Sometimes a laser is used in a “pass-through” setup, which begs the question: What happens to the laser after it passes through?
Consider for example a sensitive camera that is used to profile a laser. Beam splitters are often used to deflect only a small percent of the laser intensity into the camera. The other 90% or more passes straight through the splitter.
If your application involves a laser which is not always on the target, such as the following setup, you might need a beam dump. Consider this: The deflectable mirror is used to direct the laser to its intended target