Waveguide Resonator with Integrated Phase Modulator for Second Harmonic Generation

TL;DR

This paper demonstrates a lithium niobate waveguide resonator with an integrated phase modulator that achieves stable second harmonic generation, highlighting its potential for integrated photonic networks.

Contribution

It introduces a waveguide resonator with on-chip phase locking for efficient second harmonic generation in lithium niobate, showing stable operation over minutes.

Findings

Achieved over 80% of initial SH power

Maintained lock for more than 5 minutes

System stability limited by DC drift

Abstract

We report second harmonic generation from a titanium indiffused lithium niobate waveguide resonator device whose cavity length is locked to the fundamental pump laser using an on-chip phase modulator. The device remains locked for more than 5 minutes, producing more than 80\% of the initial second harmonic power. The stability of the system is seen to be limited by DC-drift, a known effect in many lithium niobate systems that include deposited electrodes. The presented device explores the suitability of waveguide resonators in this platform for use in larger integrated networks.