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Cascaded Čerenkov third-harmonic generation in random quadratic media
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Phase contrast image of a polydomain crystal looking through the surface perpendicular to the c-axis. (b) Experimental photograph of the TH and SH conical emission at 1600 nm input wavelength. (c) Power of the third harmonics vs. the input power of the fundamental beam. Solid line represents a cubic fit.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Diagram of the longitudinal phase matching for cascaded third-harmonic generation. Δk and Δk′ are the corresponding phase mismatches. (b) Measured TH opening angle over a wide wavelength range. The solid curve represents the numerical calculations.

Image of FIG. 3.
FIG. 3.

(Color online) Experimental photographs recorded for different output polarization angles of the third harmonic wave. (a) to (c) 0°, 45°, and 90°, respectively.

Image of FIG. 4.
FIG. 4.

(Color online) Experimental photographs (top row) recorded for different input polarization angles of the fundamental wave. (a) to (c) ϕ 0 = 0°, 44°, and 92°, respectively. (middle row): The corresponding azimuthal intensity profiles. (bottom row): Numerical simulations of the azimuthal intensity distribution for large domains (marked with vertical-dashed lines) and small domains (non-marked). The absolute THG intensity for small domains is about two orders of magnitude smaller than for large domains.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Cascaded Čerenkov third-harmonic generation in random quadratic media