Zach Notebook: Difference between revisions
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==8/23/2015== |
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1.) Pickoff efficiency is 1%. This was determined by having two photodiodes on each side of the pickoff and comparing the voltage readouts. Both reflections were focused onto the photodiode with a lens. |
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2.) Blue Photodiode 1 reads out a voltage that is 89% that of Blue Photodiode 2. This was determined by using a 50/50 (really 52/48 determined with power meter) non-polarizing beam splitter and comparing the outputted voltages. This difference could not be fixed by using the bias voltage or input current offset settings on the SRS570 amplifier. |
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==Undated== |
==Undated== |
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1.) DAQ can have voltage offsets depending on grounding setup. Make sure this is checked for different setups. |
1.) DAQ can have voltage offsets depending on grounding setup. Make sure this is checked for different setups. |
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3.) RF 3 jumps in power output every 5 dBm (i.e. at 0.0 dBm, -5 dBm, 5 dBm...). RF 1 does not. They were originally switched (RF 3 was RF 1) but we switched them because of the jump in power from the current RF 3. They are both Rohde & Schwarz SIMQ 038. |
3.) RF 3 jumps in power output every 5 dBm (i.e. at 0.0 dBm, -5 dBm, 5 dBm...). RF 1 does not. They were originally switched (RF 3 was RF 1) but we switched them because of the jump in power from the current RF 3. They are both Rohde & Schwarz SIMQ 038. |
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4.) RF generator/AOM needs to warm up after being turned on. It also needs to readjust after changing the dBm when the dBm setting is high (i.e. changing from 3 dBm to 5 dBm). |
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Revision as of 19:21, 23 August 2015
8/23/2015
1.) Pickoff efficiency is 1%. This was determined by having two photodiodes on each side of the pickoff and comparing the voltage readouts. Both reflections were focused onto the photodiode with a lens.
2.) Blue Photodiode 1 reads out a voltage that is 89% that of Blue Photodiode 2. This was determined by using a 50/50 (really 52/48 determined with power meter) non-polarizing beam splitter and comparing the outputted voltages. This difference could not be fixed by using the bias voltage or input current offset settings on the SRS570 amplifier.
Undated
1.) DAQ can have voltage offsets depending on grounding setup. Make sure this is checked for different setups.
2.) High SHG piezo voltages seem to output slightly less laser powers.
3.) RF 3 jumps in power output every 5 dBm (i.e. at 0.0 dBm, -5 dBm, 5 dBm...). RF 1 does not. They were originally switched (RF 3 was RF 1) but we switched them because of the jump in power from the current RF 3. They are both Rohde & Schwarz SIMQ 038.
4.) RF generator/AOM needs to warm up after being turned on. It also needs to readjust after changing the dBm when the dBm setting is high (i.e. changing from 3 dBm to 5 dBm).