论文标题
增益转换的半导体激光驱动的孤子微晶
Gain-switched semiconductor laser driven soliton microcombs
论文作者
论文摘要
耗散性的Kerr孤子（DKSS）是通过将芯片刻度微孔子锁定到连续波（CW）III-V激光器的注射锁定而产生的。这一进步启用了以交钥匙模式运行并可以访问微波重复率的完全集成的混合微型梳系统。然而，CW驱动的DKS表现出低的能量转换效率和高光功率阈值，尤其是当重复速率在微波范围内时，可以方便地使用现成的电子设备直接检测。有效的DK可以通过时空结构的光（即脉冲泵送）产生，但是迄今为止，该光线需要复杂的级联调节剂才能进行脉冲合成。在这里，我们演示了脉冲泵送的光子整合方法。 By actively switching the bias current of injection-locked III-V semiconductor lasers with switching frequencies in the X-band and K-band microwave ranges, we pump a crystalline and integrated microresonators with coherent picosecond laser pulses, achieving DKS generation with stable repetition rates and lowering the required average pumping power by one order of magnitude to a record-setting level of a few毫米。此外，我们通过在增益转换模式下访问多模激光态度或应用外部chi支持可靠的单溶质产生来揭示泵脉冲脉冲的相位轮廓的关键作用，并首次在脉冲抽水方案上实施相位工程。我们的工作利用了增益开关技术和脉冲抽水技术的优势，并确定了结合不同紧凑型频率平台的优点，从而增强了节能芯片级微型群的潜力。
Dissipative Kerr solitons (DKSs) have been generated via injection locking of chipscale microresonators to continuous-wave (CW) III-V lasers. This advance has enabled fully integrated hybrid microcomb systems that operate in turnkey mode and can access microwave repetition rates. Yet, CW-driven DKS exhibits low energy conversion efficiency and high optical power threshold, especially when the repetition rate is within the microwave range that is convenient for direct detection with off-the-shelf electronics. Efficient DKS can be generated by spatiotemporally structured light (i.e., pulsed pumping), which to date however has required complex cascaded modulators for pulse synthesis. Here we demonstrate a photonic integrated approach to pulsed pumping. By actively switching the bias current of injection-locked III-V semiconductor lasers with switching frequencies in the X-band and K-band microwave ranges, we pump a crystalline and integrated microresonators with coherent picosecond laser pulses, achieving DKS generation with stable repetition rates and lowering the required average pumping power by one order of magnitude to a record-setting level of a few milliwatts. In addition, we unveil the critical role of the phase profile of the pumping pulses, and for the first time implement phase engineering on the pulsed pumping scheme by either accessing a multimode lasing regime in the gain-switching mode or applying external chirping to support robust single-soliton generation. Our work leverages the advantages of gain switching technique and pulse pumping technique, and establishes the merits of combining distinct compact frequency comb platforms that enhance the potential of energy-efficient chipscale microcombs.
