零声子线泵浦全国产Yb:YAG碟片激光器OA

[Background]Yb:YAG thin-disk lasers are promising high-power solid-state laser sources because the thin-disk geometry enables efficient heat removal and suppresses thermal lensing.However,the small disk thickness limits single-pass pump absorption,and multi-pass pumping is required.Zero-phonon-line pumping near 969 nm can further reduce the quantum defect and thermal load compared with conventional 940 nm pumping.[Purpose]This study aims to develop an all-domestic high-power and high-efficiency Yb:YAG thin-disk laser based on a self-developed disk crystal and a 56-pass pump module,and to experimentally verify its output performance and thermal characteristics under high-power continuous operation.[Methods]Firstly,a high-power thin-disk laser system was built using a self-developed 10%-doped,130-μm-thick Yb:YAG disk crystal and a self-developed 56-pass pump module.Secondly,the single-pass absorption rates at 940 nm and 969 nm were measured,and the cumulative absorption after 56 passes was estimated.Thirdly,a V-shaped resonator with the same cavity structure,output coupler and cooling conditions was used for both pump wavelengths,and the disk surface temperature,output power and optical-to-optical efficiency were measured.[Results]Under the same pump power density,969 nm pumping showed lower disk temperature and higher optical-to-optical efficiency than 940 nm pumping.At 4.7 kW/cm2,the maximum surface temperature was 72℃for 969 nm pumping and 80℃for 940 nm pumping.With 969 nm pumping,the system achieved 906 W multimode output at 1 300 W pump power,with a maximum optical-to-optical efficiency of 69.7%,compared with 62%for 940 nm pumping.[Conclusions]The results show that the 56-pass pump module enables nearly saturated pump absorption,and 969 nm zero-phonon-line pumping reduces thermal load and improves efficiency.This work provides an experimental basis for all-domestic Yb:YAG thin-disk laser systems.