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Ring-down Box

Application of the ring-down box

You can measure the finesse of a resonator with the ring-down box without locking the resonator!

Advantages

  1. super fast (see characterization)
  2. without locking the resonator

Measurement Method

Evaluation

Use this formula to analyse the datapoints:
y(x)=A*exp^(-x/t)+y0 with x:=time, t:= delay time

Afterwards calculate the finesse with F=2pi*t*FSR with FSR:=free spectral range.

Electronic setup

  • Electronic drawing (PDF-file)

Explanation of the operating principle

Bilder rein mit dem Kurbven etc.

List of components

  • “flipflop” (datasheet)