Fig. 1. Experimental setup of ips-TPG (Insert is schematic of CLN crystal structure)

Fig. 2. Tuning characteristics of THz wave and Stokes output frequency in ips-TPG

Fig. 3. Terahertz wave tuning output characteristics of ips-TPG (Inset is THz energy attenuation factors of ips-TPG)

Fig. 4. Effects of pumped energy and injected pulse seed energy on terahertz wave output characteristics. (a) THz output energy of ips-TPG under different pump energies; (b) THz output energy and threshold energy under different pulse-seed energies

Fig. 5. Energy distribution of terahertz spot

Fig. 6. Stability of THz output of ips-TPG within 30 min