1，IR是一种波长范围内的光线。
IR light only has enough energy to start molecules moving, not to break them apart or otherwise cause damage.
2，激光是光源的一种形式。一种特殊的光源。
LASER: light amplification by the stimulated emission of radiation.
3, what is relationship between laser and ir
One unusual form of IR radiation which can be immediately hazardous is a particular type of laser pointer.
LASER的波长有多种，但具体的一个激光只有一个波长。
Some other commonly used lasers, classified by type of lasing material, and their emission wavelengths include:
| Laser Type | Wavelength |
|---|---|
| Argon fluoride (UV) | 193 |
| Krypton fluoride (UV) | 248 |
| Xenon fluoride (UV) | 308 |
| Nitrogen (UV) | 337 |
| Argon (blue) | 488 |
| Argon (green) | 514 |
| Helium neon (green) | 543 |
| Helium neon (red) | 633 |
| Nd:Yag* (near IR) | 1064 |
| Carbon Dioxide (far IR) | 10600 |
* Neodymium-doped yttrium aluminum garnet