Fig. 1. Phasor diagram showing the harmonic net output field contributions from each segments

Fig. 2. Configuration of second harmonic generation in cascaded crystals

Fig. 3. Normalized conversion efficiency in cascaded KTP versus temperature and distance between two cascaded crystals under the undepleted pump approximation

Fig. 4. Normalized conversion efficiency versus temperature for different crystal combinations

Fig. 5. Schematic of second harmonic generation in cascaded crystals

Fig. 6. Harmonic energy versus temperature in a single KTP crystal or cascaded crystals with different distances. (a) single KTP1; (b) single KTP2; (c) cascaded crystals with distance of 13 cm; (d) cascaded crystals with distance of 9.8 cm; (e) cascaded crystals with distance of 6.5 cm; (f) cascaded crystals with distance of 3.3 cm