![- Is it a secret?
- No, it's a nitrogen laser.
- Is it a secret?
- No, it's a nitrogen laser.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
- Is it a secret?
- No, it's a nitrogen LASER.
The Big Bang Theory Season 6, Episode 5
![And this is a high-pulse laser
with a BBO crystal.
And this is a high-pulse laser
with a BBO crystal.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
And this is a high-pulse LASER
with a BBO crystal.
The Big Bang Theory Season 12, Episode 22
![Sheldon, I told you, I only have access
to the free-electron laser at night.
Sheldon, I told you, I only have access
to the free-electron laser at night.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Sheldon, I told you, I only have access
to the free-electron LASER at night.
The Big Bang Theory Season 2, Episode 5
![Laser demonstration's looking
pretty good now, huh?
Laser demonstration's looking
pretty good now, huh?](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Laser demonstration's looking
pretty good now, huh?
The Big Bang Theory Season 2, Episode 6
![Laser tag. Seven thousand square feet
of rollicking fun...
Laser tag. Seven thousand square feet
of rollicking fun...](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Laser tag. Seven thousand square feet
of rollicking fun...
Breaking Bad Season 3, Episode 11