Fig. 1. Relationship between the deuteration rate of DKDP crystal and the phase mismatch

Fig. 2. Change curves of gain bandwidth with deuteration rate. (a) Deuteration rate is 0%--90%; (b) deuteration rate is 90%--100%

Fig. 3. Energy conversion efficiency in the OPA process of DKDP crystal. (a) Deuteration rate is 70%; (b) deuteration rate is 95%

Fig. 4. Time-domain waveform in OPA process of DKDP crystal. (a) Deuteration rate is 70%; (b) deuteration rate is 95%

Fig. 5. DKDP crystal with external electric field applied along the z axis (1/8 ellipsoid)

Fig. 6. Phase mismatch of DKDP crystal when different voltages are applied. (a) Deuteration rate is 70%; (b) deuteration rate is 95%

Fig. 7. Gain bandwidth variation characteristics of DKDP crystal at the center wavelength. (a) Deuteration rate is 70%; (b) deuteration rate is 95%

Fig. 8. Gain spectrum characteristics of DKDP crystal when different voltages are applied. (a) Deuteration rate is 60%; (b) deuteration rate is 70%

Fig. 9. Relationship between the center wavelength of the gain spectrum of DKDP crystals with different deuteration rates and the applied voltage