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arXiv 2604.03474physics.optics
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耗散二次孤子模式锁光参量振荡器

Dissipative quadratic soliton mode-locked optical parametric oscillator

University of Colorado Boulder(科罗拉多大学博尔德分校);University of Electronic Science and Technology of China(电子科技大学)

Jonathan Musgrave, Mingming Nie, Shu-Wei Huang

AI总结:

本文提出通过被动模式锁连续波驱动的双共振退化OPO,利用自发形成的飞秒耗散二次孤子实现超快激光器的扩展,展示了非局部有效克里格非线性对腔体动态的影响,为耗散孤子形成提供了新方法。

摘要:

飞秒模式锁激光器是超快科学的基础,但其谱范围受限于可用增益介质的有限发射带宽。光参量振荡器(OPOs)克服了这一限制,但通常需要外部飞秒激光的同步泵浦。本文展示了一种根本不同的方法:通过自发形成飞秒耗散二次孤子(DQS)实现连续波驱动的双共振退化OPO的被动模式锁。我们表明,通过双共振腔中可忽略的泵浦-信号走离,相匹配的腔内级联二次非线性(PICQN)生成了非局部有效克里格非线性(EKN),该非线性控制腔体动态并驱动孤子形成。工程化的EKN比材料固有克里格非线性大三个数量级,并通过泵浦相位调制连续可调,实现了从色散到非线性工程的范式转变。全面的稳定性分析揭示了由泵浦和腔体条件支配的不同动态区域,为探索此前未充分研究的二次孤子物理提供了灵活框架。实验上,我们观察到1572nm和786nm的双色飞秒DQSs,脉冲持续时间分别为336fs和447fs,峰值功率高达150W,600mW连续波泵浦下的转换效率为5%。本文的工作建立了一种简单、灵活且可扩展的飞秒OPO架构,无需同步模式锁泵浦激光器。通过从传统色散工程转向现场非线性工程,该平台扩展了基于孤子的技术范围,并在不同平台和光谱范围内实现了耗散孤子。

英文摘要:

Femtosecond mode-locked lasers are foundational to ultrafast science, yet their spectral reach remains constrained by the finite emission bandwidth of available gain media. Optical parametric oscillators (OPOs) overcome this constraint but typically require complex synchronous pumping by external femtosecond lasers. Here we demonstrate a fundamentally different approach: passive mode-locking of a continuous-wave-driven, doubly resonant degenerate OPO via the spontaneous formation of femtosecond dissipative quadratic solitons (DQS). We show that phase-matched intracavity cascaded quadratic nonlinearity (PICQN), enabled by negligible pump-signal walk-off in a doubly resonant cavity, generates a non-local effective Kerr nonlinearity (EKN) that governs the cavity dynamics and drives soliton formation. The engineered EKN exceeds the intrinsic material Kerr nonlinearity by more than three orders of magnitude and is continuously tunable in magnitude and sign via pump phase detuning, enabling a paradigm shift from dispersion to nonlinearity engineering for dissipative soliton formation. Comprehensive stability analysis reveals distinct dynamical regimes governed by pumping and cavity conditions, providing a versatile framework for exploring previously understudied quadratic soliton physics. Experimentally, we observe bichromatic femtosecond DQSs at 1572 nm and 786 nm with pulse durations of 336 fs and 447 fs, respectively, peak powers up to 150 W, and a conversion efficiency of 5% under 600 mW continuous-wave pumping. Our work establishes a simple, flexible, and scalable architecture for femtosecond OPOs that bypasses the need for synchronized mode-locked pump lasers. By shifting from traditional dispersion engineering to in-situ nonlinearity engineering, this platform extends the reach of soliton-based technologies and enables dissipative solitons across diverse platforms and spectral regimes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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