Optimizing the output power of CW Ti:sapphire laser by stable region analysis and adjustment impact observation

With the in-depth research on light-atom interaction, there is a demand for improved performance in output power, noise, beam quality, stability and tunability of continuous-wave Ti:sapphire lasers. Based on the ABCD matrix model and combine with the latest numerical simulation results of Ti: sapphire crystal, the effect of cavity parameters on the stable region of the four-mirror ring resonant cavity is analyzed, and the output characteristics of the Ti:sapphire laser under different pump spot sizes, transmittance of output coupler mirrors, and pump power are measured and discussed. The experimental discovery of a “double-peak” power phenomenon is attributed to the movement of the pump focusing mirror, which is caused by variations in the focusing positions of the pump beam along the x and y directions within the crystal. This work further confirms the correlation between the optimal transmittance of output couplers and the applied pump power. By applying the “3σ” criterion and assessing class A uncertainty in our measurements, we ensure the reliability of our findings and offer valuable insights for the design optimization of tunable Ti:sapphire lasers, contributing to the advancement of laser technology in precision research.