Day 5

This Morning we watched an introduction video about imaging science in the group meeting. Yesterday we planned that Henry and I would give presentations today, but the group meeting was canceled so I was able to work with Dr. Han this morning.

Yesterday we had found the position of zero time delay line, and today we would continue to the second part of the experiment. So we needed to adjust the set up of the lab a little bit. Yesterday we used BBO to detect the position where probe beam and pump beam intersect, but today we changed the BBO to the real silicon sample, which was washed at least three times by Dr. Han. Then we moved the BBO and the lens of the probe beam to a place where they would neither block the pump beam path nor change the previous path of the probe beam. After adjusting the positions, we could see that the green probe light and red pump light intersects exactly on the sample. Then we used a green light filter which only allowed green light to go through. We had to put a focus lens after the filter since the hole of CCD was very small.

After we were done with the set-up, Dr. Han gave Zhila and me some suggestions on our future work. I also derived the interferometry autocorrelation equation today; I had never thought the proof could be done by using trig operations.

Here's a picture of our new set-up: