[dtgriscom]

That picture of the wafer with a rainbow of shapes is very misleading. It suggests that the various colors you see on the chip is the various colors the lasers can emit, which is wrong; it's just diffraction, and has nothing to do with the topic of the article. (But, PR people gotta PR...)

[protontypes]

In fact, regular tunable wavelength lasers do work with diffraction gratings. https://www.edmundoptics.com/knowledge-center/application-no...