Figure 3 | Scientific Reports

Figure 3

From: Deep-ultraviolet second-harmonic generation by combined degenerate four-wave mixing and surface nonlinearity polarization in photonic crystal fiber

Figure 3

(a) The observed output spectra when femtosecond pump pulses with center wavelength λ p of 810, 820, 830, and 840 nm and average input power P av of 650 mW (the peak power of 78 kW) are used, (b) the zoom-in spectra of the SHs generated, (c) the wavelengths λ as and λ SH of the generated anti-Stokes waves and SHs as functions of λ p, and (d) the measured output power P SH and corresponding conversion efficiency η SH of the SHs as functions of λ p.

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