Figure 4 | Scientific Reports

Figure 4

From: High-efficiency near-infrared optical parametric amplifier for intense, narrowband THz pulses tunable in the 4 to 19 THz region

Figure 4

Far-field beam profiles of the second harmonic of the signal beam for an injected signal energy of (a) 15 μJ and (b) 2.5 μJ. The spatial distributions plotted in the top and right panel are vertical and horizontal cross-sections of the beam profile along with the white dashed line. They are overlaid by a super-Gaussian fitting of order 3 (solid red line) and/or Gaussian fitting (solid green line). The range of color bars is the same for both (a) and (b). (c) Energy stability of final signal output pulses. The fluctuation of 0.7% RMS is maintained at least over 3 h.

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