Fig. 1. Schematic diagram of ptychography

Fig. 2. Effect of the wavelength instability on the retrieved image

Fig. 3. MSE based on the wavelength instability

Fig. 4. Correction process for the wavelength instability

Fig. 5. Compare results of ±2 nm wavelength instability

Fig. 6. Light path of ptychography

Fig. 7. Experimental results