For a different kind of lasers, take materials science to work on diode lasers. Materials scientists are the ones really making laser diodes, and solving all the problems to make new kinds of laser diodes work and work better. It's difficult, but very rewarding.
I got my undergraduate in materials, and I am now starting on my Ph.D on a full ride + generous stipend in one of the top 5 materials programs in the country. For my research, I am working on the next generation of gallium nitride laser diodes, true blue and green, so it's a dream come true.
There's money in engineering graduate schools. Science is tougher, but with top engineering programs like the one I'm in, companies and government pay for the research that you're doing and you get the benefit of complete payment for your graduate degree while doing research that you're interested in. And with a degree in materials science, any degree, there will always be jobs. Government and government contractors were beating down our department's doors for materials students with bachelor's degrees. Out of my graduating class in materials, every single person who wanted a job had one before even graduating, and the rest of us were accepted into our top choices of graduate schools. Materials science and engineering rocks.
You think electrical engineers or computer scientists are responsible for Moore's Law and the extreme performance of our computers nowadays? Nope, it's all materials science.