Laser

The video explains that lasers produce light within a narrow frequency band, with electromagnetic waves that are coherent, meaning their peaks and troughs are in step. This coherence makes lasers particularly useful for encoding data. The term 'laser' is an acronym for 'light amplification by stimulated emission of radiation'.

Describe the relationship between the peaks and troughs of electromagnetic waves in lasers.

In what ways are lasers useful for encoding data?