Frequency Doubling and Polarization Coupling Using Birefringence-Phase-Matching and Quasi-Phase-Matching Simultaneously in Single Optical Superlattice

Abstract

We proposed a method to simultaneously implement birefringence-phase-matching (BPM) and quasi-phase-matching (QPM) second harmonic generation (SHG) and polarization coupling including six mismatches of wave vectors, in general case, in an optical superlattice (OSL). And the numerical simulations of SHG and polarization coupling in the OSL are carried out. The results indicate that unlike those of SHG processes with only one second harmonic (SH) reported, when one e-polarized fundamental pump is injected into the OSL, another o-polarized fundamental wave, an o-polarized and an e-polarized SHs can be simultaneously generated. The magnitudes of the o-polarized fundamental wave and SHs can be manipulated by an external dc electric field, which is useful when frequency conversion and signal tuning are required simultaneously.

Optical Triode Based on Electrically Induced Quadratic Cascading in an Optical Superlattice

“…To discuss our principle we first introduce a wave coupling theory describing the united effect of EO, SHG and PDC in a PPLN or/and quasi-periodically poled LN (QPPLN) OSL in Ref. [32,33]. Fig.…”

“…( 1)-( 4) in Ref. [32,33] to find a OSL that satisfies our requirement. As well known, the key to QPM in OSL is to design a structure that provides a set of reciprocal vectors to compensate for the mismatches of wave vectors owing to the dispersion of refractive index.…”

“…( 1)-( 4) in Ref. [32,33], that in general, there exist six mismatches of wave vectors relative to SHG, PDC and EO effects. For our purpose, however, we need only to take account of one compensation for .…”