paper

Dissipative Kerr Solitons in a III-V Microresonator

arXiv:2003.06438 · doi:10.1002/lpor.202000022

Abstract

We demonstrate stable microresonator Kerr soliton frequency combs in a III-V platform (AlGaAs on SiO $_{2}$ ) through quenching of thermorefractive effects by cryogenic cooling to temperatures between 4~K and 20~K. This cooling reduces the resonator's thermorefractive coefficient, whose room-temperature value is an order of magnitude larger than that of other microcomb platforms like Si $_{3}$ N $_{4}$ , SiO $_{2}$ , and AlN, by more than two orders of magnitude, and makes soliton states adiabatically accessible. Realizing such phase-stable soliton operation is critical for applications that fully exploit the ultra-high effective nonlinearity and high optical quality factors exhibited by this platform.