People can’t even tell how much cheap oil is in olive oil, let alone “extra virgin olive oil” vs. el cheapo olive oil. Take it from this old laser spectrocopist. When there’s 75 mirror mounts on a 4 foot by 8 foot table, with a Chinese graduate student handcuffed to the table to adjust them, it’s at least a decade away. When you can buy a frequency comb laser on Aliexpress, now we’re talking.
Presumably they require constant high-precision adjustment and a lot of domain knowledge. I'd read it that the only way to do it now is with a high-maintenance setup and a lot of technicians.
