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Near-octave lithium niobate soliton microcomb
Optica ( IF 10.4 ) Pub Date : 2020-09-28 , DOI: 10.1364/optica.400994
Zheng Gong , Xianwen Liu , Yuntao Xu , Hong X. Tang

Thin film lithium niobate (LN) is bringing renewed potential to the realm of integrated photonics. Its strong quadratic and cubic nonlinearities as well as wide transparency window are ideal for realizing on-chip self-referenced soliton microcombs. However, broadband Kerr cavity soliton generation in LN thin films remains challenging due to limited dispersion control and competition from strong stimulated Raman scattering (SRS). Here, we demonstrate the generation of soliton microcombs in LN thin films featuring broad spectral spans up to 4/5 octaves with the emission of dual dispersion waves (2/3 octaves apart) and sub-terahertz repetition rates (down to 335 GHz) by suppressing strong SRS. Numerical simulations based on coupled-mode equations that incorporate Raman effects further elucidate the soliton dynamics in this highly Raman-active material system.

中文翻译:

近八度铌酸锂孤子微梳

薄膜铌酸锂(LN)正在为集成光子学领域带来新的潜力。其强大的二次和三次非线性以及宽的透明窗口是实现片上自参考孤子微梳的理想选择。然而,由于有限的色散控制和来自强受激拉曼散射(SRS)的竞争,LN薄膜中宽带克尔腔孤子的产生仍然具有挑战性。在这里,我们演示了LN薄膜中孤子微梳的产生,该谱具有高达4/5倍频程的宽光谱范围,并发射了双色散波(相距2/3倍频程)和亚太赫兹重复频率(低至335 GHz)。抑制强SRS。
更新日期:2020-11-15
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