithacknowledgementto the PRIN

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