APP Phase-Matching for the Nonlinear Frequency Conversion (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

APP Phase-Matching for the Nonlinear Frequency Conversion

Caption

(a) Schematic graph of additional-phase-matching condition in arbitrary nonlinear optical crystals. The white and grey regions represent ordered crystal and disordered amorphous, respectively. The period length Λ equals the sum of ordered width La and disordered width Lb (Λ = La + Lb). Notably, La and Lb may be equivalent to coherent length Lc or integral multiple of Lc. deff/0 and n1/n2 represent the second-order nonlinear coefficient and refractive index of ordered and disordered regions, respectively. (b) Schematic estimation of the SH field amplitude of the APP quartz with different shifted phase (ΔφAPP) under the same crystal length. (c) Theoretical calculation of the APP (ΔφAPP) with the APP quartz samples of La=Lb= 2.1 μm, 1.4 μm, and 0.7 μm (d) 177.3 nm SHG output power in APP quartz (purple point) with La=Lb= 2.1 μm and Δφ=3π and in as-grown quartz (green point).

Credit

Mingchuan Shao, Fei Liang, Haohai Yu, Huaijin Zhang

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