Output characteristics of an intracavity-pumped dual-wavelength narrow-linewidth laser with reabsorption losses

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.