Ablation and optical third-order nonlinearities in Ag nanoparticles

Figures & data

Figure 1 Experimental setup for nonlinear measurements. L represents the lenses of the system, BM is a beam splitter, M1–M3 are mirrors, S is the sample, and PD1–PD4 are photodetectors with integrated filters.

Figure 2 Experimental ablation setup. L represents the focusing system of lens, BM a beam splitter, S is the sample, and PD_ref is a reference photodetector with integrated filters.

Figure 3 Self-diffraction efficiency at 355 nm and at 532 nm.

Figure 4 Linear absorption spectra after laser irradiation at different pulse durations and different wavelengths.

Table 1 Optical nonlinearities exhibited by the sample

Experiment	α (m^−1)	β (m/W)	n2 (m^2/W)	|χ^(3)| (m^2/W)
355 nm, near the resonance	1.5 × 10^2	−9.5 × 10^−10	1.6 × 10^−17	4.64 × 10^−17
532 nm, far from the resonance	20	−1 × 10^−11	2 × 10^−17	2.97 × 10^−17

Table 2 Ablation results

Single pulse experiment	40 ns 248 nm	13 ns 266 nm	7 ns 532nm	26 ps 355 nm	26 ps 532 nm
Ablation threshold (J/cm^2)	0.75	1.90	2.82	3.96	1.13