Aligned pump. It is easier to align the probe before the pump. Upon scanning, we get the following signals (red is the photodetector signal, blue is the error signal): errsignal_bothpeaks_20240810_132203_Screenshot.png. You can see that the main dip has a peak in the middle (expected by the pump) although it is accompanied by some other weird peaks. The background while scanning is extremely noisy, which could  contribute to these peaks/oscillations in the dip. Additionally, the smaller transition (on the right) now has some extruding peak. A clearer view of the main peak is shown here where we are scanning across temperature: pumpprobe_20240810_130408_Screenshot.png. 

The error signal does not appear to be asymmetric. However, If you change the phase and modulation frequency, it begins to look a bit different and more asymmetric (contrast between differrsignal.png and errsignal_20240810_132122_Screenshot.png). 

One issue is the bumps when scanning temperature, which are apparent in the probe and pump. They are especially obvious when we just measure the probe (blocking the pump), as shown in probe_20240810_125659_Screenshot.png). These tiny wiggles are going to appear in the error signal so we need to find a way to remove them. 

Setup: IMG_2425.jpg