Implantation of an accommodating intraocular lens in an eye may require the accurate measurement of the size, circumference, or diameter of the capsular bag of the eye. In the catalyst Mn+ is preferably Ag+, Cu+, Ga3+, Sc3+, Lu3+, Ho3+, Tm3+, Yb3+ or Hf4+. The damper wires and the shadow mask are configured such that a first order natural frequency of vibration of the damper wire falls outside a range within 10% of a third order natural frequency of vibration of the shadow mask. A 180\xb0 out-of-phase copy of the desired RF output signal is also supplied to the combinersplitter.