Continuous-wave backward frequency doubling in periodically poled lithium niobate

TL;DR

This paper demonstrates continuous-wave backward second-harmonic generation in periodically poled lithium niobate using a tunable laser, analyzing resonances and temperature tuning to understand the nonlinear process.

Contribution

First demonstration of backward frequency doubling in bulk periodically poled lithium niobate with detailed resonance and temperature tuning analysis.

Findings

Resonant quasi-phase-matching orders identified

Temperature tuning effectively resolves resonances

Sample properties extracted from theoretical interpolation

Abstract

We report on backward second-harmonic-generation in bulk periodically poled congruent lithium niobate with a 3.2 microns period. A tunable continuous-wave Ti:sapphire laser allowed us exciting two resonant quasi-phase-matching orders in the backward configuration. The resonances were also resolved by temperature tuning and interpolated with standard theory to extract relevant information on the sample.