Simple silicon coating solves long-standing optical challenge

Re:Simple silicon coating solves long-standing optical chall... by steerablesafe on Monday November 15, 2021 @10:37AM (#29228602)

It looks like that this solution corrects for dispersion in group velocity [1], but it's unclear that it can correct for dispersion in phase velocity at the same time [2]. My intuition that the latter is not possible this way, but optics is not my field.

Correcting for dispersion in group velocity seem to have applications in pulsed-laser experimental setups (as presented), but correcting for dispersion in phase velocity would be required for correcting for the more conventional chromatic aberration people are familiar with in photography.

[1] https://en.wikipedia.org/wiki/Group_velocity [2] https://en.wikipedia.org/wiki/Phase_velocity

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Re:Simple silicon coating solves long-standing optical chall... by beervirus on Monday November 15, 2021 @10:46AM (#29228707)

Isn’t group velocity (transmission speed) what you want to fix for chromatic aberration issues?

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Re:Simple silicon coating solves long-standing optical chall... by steerablesafe on Monday November 15, 2021 @10:54AM (#29228818)

> For light, refraction follows Snell's law, which states that, for a given pair of media, the ratio of the sines of the angle of incidence θ1 and angle of refraction θ2 is equal to the ratio of phase velocities (v1 / v2) in the two media, or equivalently, to the indices of refraction (n2 / n1) of the two media.

[1] https://en.wikipedia.org/wiki/Refraction

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Re:Simple silicon coating solves long-standing optical chall... by beervirus on Monday November 15, 2021 @11:39AM (#29229312)

Huh, ok. I stand corrected.

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