Fig. 1. Experimental configuration

Fig. 2. The spectrum of SHG and variation of SH power and efficiency

Fig. 3. The power stability of SHG and remaining fundamental pulse and the beam quality of SHG

Fig. 4. The spectrum of THG and variation of TH power

Fig. 5. The spectrum of THG and variation of TH power and efficiency

Fig. 6. The beam quality and spot of THG at 343 nm

Fig. 7. The power stability of THG in 1 h