Fig. 1. Equipment for crystal growth

Fig. 2. Physical maps. (a) KDP crystal; (b) some crystal plates

Fig. 3. Raman spectra. (a) Raman spectra of samples; (b) Raman peaks at 912 cm^-1 for samples

Fig. 4. Spectra. (a) Excitation spectrum of KDP crystal; (b) fluorescence spectra of samples

Fig. 5. Gauss peak separation of fluorescence spectra of samples. (a) 1# sample; (b) 2# sample; (c) 3# sample; (d) 4# sample

Fig. 6. Damage threshold and defect density calculated by Krol model. (a) 1# sample; (b) 2# sample; (c) 3# sample; (d) 4# sample