Quasi-three-level dual-wavelength narrow-linewidth lasers are vital for precision applications, but reabsorption-induced energy transfer inefficiencies hinder performance, creating a critical optimization gap. This study investigates their emission characteristics under reabsorption effects, developing a theoretical model for intracavity-pumped dual-wavelength lasing that incorporates pump beam waist position. Modal dynamics and output of 912/1064 nm lasing in Nd:GdVO4/Nd:YVO4 were characterized via simulation and experiment. Optimal Nd:GdVO4 doping and geometry mitigated reabsorption, suppressing parasitic absorption and enhancing power extraction. With a pump waist at z0I = 2.5 mm, a 912 nm output reached 0.05 W with a narrow linewidth of 0.28 nm; shifting to z0II = 3 mm yielded a 1064 nm output at 0.037 W with a linewidth of 0.63 nm, and the side-mode suppression ratio of both wavelengths exceeded 30 dB. These findings guide laser system design, enhance power extraction, and hold potential for advancing precision measurement and optical communication technologies.
Liu et al. (Wed,) studied this question.