Scientists invent 2D Twist Boron Nitride (TBN) optical crystal for next-generation laser

https://phys.org/news/2024-01-scientists-ultrathin-optical-crystal-generation.html 

"laser generated by optical crystals marching column of photons whose direction and pace highly coordinated by twist mechanism improving energy conversion efficiency 100 - 10,000X... TBN crystal's thickness range 1 to 10 µm... 3rd phase-matching theory based on light-element material system... frequency conversion, parametric amplification, and signal modulation... quantum light sources, photonic chips, AI"

Related: Engineers produce the world's first practical Titanium-sapphire laser on a chip
https://phys.org/news/2024-06-world-titanium-sapphire-laser-chip.html