Fig. 1. Optical path diagram of LD pumped Nd: YAG/LBO intracavity frequency doubling green laser

Fig. 2. Focal length of the thermal lens versus pump power

Fig. 3. Relationship between spot radius and focal value of gain medium

Fig. 4. Diagram of light propagation

Fig. 5. Thermal simulation diagram at ambient temperature of 55 ^oC

Fig. 6. Output power versus pump current

Fig. 7. Variation of laser output power under 9 A current

Fig. 8. Central wavelength diagram of output laser

Fig. 9. Output beam quality and near-field beam profile of laser oscillator

Fig. 10. Output power stability curve at different temperature test points. (a) -10 ^oC; (b) 35 ^oC; (c) 45 ^oC; (d) 55 ^oC