Fig. 1. Slab crystal diagram

Fig. 2. Relationship between gain and number of amplifications

Fig. 3. Equivalent cavity with thermal lens in y-z plane

Fig. 4. Spot after shaping pump light by ZEMAX software

Fig. 5. Simulation results. (a) Importing the ZEMAX laser source into the COMSOL model; (b) temperature field distribution of slab crystal

Fig. 6. Focal lengths of the Nd∶YVO₄ slab crystal thermal lens with different pump powers

Fig. 7. Spherical aberration coefficient changes after the seed light passes through lens with positive spherical aberration

Fig. 8. Design of Innoslab amplifier based on spherical aberration self-compensation

Fig. 9. Optical pathway of the Innoslab amplifier is simulated by ZEMAX

Fig. 10. Diagram of optical path structure of laser system

Fig. 11. Schematic diagram. (a) Heat sink structure of Innoslab amplifier; (b) double sides welding of slab crystal

Fig. 12. Mode-locked pulse sequence diagram of oscillator

Fig. 13. Overlap area between the seed light of Innoslab slab amplifier and slab crystal. (a) Six-passing slab amplifier; (b) eight-passing slab amplifier

Fig. 14. Relationship between pump power and output optical power

Fig. 15. Pulse width curve of Innoslab amplifier

Fig. 16. Output spectrum of Innoslab amplifier

Fig. 17. Beam quality and spot profile with maximum output power of Innoslab amplifier