Now that we have safe operating temperatures, perhaps we can now properly reflect that diamond turns to graphite long before it melts by lowering safe operating temperature to around 1200K.
Second, there is a problem with non-linear crystals efficiency, specifically with Silver Gallium Selenide. You can very easily reach 100% efficiency with it, regardless of beam power, which should be impossible. Right now there is no reason not to install as many frequency doublers as the game allows and no reason to use anything but AgGaSe2. These crystals should also be subject to thermal lensing. Is this modeled in the game?
Also, now that boron was separated into two different materials, maybe it would be worth considering looking at amorphous carbon? If it is indeed diamond-like carbon, or something like that, maybe it would be worth it designating some materials, that are usually made by chemical vapor deposition, only available as coatings, i.e. very thin layers?