A Meta Reality Labs researcher puts a 2.13 arcmin floor on laser-lit 500µm waveguides

An optics researcher at Meta's Reality Labs has published a hard limit of 2.13 arcmin on how sharp a thin AR waveguide can be. According to MIXED, at the thickness glasses makers want, laser-lit 500µm waveguides fall short of the acuity target by more than a factor of two; the limit applies only to waveguides lit by a narrow-linewidth laser.

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