finesse.locks module

Controlling an interferometer via error signals.

class finesse.locks.Lock(*args, **kwargs)

Bases: ModelElement

A simple lock which computes and applies the feedback to a given parameter using an error signal.

Parameters

namestr

Name of newly created lock.

error_signalAny

An error signal parameter or an object capable of producing a real-type error signal. This is typically a demodulated PowerDetector instance (or the name of the instance).

feedbackParameter

A parameter of the model to apply the locks’ feedback signal to.

gainfloat

Control loop gain.

accuracyfloat

Threshold to decide whether the loop is locked.

enabledboolean

If true this lock will run when the RunLocks() action is used. Explicitly specifying the name of the lock will override this setting, e.g. RunLocks(name).

offsetfloat

An offset that is applied to the error signal before it is used.

property accuracy

accuracy : float Threshold to decide whether the loop is locked.

property disabled

property enabled

enabled : boolean If true this lock will run when the RunLocks() action is used. Explicitly specifying the name of the lock will override this setting, e.g. RunLocks(name).

property error_signal

The error signal of the lock.

property feedback

A handle to the parameter which the feedback signal is applied to.

property gain

gain : float Control loop gain.

property offset

offset : float An offset that is applied to the error signal before it is used.