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(a) Schematic of the experimental setup with fundamental beam propagating along the domain wall. (b) Image of the spatial profiles of the Cherenkov harmonics at 2050 nm input wavelength. From the inside to the outside, the pair of harmonic wavelength are centered at 684 nm, 513 nm, and 410 nm, corresponding to the third, fourth, and fifth harmonic generation, respectively. (c) The spectrum of each order harmonic wave.
The schematic diagram displaying the phase-matching geometries of multistep cascaded Cherenkov multiple-harmonic generation. The semicircles from inner side to outer side are corresponding to the second-, third-, fourth-, and fifth-harmonic wave vectors, respectively.
(a) Evolution of recorded patterns varying with the fundamental wavelength. Plot of the experimental (signs) and calculated values (solid lines) of (b) the external radiate angles of Cherenkov third, fourth, and fifth harmonic generation and (c) Cherenkov high-order harmonic generation versus grating period (5.24, 6.92, 8.1, 10.83, 13.86, 19.47, and 30 μm).
(a) Measured intensity of the Cherenkov fifth harmonic vs. the lateral position of fundamental beam while the beam diameter is 5 μm. (b) Schematic of the fifth harmonic profile when tightly focused fundamental beam overlaps with a domain wall. Dependence of Cerenkov fourth (c) and fifth (d) harmonic power on input power at 2050 nm fundamental wavelength. Solid line represents quartic and quintic fit, while signs represent experimental data.
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