Fig. 1. Experimental setup for white-light continuum generation

Fig. 2. Transmission curve of short pass filter

Fig. 3. Experimental setup for transient absorption

Fig. 4. Zemax simulation of focal spot of 800 nm laser beam focused by achromatic lens and ordinary spherical lens. (a) Achromatic lens with a focal length of 40 mm; (b) spherical lens with a focal length of 40 mm

Fig. 5. White-light continuum spectrum produced by a spherical lens with a focal length of 40 mm varying with incident pulse energy

Fig. 6. Comparison chart of white-light continuum spectra produced by achromatic lens and spherical lens with a focal length of 40 mm

Fig. 7. Comparison of white-light continuum spectra produced by achromatic lenses and spherical lenses with different focal lengths. (a) Achromatic lenses; (b) spherical lenses

Fig. 8. Comparison of white-light continuum spectral noise produced by different lenses. (a) Achromatic lens with a focal length of 40 mm; (b) spherical lens with a focal length of 40 mm; (c) achromatic lens with a focal length of 100 mm; (d) spherical lens with a focal length of 100 mm

Fig. 9. Transient absorption curve of rhodamine B with delay time of 1 ps. (a) Achromatic lens with a focal length of 40 mm; (b) spherical lens with a focal length of 40 mm; (c) achromatic lens with a focal length of 100 mm; (d) spherical lens with a focal length of 100 mm