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This paper analytically describes fourth-harmonic generation by utilizing the phenomena of total internal reflection quasiphase-matching in a parallel slab geometry of uniaxial crystal made of magnesium oxide doped Lithium Niobate. The effects of optical loss, namely, linear absorption, GH shift, and reflection loss on account of surface roughness, have been considered in this analysis. Finally, the analysis has also taken into account the cataclysmic effect that arises from the nonlinear law of reflection. The effects of variation of related slab parameters, i.e., length, thickness on the fourth harmonic efficiency, have also been studied. When compared to other approaches (e.g., Cascade, periodic polling) utilized for fourthharmonic generation, this scheme greatly increased the conversion efficiency. The maximum conversion efficiency obtained for an operating wavelength of 750 nm is 2.05%.
Fourth harmonic generation, TIR-QPM, Parallel slab, Uniaxial crystal, MgO: LN.
JAYA SAHA, SUMITA DEB, Total internal reflection quasi phase matching based fourth harmonic generation in a parallel uniaxial crystal of magnesium oxide doped Lithium Niobate, Optoelectronics and Advanced Materials - Rapid Communications, 17, 9-10, September-October 2023, pp.430-441 (2023).
Submitted at: Sept. 30, 2022
Accepted at: Oct. 9, 2023