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example, to stabilize the offset frequency of the Kerr frequency comb one can directly apply feedback to the pump laser frequency. In principle it is also possible to generate a Kerr frequency comb around a particular continuous wave laser in order to use the bandwidth of the frequency comb to determine the exact frequency of the continuous wave laser.
74:, is the large mode spacing of typical Kerr frequency combs. For mode-locked lasers this mode spacing, which defines the distance in between adjacent teeth of the frequency comb, is typically in the range of 10 MHz to 1 GHz. For Kerr frequency combs the typical range is from around 10 GHz to 1 THz.
51:
where the dominating gain stems from a conventional laser gain medium, which is pumped incoherently. Because Kerr frequency combs only rely on the nonlinear properties of the medium inside the microresonator and do not require a broadband laser gain medium, broad Kerr frequency combs can in principle
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can form. The most relevant type of solitons for Kerr frequency comb generation are bright dissipative cavity solitons, which are sometimes also called dissipative Kerr solitons (DKS). These bright solitons have helped to significantly advance the field of Kerr frequency combs as they provide a way
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The coherent generation of an optical frequency comb from a continuous wave pump laser is not a unique property of Kerr frequency combs. Optical frequency combs generated with cascaded optical modulators also possess this property. For certain application this property can be advantageous. For
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Since their first demonstration in silica micro-toroid resonators, Kerr frequency combs have been demonstrated in a variety of microresonator platforms which notably also include crystalline microresonators and integrated photonics platforms such as waveguide resonators made from
495:
Griffith, Austin G.; Lau, Ryan K. W.; Cardenas, Jaime; Okawachi, Yoshitomo; Mohanty, Aseema; Fain, Romy; Lee, Yoon Ho Daniel; Yu, Mengjie; Phare, Christopher T. (2015-02-24). "Silicon-chip mid-infrared frequency comb generation".
67:. These two features combined result in a large field enhancement of the pump laser inside the microresonator which allow the generation of broad Kerr frequency combs for reasonable powers of the pump laser.
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While the principle of Kerr frequency combs is applicable to any type of optical resonator, the requirement for Kerr frequency comb generation is a pump laser field intensity above the
234:
A. A. Savchenkov; A. B. Matsko; V. S. Ilchenko; I. Solomatine; D. Seidel; L. Maleki (2008). "Tunable
Optical Frequency Comb with a Crystalline Whispering Gallery Mode Resonator".
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J. S. Levy; A. Gondarenko; M. A. Foster; A. C. Turner-Foster; A. L. Gaeta; M. Lipson (2010). "CMOS-compatible multiple-wavelength oscillator for on-chip optical interconnects".
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of the nonlinear process. This requirement is easier to fulfill inside a microresonator because of the possible very low losses inside microresonators (and corresponding high
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In its simplest form with only the Kerr nonlinearity and second order dispersion the physics of Kerr frequency combs and dissipative solitons can be described well by the
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laser with the optical nonlinearity as a gain sets Kerr frequency combs apart from today's most common optical frequency combs. These frequency combs are generated by
377:
Jung, Hojoong; Xiong, Chi; Fong, King Y.; Zhang, Xufeng; Tang, Hong X. (2013-08-01). "Optical frequency comb generation from aluminum nitride microring resonator".
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to generate ultra-short pulses which in turn represent a coherent, broadband optical frequency comb, in a more reliable fashion than what was possible before.
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T. Herr; V. Brasch; J. D. Jost; C. Y. Wang; N. M. Kondratiev; M. L. Gorodetsky; T. J. Kippenberg (2014). "Temporal solitons in optical microresonators".
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One important property of Kerr frequency combs, which is a direct consequence of the small dimensions of the microresonators and their resulting large
171:; A. Schliesser; O. Arcizet; T. Wilken; R. Holzwarth; T. J. Kippenberg (2007). "Optical frequency comb generation from a monolithic microresonator".
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Y. He; Q.-F. Yang; J. Ling; R. Luo; H. Liang; M. Li; B. Shen; H. Wang; K. J. Vahala; Q. Lin (2019). "Self-starting bi-chromatic LiNbO
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of the medium also plays a crucial role for these systems. As a result of the interplay of nonlinearity and dispersion,
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Hausmann, B. J. M.; Bulu, I.; Venkataraman, V.; Deotare, P.; LonÄŤar, M. (2014-04-20). "Diamond nonlinear photonics".
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Andrew M. Weiner (2017). "Frequency combs: Cavity solitons come of age".
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X. Yi; Q.-F. Yang; K. Y. Yang; K. J. Vahala (2016).
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125:. Other effects such as the
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25:optical frequency combs
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450:soliton microcomb".
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17:Kerr frequency combs
707:2016OptL...41.3419Y
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