Researchers demonstrate first visible wavelength femtosecond fiber laser

https://phys.org/news/2023-07-visible-wavelength-femtosecond-fiber-laser.html

"ruggedness/ reliability, small footprint, efficiency, lower cost and high brightness, visible pulses 10-15 fs directly... lanthanide-doped fluoride fiber. Emitting red light 635 nm, compressed 168 fs, peak power 0.73 kW and repetition rate 137 MHz... blue laser diode pump source... high-precision and quality biological tissue ablation and 2-photon excitation microscopy... cold ablation during material processing, cleaner cuts since doesn't produce thermal effects... combines lanthanide-doped fluoride fiber, blue diode pump laser"