Hello All, 

I needed some help with optics design for a beam combiner setup I am working on. Essentially, I am combining two laser beam paths onto one path using a thin film polarizer. The first laser passes through a set of mirrors and lenses and a half waveplate before being incident on a thin film polarizer. The second laser follows a different beam path with a pair of mirrors and then incident on a thin film polarizer at a brewster angle of 56deg. My questions is that how can I model three different configs where I have the laser 1 path in config 1, laser 2 in config 2 and combined in config 3. Laser 1 goes through different surfaces compared to laser 2 before being incident on the polarizer so can I insert/ delete surfaces specific only to one configuration? Thanks in advance.