The best advice I can give you is that only you can tell how much you really like the topics after a couple of years into your degree. I did a degree specializes in photonics. I am very happy with what I have learned and am doing my MSc related to some laser products. In terms of the world market, finding a job in this field doesn't look too difficult, just need to get that first bit of experience to get things going.
One thing I would like to suggest though. You may know what your interest lies now but don't tunnel vision on it when selecting your courses. It may be a grass greener on the other side thing but in my second and third year I kept wondering if I will enjoy studying a bit more doing a more general physics or math degree that doesn't lock in my post grad options.
hope this helps...