Development of the first chip-sized titanium-doped sapphire laser

https://phys.org/news/2023-01-chip-sized-titanium-doped-sapphire-laser.html

"provides the widest gain spectrum yet seen on a chip... key is in laser's low threshold of about 6.5 mW, as distinguished from the >100 mW of conventional ones... atomic clocks, portable sensors, visible light communication devices, and even quantum computing chips... also compatible with the family of gallium nitride optoelectronics, which are widely used in blue LEDs and lasers"

Related:

High-performance chip-scale lasers have arrived

https://www.laserfocusworld.com/lasers-sources/article/14289450/highperformance-chipscale-lasers-have-arrived

Atomic-scale spin-optical laser: New horizon for optoelectronic devices

https://phys.org/news/2023-09-atomic-scale-spin-optical-laser-horizon-optoelectronic.html