finesse_40m.noise_projections module

finesse_40m.noise_projections.get_short_michelson_quantum_noise(model_in, freq_low=0.3, freq_high=10000.0, npoints=1000, interpolate=True, interpolate_kw_args={})

Get the frequency quantum noise for a short Michelson interferometer.

This function computes the quantum noise of a short Michelson interferometer by applying differential motion to the input test masses (ITMX and ITMY) and measuring the resulting power at the anti-symmetric (AS) port. The AS port is assumed to be represented in the Finesse model by a Nothing called “AS_port”. The function creates a deep copy of the input model to ensure no modifications are made to the original.

Parameters

model_infinesse.Model

The Finesse model representing the optical setup of the short Michelson interferometer. This model should include definitions for the test masses ITMX and ITMY, and a “Nothing” component named “AS_port”.

freq_lowfloat, optional

The lower bound of the frequency range (in Hz) for the response calculation. Default is 0.3 Hz.

freq_highfloat, optional

The upper bound of the frequency range (in Hz) for the response calculation. Default is 10,000 Hz.

npointsint, optional

The number of frequency points to compute the response over the specified range. Default is 1000.

interpolatebool, optional

Whether to return an interpolated function of the response. If True, the function returns a scipy.interpolate.interp1d object for efficient querying of the response. Default is True.

interpolate_kw_argsdict, optional

Additional keyword arguments to pass to the scipy.interpolate.interp1d function. For example, fill_value can be specified to handle out-of-bound queries. Default is an empty dictionary.

Returns

scipy.interpolate.interp1d or tuple

If interpolate is True, returns a scipy.interpolate.interp1d object that provides the interpolated response as a function of frequency. If interpolate is False, returns a tuple (frequencies, responses) where: - frequencies is a numpy array of frequency points (in Hz). - responses is a numpy array of the response magnitudes (in Watts).

Notes

• The function generates a deep copy of the input model_in to ensure the original model remains unchanged.

• A Finesse script is parsed into the copied model to configure the differential drive of ITMX and ITMY and set up the power detection at the AS port.

• Interpolation is provided for convenience when precise frequency queries are required outside the original sampled frequencies.

finesse_40m.noise_projections.get_short_michelson_response(model_in, freq_low=0.3, freq_high=10000.0, npoints=1000, interpolate=True, interpolate_kw_args={})

Get the frequency response of a short Michelson interferometer.

This function computes the response of a short Michelson interferometer by applying differential motion to the input test masses (ITMX and ITMY) and measuring the resulting power at the anti-symmetric (AS) port. The AS port is assumed to be represented in the Finesse model by a Nothing called “AS_port”. The function creates a deep copy of the input model to ensure no modifications are made to the original.

Parameters

model_infinesse.Model

The Finesse model representing the optical setup of the short Michelson interferometer. This model should include definitions for the test masses ITMX and ITMY, and a “Nothing” component named “AS_port”.

freq_lowfloat, optional

The lower bound of the frequency range (in Hz) for the response calculation. Default is 0.3 Hz.

freq_highfloat, optional

The upper bound of the frequency range (in Hz) for the response calculation. Default is 10,000 Hz.

npointsint, optional

The number of frequency points to compute the response over the specified range. Default is 1000.

interpolatebool, optional

Whether to return an interpolated function of the response. If True, the function returns a scipy.interpolate.interp1d object for efficient querying of the response. Default is True.

interpolate_kw_argsdict, optional

Additional keyword arguments to pass to the scipy.interpolate.interp1d function. For example, fill_value can be specified to handle out-of-bound queries. Default is an empty dictionary.

Returns

scipy.interpolate.interp1d or tuple

If interpolate is True, returns a scipy.interpolate.interp1d object that provides the interpolated response as a function of frequency. If interpolate is False, returns a tuple (frequencies, responses) where: - frequencies is a numpy array of frequency points (in Hz). - responses is a numpy array of the response magnitudes (in Watts).

Notes

• The function generates a deep copy of the input model_in to ensure the original model remains unchanged.

• A Finesse script is parsed into the copied model to configure the differential drive of ITMX and ITMY and set up the power detection at the AS port.

• The response is computed as the power at the AS port normalized by 0.5 to account for the differential drive amplitudes.

• Interpolation is provided for convenience when precise frequency queries are required outside the original sampled frequencies.