IN PHYSICS BACKWARD FREQUENCY CONVERTORS BASED ON QUASI-PHASE MATCHED CRYSTALS
Abstract
This paper reports on the use of quasi-phase matched (QPM) crystals to implement forward and backward second harmonic generation (BSHG). Recently, the latter and other types of frequency conversion processes have become the subject of widespread research. This is due to many new phenomena and technological advances in the production of short-lived nonlinear lattices,
in a periodically polarized nonlinear crystal (PPNC) the theory of second harmonic generation (SHG) is developed in the approximation of fixed intensity of CW fundamental radiation.
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