Professor Williams is a really good professor for this course. Personally, I had a miserable workload for this quarter, so I wasn't able to pay as much attention to the course as I had hoped, because the material is actually interesting to me (don't take this course if you really aren't interested in semiconductor physics and E&M principles because you will hate it). The final project (presentation and paper) was pretty strict in terms of requirements (time limit, formatting, etc.), but the grading isn't particularly harsh as long as you don't miss large sections of your chosen topic. The lectures are a little bit dry, which is not the worst, but the textbook is atrocious. I managed to find a pdf and none of the equations are properly written out (slashes for division, Greek variables missing in some eqns, and missing parentheses).

Overall, if you find solar cells and semiconductor physics interesting, you'll have a decent time here. Otherwise, don't bother because the photonics series really isn't worth it for anyone who isn't very into it

Professor Williams is a phenomenal guy. He puts a lot of efforts in explaining the concepts and try his best to make everyone understood the lecture. He often uses interactive methods to explain the dauntingly difficult topics. The class had 5 HW assignment (somewhat difficult but late submission was allowed), 3 quizzes (Easy), and a review paper (on any topic related to QM) & short presentation.
I couldn't score well in the class due to personal reasons, but he graded leniently. Overall, the class was informative and engaging even to somebody like me who had no prior experience in QM. I would highly recommend this class.