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Some features of NV.

Some features of NV. Vincent Loriette. NV main objectives. Evaluate the effect of imperfections on the shot-noise limited sensitivity. Fix some tolerances. Find free parameters optimal values (modulation depth, démodulation phase, etc.). NV main features.

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Some features of NV.

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  1. Some features of NV. Vincent Loriette

  2. NV main objectives • Evaluate the effect of imperfections on the shot-noise limited sensitivity. • Fix some tolerances. • Find free parameters optimal values (modulation depth, démodulation phase, etc.)

  3. NV main features • All optical parameters can be varied. • Free mirror shapes. • Free orientation and shape of the incident beam. • Free modulation amplitude and frequency. • … • Fields are represented as finite sums of HG functions (no FFT). • Fast code. • No diffraction in free space. • Not suited to work with exotic beam shapes. • Optimization steps use realistic error signals. • Realistic resonnance and antiresonnance seeks. • Not necessarilly optimal (in the math sense).

  4. Computation example : north arm refectance ORFP_n=ORni_o+OTni_i*inv(OId-exp(-i*phi_n)*OFPn)*(OPna*ORne_i*OPna*exp(-i*phi_n))*OTni_o; Edges diffraction Airy peak,… Mode réfléchi Mode incident Roughness indiced mode coupling

  5. Effects of heating North arm reflectance without… and with thermal effects (stable)

  6. NV main window Various optimizations can be performed Each optical parameter can be associated with an experimental measurement datafile

  7. Result window : north arm example

  8. Result windows : beam example

  9. Output beam shape (before OMC)

  10. Sensitivity & modulation

  11. Typical results

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