2024/04/23 by Meyer, Johann Gabriel, Zablah, Andrea, Pronin, Oleg
#FOS: Physical sciences #Optics (physics.optics)
paper · doi:10.48550/arxiv.2404.15202
We present here a new geometry for laser amplifiers based on bulk gain media. The overlapped seed and pump beams are repetitively refocused into the gain medium with a Herriott-type multipass cell. Similar to a waveguide, this configuration allows for a confined propagation inside the gain medium over much longer lengths than in ordinary single pass bulk amplifiers. Inside the gain medium, the foci appear at separate locations. A proof-of-principle demonstration with Ti:sapphire indicates that this could lead to higher amplification due to a distribution of the thermal load.