Fig. 1. Schematic of birefringent filter

Fig. 2. Transmittance curve of 1064 nm laser

Fig. 3. Transmittance curves of 1342 nm laser

Fig. 4. Laser experimental device diagram

Fig. 5. 593.5 nm laser output power versus pump power without BP

Fig. 6. 593.5 nm laser output power versus pump power with BP

Fig. 7. Output curves of longitudinal mode of sum frequency light. (a) 589.5 nm multi-longitudinal-mode output curves measured by 10 GHz scanning interferometer without BP; (b) 589.5 nm single-longitudinal-mode output curves measured by 10 GHz scanning interferometer with BP; (c) 589.5 nm single-longitudinal-mode output curves measured by 1.5 GHz scanning interferometer with BP

Fig. 8. Output state diagram of 1064 nm fundamental frequency light in a single-longitudinal-mode output of 593.5 nm

Fig. 9. Output state diagram of 1342 nm fundamental frequencylight in a single-longitudinal-mode output of 593.5 nm

Fig. 10. Diagram of 593.5 nm laser spot