[Alex, Ian and Torrey]

We went down to the new lab with a photodiode and an oscilloscope to measure the lights and check if there were any signs of pulse width modulation. It seems that there was!

There were 3 types of lights seen downstairs, the table and optical lights which were led strip style dimmable lights, the overhead room lights, and some circular lights. 

As shown in our images below, sequentially, we tested these three sources and found the following:

• The countertop and optics table lights appeared to be using PWM at around 1 KHz. 
• The overhead lights seemed fine with a steady and small AC signal being seen on the PD at roughly 100-120KHz 
• The circular lights also seemed okay with a similar signal to the overhead lights and hitting an AC frequency near 120KHz

Overall, this seems like it may be an issue as we have shown that the lights that will be illuminating our optics table are PWM. 

See the following photos below for snapshots of the oscilloscope.