A novel type of quasi-phasematching for the second harmonic generation

18th International Conference PhysicA.SPb

Sokolovskaya, E.G.^1,2 ; Fedorova, K.A.^3 ; Dudelev, V.V.^1,4 ; Rafailov, E.U.^3 ; Sokolovskii, G.S.^1

Ioffe Institute, St-Petersburg, Russia^1

Peter the Great Polytechnic University, St-Petersburg, Russia^2

Aston University, Birmingham, United Kingdom^3

ITMO University, St-Petersburg, Russia^4

关键词: Periodical poling;    Periodically poled nonlinear crystals;    Quasi-phase-matching;    Wave vector;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/769/1/012050/pdf
DOI  :  10.1088/1742-6596/769/1/012050

来源: IOP

【 摘 要 】

We propose a novel type of quasi-phasematching for the second harmonic generation in periodically-poled nonlinear crystals. In contrast to the conventional quasiphasematching where one (or few) quasi-wavevector(s) of periodical poling compensate for the momentum mismatch between a pair of the fundamental photons and the SHG one, with the proposed mechanism the momentum mismatch between several pairs of fundamental and SHG photons is compensated with one quasi-wavevector of periodical poling.