No, this is physically not possible with the kind of laser systems we use in showlaser industry nowadays.
Every color spectrum is deflected in a different way, so if you have a multi color input, you get the colors split up as well. That's why it is physically not possible to generate a white star effect with the use of a deflection grating.
Simple grating effects are used in the very common Star Effect Lasers (like the EL-100 MICRO).
Grating effects can also be used with mirrors (BURST-10, LIN-10) and give multi-star effects.
It is possible to have a RGB star effect, but its physically not possible to do white.
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