Photonic chips that reliably convert a single color (frequency) laser into 3 new colors, for quantum computers and high-precision measurements

https://phys.org/news/2025-11-photonic-chips-passively-laser-multiple.html

"6 different chips manufactured on same wafer, from nonlinear interactions consistently generated 2nd (red), 3rd (green), 4th (blue) harmonics from incoming standard telecommunications 190 THz frequency laser... 2 timescales in resonator array of rings passively increases probability of satisfying frequency-phase matching conditions, eliminating need for embedded heaters or optimizations... integrated photonics: metrology, frequency conversion, nonlinear optical computing"