White lasers exist

Retro

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Yes, there's such a thing and they're not even new having been demonstrated in 2011. Normally, by definition, a laser can't be white, because it consists of a single frequency, but there's a way to do it.

Here's a paper on them from 2015:

Semiconductor lasers are capable of emitting over the full visible color spectrum, which is necessary to produce a white laser, researchers have demonstrated. The technological advance puts lasers one step closer to being a mainstream light source and potential replacement or alternative to light emitting diodes (LEDs). Lasers are brighter, more energy efficient, and can potentially provide more accurate and vivid colors for displays like computer screens and televisions.

Now, if only it was possible to get one of those pen lasers in white that would be something. Maybe we will one day.

 
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