Fig. 1. Schematic diagram of CPPLN SHG process

Fig. 2. Relationship between the inverted lattice vector of the designed CPPLN and the effective nonlinear and relationship between temperature and phase mismatch

Fig. 3. Correlation diagrams of CPPLN SHG experiment. (a) Device schematic diagram; (b) the shape of the fundamental wave; (c) the spectrum of fundamental wave and second-harmonic wave

Fig. 4. CPPLN SHG experimental results. (a) Relationship between temperature and SHG power; (b) comparison of SHG efficiency between CPPLN and LBO at the optimum temperature

Fig. 5. Relationship between SHG power and temperature of different SHG crystals. (a) CPPLN; (b) LBO

Fig. 6. Relationship between temperature and SHG conversion efficiency of CPPLN with different duty cycles. (a) 49.60%; (b) 49.61%; (c) 49.62%; (d) 49.63%

Fig. 7. Comparison of output spots of CPPLN and LBO SHG experiments. (a)-(d) Output spots of CPPLN at 21 ℃, 25 ℃, 29 ℃, and 33 ℃, respectively; (e)-(h) output spots of LBO at 15 ℃, 19 ℃, 23 ℃, and 27 ℃, respectively

Fig. 8. Fitting curves of CPPLN output spot intensity distributions. (a) 21 ℃; (b) 25 ℃; (c) 29 ℃; (d) 33 ℃