L band (infrared)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Atmosfaerisk_spredning.png/220px-Atmosfaerisk_spredning.png)
In infrared astronomy, the L band is an atmospheric transmission window centred on 3.5 micrometres (in the mid-infrared).
In infrared astronomy, the L band is an atmospheric transmission window centred on 3.5 micrometres (in the mid-infrared).