Mode-coupling Cerenkov sum-frequency-generation in a multimode planar waveguide

Abstract

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Theoretical analysis of Cherenkov third harmonic generation via two cascaded χ(2) processes in a waveguide

“…In recent years, there has been increasing interest in the study of NCR in optical materials. Varieties of research on Cherenkov second harmonic generation (SHG) [2][3][4][5][6][7], sum-frequency generation (SFG) [8][9][10][11][12] and difference-frequency generation [13] have been reported. More recently, Cherenkov third harmonic generation (CTHG) has also been experimentally realized in both quasi-phase-matched (QPM) waveguide systems [14] and bulk photonic crystal systems [15][16][17].…”

Nonlinear Cherenkov difference-frequency generation exploiting birefringence of KTP

“…In 1970, Tien et al observed the first Nonlinear Cherenkov radiation in a planar waveguide. 2 Since then, extensive works have been reported, including Cherenkov sum-frequency generation (SFG), third harmonic generation (THG), and high-order HG (HHG), [3][4][5][6][7][8][9][10] which provide a promising route to produce short-wavelength lasers and broad-band frequency converters. Besides, Cherenkov second-HG (CSHG) 11 has some applications such as optical imaging of ferroelectric domain walls.…”

Cerenkov third-harmonic generation via cascaded χ^(2) processes in a periodic-poled LiTaO_3 waveguide

“…As is known, in nonlinear optical waveguides, when the phase velocity ðṽ p Þ of the nonlinear polarization wave driven by the incident light field is faster than that of the harmonic ðṽ 0 Þ, nonlinear Cerenkov radiation (NCR) occurs via a second-order nonlinear process [1][2][3][4][5]. There are mainly two types of phase-matching configurations for NCR, the direct Cerenkov configuration and the quasiphase-matched (QPM) Cerenkov configuration.…”