One of the benefits of working with a talented team is that I am around a lot of knowledge, which I absorb as much as I can. Here’s a trick I learned a few months back, which I’m happy to pass along to you.
If you want to photograph a beam of light, say, from a flashlight or a laser pointer, you need something that will scatter those light rays so your eye can see it (or, more importantly, so your camera can capture it). The easiest thing to do is to get a can of compressed air, hold it upside down, and spray it behind the light. Use a tripod and a long exposure (stop down your aperture). I misplaced my remote trigger, so I simply used the timer setting on my camera so I could spray the can. Alternately, wrangle in an extra set of hands to spray that stuff.