TY - JOUR

T1 - Effects of dispersion and pumping scheme on soliton-comb regimes in χ (2) microresonators

AU - Smirnov, S.

AU - Podivilov, E.

AU - Sturman, B.

N1 - Russian Foundation for Basic Research (20-02-00511).

PY - 2023/3

Y1 - 2023/3

N2 - Monochromatic pumping of χ ( 2 ) microresonators is promising for frequency comb generation. Two main generation schemes refer to pumping into the phase-matched first harmonic (FH) and second harmonic (SH)—FH and SH pumping. The phase matching can be natural or artificial (employing periodic poling). Also, minimization of the FH and SH group velocity difference (temporal walk-off) is needed for effective comb generation. So far, perspective soliton-comb regimes were predicted for SH pumping in lithium niobate (LN)-based resonators at a special poling. Here we explore, analytically and numerically, the possibilities for realizing the χ ( 2 ) comb generation for the remaining options of pumping as applied to LN microresonators. This includes the FH pumping case for the pump wavelength λ p ≃ 2698 n m in radially poled resonators and also FH and SH pumping schemes at natural phase matching, λ p ≃ 1664 and 832 nm. It is found that the nonlinear regimes are substantially different and less efficient here as compared to the primary SH pumping case. This is caused by a profound difference between the FH and SH excitation schemes and also by different combinations of signs of the dispersion coefficients for FH and SH resonator modes.

AB - Monochromatic pumping of χ ( 2 ) microresonators is promising for frequency comb generation. Two main generation schemes refer to pumping into the phase-matched first harmonic (FH) and second harmonic (SH)—FH and SH pumping. The phase matching can be natural or artificial (employing periodic poling). Also, minimization of the FH and SH group velocity difference (temporal walk-off) is needed for effective comb generation. So far, perspective soliton-comb regimes were predicted for SH pumping in lithium niobate (LN)-based resonators at a special poling. Here we explore, analytically and numerically, the possibilities for realizing the χ ( 2 ) comb generation for the remaining options of pumping as applied to LN microresonators. This includes the FH pumping case for the pump wavelength λ p ≃ 2698 n m in radially poled resonators and also FH and SH pumping schemes at natural phase matching, λ p ≃ 1664 and 832 nm. It is found that the nonlinear regimes are substantially different and less efficient here as compared to the primary SH pumping case. This is caused by a profound difference between the FH and SH excitation schemes and also by different combinations of signs of the dispersion coefficients for FH and SH resonator modes.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85152128684&origin=inward&txGid=e2da1be237fcc559989ed8976b612156

UR - https://www.mendeley.com/catalogue/7cb05d38-a1cb-3ecb-9904-faf7d3e2106b/

U2 - 10.1364/josab.481257

DO - 10.1364/josab.481257

M3 - Article

VL - 40

SP - 516

EP - 522

JO - Journal of the Optical Society of America B: Optical Physics

JF - Journal of the Optical Society of America B: Optical Physics

SN - 0740-3224

IS - 3

ER -