Day 24

Today I worked more on the code I wrote -- the Probe beam path code and CCD camera code. I made a start button for the CCD camera code so users can just click the button to gather images. I was still checking my spot size code. They looked right. I also found an extension in Matlab which can easily change my script into an application.

I added the right-most extension ("CCD camera triggering"):

Day 23

Today was a work day! I worked all day on my presentation slides, and I updated almost every slide. As Dr. Qiao suggested, I added more diagrams and explanations to make my presentation more clear to listeners from different knowledge backgrounds. It was a tough process to find relevant images for each slide. Sometimes I had to draw a whole diagram myself. Since I changed some diagrams, I had to rewrite my equations on Latex. I also made more specific about what I had done this summer.

It's pouring rain outside ...

Day 22

Dr. Qiao came to the lab this morning and I showed her my CCD camera software and script on Matlab. Dr. Qiao said that we should sync the delay line and CCD camera, so a computer can control the both the delay line and CCD camera at the same time. Since we didn't have any code to control the delay line, I sent an email to Thorlabs to see if they have any good idea. I also added a simple slide to explain the basic principle of my project.

In the afternoon, I went to RIT Undergraduate Symposium with my brother and Zihao. We listened to all the presentations in the Mathematical science section. Staffs like stress-concentration coupling, spiral waves, and critically packed spherocylinders were really intriguing. After all the four presentations, we finished all the posters. One interesting project was to investigate the use of arrows in mathematics and science. I also went to posters about Quantum Turing Machine (Qubit).

Finally, I worked on making CCD routine more automatically. In addition, I updated my code so it became more user-friendly.

Day 21

I had a meeting with Dr. Qiao today, and Dr. Qiao gave me some great suggestions on my presentation slides.

I finished my ABCD law Matlab code today. Finally, I got a spot size that was very close to the result got from the previous method (5.244824842569mm compare to  5.171716695698mm).  Since I found the beam size was too large to reach the objective diameter, I calculated the original beam size which could fit the objective. In order to find the incident radius, I wrote a very very long equation. Surprisingly, Matlab actually solved it. The answer was a little bit impossible; it was even smaller than the beam size when the beam emitted from the laser box.  However, we can actually change the answer by decreasing the distance between the objective and the sample. 

Day 20

I learned ABCD law today and I was trying to write code for probe beam's path in Matlab; I think this is a good way to double check my calculations. Although I knew how to do matrixes multiplications, I'm not sure how to get spot size.

I was checking camera's exposure again today. I could see the light integrated during a certain exposure time on the images collected. But I couldn't tell the shape of the object. I think there exists a transition time between the light on and off, which caused the decreasing of resolution.

In dark:

Short moment with the light on during exposure time:

 A good news is that Dr. Qiao came back and I'll have a meeting with her tomorrow.

Day 19

I invited Zihao last night, and Zihao actually came this morning. Gerry and I introduced our projects to Zihao, and he seemed very interested in what we are working on this summer ... ...

I asked Lauren my confusion left yesterday and I found that I forgot to consider the diameters of the lenses. After recalculation, I got very close resolutions for the two lenses. Cayla helped to check my calculations today and we didn't find any obvious mistakes in my code. I also looked up convolution and edited my presentation slides a little bit. 

I looked back to Fourier Transform today, and I think I'll work more on Pump-Probe tomorrow.

Day 18

Almost forgot tomorrow I can bring a friend. I've contacted a past year intern -- not sure whether he would like to come.

It's Monday today so I felt hard getting up this morning (even forgot to set the alarm). I majorly worked on double lens system today. I did some researches on the double lens system. Basically, I needed to solve equations for each lens separately. I put another convex lens between objective and camera to display the whole object in the small CCD sensor.

Lauren left me two different convex lenses. She said I could pick one and she gave me a hint related to the resolution of the image. So I looked up resolution limitation of the lenses. It looks like according to two equations, the longer the focal length, the smaller the NA,  and higher the resolution. I will ask Lauren whether this is correct tomorrow. Even though I thought I should use the longer focal length one, I still used the small one with lower f, since it was much easier to adjust the height and position.