Finding a Piezo Resonance - Revision history

Dcgold at 22:51, 11 June 2014

2014-06-11T22:51:23Z

← Older revision		Revision as of 22:51, 11 June 2014
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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].		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.		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.

Nbrewer at 14:56, 25 May 2014

2014-05-25T14:56:21Z

← Older revision		Revision as of 14:56, 25 May 2014
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	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.		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:PiezoResonanceSetup.png\|framed\|center\|800px\|Figure 1. Typical cavity setup]]
	[[File:PiezoResonance1.png\|thumb~~\|right~~\|200px\|Figure 2. Cavity resonance peaks]]		<!--[[File:PiezoResonance1.png\|thumb\|200px\|Figure 2. Cavity resonance peaks]]
	[[File:PiezoResonance2.png\|thumb~~\|right~~\|200px\|Figure 3. Piezo oscillating with small sinusoidal voltage]]		[[File:PiezoResonance2.png\|thumb\|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]]		[[File:PiezoResonance3.png\|thumb\|200px\|Figure 4. Piezo is close to resonance, the peaks begin to oscillate with larger amplitude]]
	[[File:PiezoResonance4.png\|thumb~~\|right~~\|200px]]		[[File:PiezoResonance4.png\|thumb\|200px\|Figure 5. Piezo is at resonance]]
			-->

	* Ramp the laser piezo and align the cavity so that you can see transmission peaks with the photo diode (figure 2).		* Ramp the laser piezo and align the cavity so that you can see transmission peaks with the photo diode (figure 2).

			* Apply a small amplitude sinusoidal voltage to the cavity piezo. Start at a very low frequency (a few hertz or so). The cavity peaks should start oscillating back and forth. If you can't see the oscillations slowly turn up the amplitude of the sine wave. Don't have the amplitude too high; a few peak widths is all you need.

			* Slowly turn up the frequency of the cavity piezo. Once you get to a high enough frequency (~30 Hz maybe) the peaks will begin to look like figure 3. You won't be able to discern an oscillation, but the peaks will remain inside the original amplitude of the sine wave.

			* When you are close to the piezo resonance, the peaks will begin to oscillate with a larger amplitude (figure 4).

			* When you get to the piezo resonance, the peaks will be completely washed out and the signal from the photodiode will just look like noise (figure 5).

			* Once you go above this frequency, you should see the peaks go back to oscillating within the original amplitude.
			<gallery caption="" widths=200px heights=200px perrow="4">
			File:PiezoResonance1.png\|Figure 2. Cavity resonance peaks
			File:PiezoResonance2.png\|Figure 3. Piezo oscillating with small sinusoidal voltage
			File:PiezoResonance3.png\|Figure 4. Piezo is close to resonance, the peaks begin to oscillate with larger amplitude
			File:PiezoResonance4.png\|Figure 5. Piezo is at resonance
			</gallery>

Nbrewer at 23:08, 23 May 2014

2014-05-23T23:08:30Z

← Older revision		Revision as of 23:08, 23 May 2014
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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].		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:PiezoResonance1.png\|thumb\|right\|200px\|Figure 2. Cavity resonance peaks]]
			[[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]]
		⚫	[[File:PiezoResonance4.png\|thumb\|right\|200px]]

			* 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:PiezoResonance2.png\|thumb\|right\|300px]]
	[[File:PiezoResonance3.png\|thumb\|right\|300px]]
⚫	[[File:PiezoResonance4.png\|thumb\|right\|~~300px~~]]

Nbrewer at 22:58, 23 May 2014

2014-05-23T22:58:43Z

← Older revision		Revision as of 22:58, 23 May 2014
Line 1:		Line 1:
	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].		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].



			[[File:PiezoResonanceSetup.png\|frameless\|center\|800px]]
			[[File:PiezoResonance1.png\|thumb\|right\|300px]]
			[[File:PiezoResonance2.png\|thumb\|right\|300px]]
			[[File:PiezoResonance3.png\|thumb\|right\|300px]]
			[[File:PiezoResonance4.png\|thumb\|right\|300px]]

Nbrewer: Created page with "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 res..."

2014-05-23T20:43:52Z

Created page with "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 res..."

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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].