Large acceptance of non-collinear phase-matching second harmonic generation on the surface of an anomalous-like bulk dispersion medium

Abstract

We investigate several bandwidths of non-collinear phase-matching second harmonic generation, which is generated by sum-frequency of the incident and reflected wave on the inner surface of a z-cut 5%/mol MgO : LiNbO₃ crystal. The bandwidths of angle, temperature and wavelength in this configuration are measured to be about 0.51°, 4.1°C and 6 nm, respectively. The large acceptance of non-collinear phase-matching second harmonic generated on the surface shows attractive potential in the application of wavelength conversion.

Third-order nonlinear phenomenon generated on the inner surface of bulk lithium niobate crystals with magnesium doping

“…Spots 4 and 5 are symmetrical with points 1 and 2 about point 0, respectively. The specific phase-matching mechanisms about spots 0, 1, and 3 are explained in our previous article on interface second harmonic phenomenon [11,12] . Our present research focuses on the generation mechanism of the yellow spot marked 2 in Fig.…”

“…Due to the perfectly phase-matching mechanism, the conversion efficiency of the second harmonic generated on the inner surface of the crystal is relatively high [10][11][12] . The efficiency of nonlinear Cherenkov doubling frequency and sum frequency conversion generated on the crystal surface have also been enhanced [11][12][13][14][15][16][17][18][19][20][21] . Although second-order nonlinear processes on surfaces and interfaces have been extensively studied, thirdorder nonlinear processes are rarely studied.…”

Sum-frequency nonlinear Cherenkov radiation generated on the boundary of bulk medium crystal

“…For example, the crystal boundaries is such discontinuity interface from 1 to 0. In our previous research on the boundary of nonlinear crystal we can observe the enhanced NCR which is generated by the sum-frequency polarization wave stimulated by the incident light and the reflected light [13,14]. Furthermore, Roppo et al have also studied on the origin of this effect [15].…”

Multiple shape light sources generated in LiNbO3nonlinear photonic crystals with Sierpinski fractal superlattices

“…Nonlinear photonic crystal (NPC) is a kind of processed ferroelectric crystal, in which partial domains are reversed by applying high voltage electric field. Over the past few decades, much attention has been focused on several aspects of NPCs; for example, the type of ferroelectric crystals, the structure of domain distribution and their optical properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Traditionally, researchers select LiTaO 3 (LT), LiNbO 3 (LN), KTP or strontium barium niobate (SBN), etc, as the crystal raw materials.…”

“…Moreover, a second-harmonic vortex beam generated from a Gaussian pump beam was demonstrated in twisted nonlinear photonic crystals, and a new configuration for engineering various orbital angular momentum (OAM) was studied [13]. Recently, several bandwidths of non-collinear phase-matching second harmonic generation (SHG), with angle, temperature and wavelength about 0.51°, 4.1 °C and 6 nm, respectively, were generated by sum-frequency of the incident and reflected wave on the inner surface of a MgO:LiNbO 3 crystal [15]. A highly integrated two-dimensional aperiodic LN NPC was built to demonstrate a compact, high-peak-power intracavity sum-frequency generator (ISFG) radiating at orange 593.5 nm [16].…”