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Finding a Piezo Resonance: Difference between revisions
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The resonant frequency of the piezo you are using is important to know in some situations. For example, if a cavity mirror has a piezo it is important to know the piezo's resonant frequency for locking purposes. Tyler green discusses this on page 34 in his [http://yavuzlab.physics.wisc.edu/pdfs/green_thesis.pdf thesis].
As an example, you might have a setup like the one shown below. Both the laser and the cavity have piezos on them. Each piezo will need to be hooked up to a function generator.
[[File:PiezoResonanceSetup.png|frameless|center|800px]]▼
[[File:PiezoResonance2.png|thumb|right|200px|Figure 3. Piezo oscillating with small sinusoidal voltage]]
[[File:PiezoResonance3.png|thumb|right|200px|Figure 4. Piezo is close to resonance, the peaks begin to oscillate with larger amplitude]]
* Ramp the laser piezo and align the cavity so that you can see transmission peaks with the photo diode (figure 2).
▲[[File:PiezoResonanceSetup.png|frameless|center|800px]]
▲[[File:PiezoResonance1.png|thumb|right|300px]]
▲[[File:PiezoResonance4.png|thumb|right|300px]]
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