[highlight]Multiline argons emit several wavelengths as one 488nm beam[/highlight]
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[highlight]Multiline argons emit several wavelengths as one beam, which can be split via prism into their individual wavelengths.[/highlight]
One common misconception here is that argon is '488nm'. But a multiline is a bunch of different lines all coming out as one, and while this beam contains 488nm light, it cant be considered a 488nm beam.