Will Pixy tracksense laser light?

Yes! Here's a video:

An important detail is to set the Camera Brightness parameter in the Signature Tuning tab to a low value, because the laser light will tend to be overexposed and appear white. You need to adjust the Camera Brightness down until you can clearly see the color of the laser light. You can then teach Pixy the color and it should detect the laser light very reliably.