
And this is a high-pulse laser
with a BBO CRYSTAL.
The Big Bang Theory Season 12, Episode 22

Crystal.
Breaking Bad Season 3, Episode 11

l, uh, went back to the CRYSTAL.
Breaking Bad Season 4, Episode 7

and I damn sure didn't say
anything about no CRYSTAL.
Breaking Bad Season 2, Episode 3

It's a silicon dioxide CRYSTAL,
otherwise known as quartz.
The Big Bang Theory Season 12, Episode 2