TY - JOUR

T1 - Soliton based χ(2) combs in high-Q optical microresonators

AU - Smirnov, S.

AU - Andryushkov, V.

AU - Podivilov, E.

AU - Sturman, B.

AU - Breunig, I.

N1 - Publisher Copyright: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

PY - 2021/8/16

Y1 - 2021/8/16

N2 - Investigations of the frequency combs in χ(3) microresonators have passed a critical point when the soliton based regimes are well established and realized on different platforms. For χ(2) microresonators, where the first harmonic (FH) and second harmonic (SH) envelopes are coupled via the SH generation and optical parametric oscillation, the comb-soliton studies are just starting. Here we report on a vast accessible dual χ(2) soliton-comb family in high-Q microresonators with the SH and FH combs centered at the pump frequency ωp and its half ωp/2. Vicinity of the point of equal FH and SH group velocities λc, available via proper radial poling, is found to be the most advantageous for the generation of spectrally broad dual FH-SH combs. Our predictions as applied to lithium niobate resonators include the dependence of comb and dissipative soliton parameters on the pump power, the deviation λp − λc, the modal quality factors and frequency detunings, and the necessary parameters of radial poling of the resonator. These predictions form a solid basis for the realization of χ(2) frequency combs.

AB - Investigations of the frequency combs in χ(3) microresonators have passed a critical point when the soliton based regimes are well established and realized on different platforms. For χ(2) microresonators, where the first harmonic (FH) and second harmonic (SH) envelopes are coupled via the SH generation and optical parametric oscillation, the comb-soliton studies are just starting. Here we report on a vast accessible dual χ(2) soliton-comb family in high-Q microresonators with the SH and FH combs centered at the pump frequency ωp and its half ωp/2. Vicinity of the point of equal FH and SH group velocities λc, available via proper radial poling, is found to be the most advantageous for the generation of spectrally broad dual FH-SH combs. Our predictions as applied to lithium niobate resonators include the dependence of comb and dissipative soliton parameters on the pump power, the deviation λp − λc, the modal quality factors and frequency detunings, and the necessary parameters of radial poling of the resonator. These predictions form a solid basis for the realization of χ(2) frequency combs.

UR - http://www.scopus.com/inward/record.url?scp=85112257154&partnerID=8YFLogxK

U2 - 10.1364/OE.432529

DO - 10.1364/OE.432529

M3 - Article

C2 - 34615159

AN - SCOPUS:85112257154

VL - 29

SP - 27434

EP - 27449

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 17

ER -