Two-colour balanced optical cross-correlator using fibre-coupled PPLN waveguides
Abstract
We present a two-colour fully fibre-coupled balanced optical cross-correlator (BOXC) based on sum-frequency generation (SFG) between 1560 nm and 800 nm laser pulses using waveguides implemented in type-0 phase-matched periodically poled LiNbO (PPLN) crystals. The interaction has an effective nonlinear coefficient of = 16.1 pm/V, many times higher than comparable nonlinear crystals used for this SFG interaction such as barium borate (BBO). The resulting sensitivity of the cross-correlator is measured to be 5.11 mV/fs, five times greater than current bulk-optic BOXCs after accounting for differences in transimpedance gain and photodetector responsivity, with the potential for significantly higher sensitivity after optimisations to the cross-correlator design.
Keywords
Cite
@article{arxiv.2506.01812,
title = {Two-colour balanced optical cross-correlator using fibre-coupled PPLN waveguides},
author = {Jonathan Christie and James R. Henderson and Edward W. Snedden and Laura Corner},
journal= {arXiv preprint arXiv:2506.01812},
year = {2025}
}
Comments
To be published in Optics Continuum. 15 pages, 9 figures, 1 table