Experimental setup. L—lens, M—mirror, BS—beam splitter.
Design of sample holder affixed to translation stage (not shown).
Spectrum of the 415.86 nm Ar emission line obtained using 3600 mm−1 grating for determining the spectral resolution. The close up of the 415.86 Ar line is shown in the inset. Resolution is 0.01 nm, determined by the FWHM of the peak fitted with the Gaussian profile. Solid line—Gaussian fit, points—experimental data.
Experimental setup for Mach-Zehnder interferometer. DL—delay line, L—lens, M—mirror, BS—beamsplitter.
Nonlinear phase accumulation B as a function of spot size w on the sample for determining operating range for LIBS. The minimum focal spot size is w0 = 29 µm.
Focal spot beam profile. The intensity and fluence on the sample based on this beam profile per mJ of input energy are 3.5 × 1015 W/cm2 and ∼140 J/cm2, respectively.
Uranium spectrum showing the 406.25 nm, 409.01 nm, and 411.61 nm peaks, which correspond to U (II) transitions. Spectrum at −29155 fs2 (a), +8845 fs2 (b) and −72155 fs2 (c) were obtained from an average of 5 sets of 10 shots integrated over 1-s window at each phase setting.
Variation of the intensity of the 409.01 nm uranium peak for three values of residual GDD: (a) −29155 fs2, (b) +8845 fs2, (c) −72155 fs2.
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