laser

"oscar" <

The very first laser (in 1960) produced red light using a synthetic ruby crystal.

One of the earliest gas lasers used CO2 to produce very high powered IR light for cutting metal etc.

Ever heard of Google ??

....... Phil

? eh ?

I think you need to wiki laser.

A laser is co-hereant light.

In the context of your question above, you might reword it as follows

"Is there any conenction between crayons and green? or can you have crayons in any color?

Lasers are made to produce many wavelengths. Common wavelengths for diode lasers (made with the same materials used to make IR LEDs) range from visible red (say, 635 nm) to 980 nm, then jump to about 1020 nm and go up from there to something like 1670nm.

Some references: