Driven bright solitons on a mid-infrared laser chip

• 成果类型: Article
• 署名作者: Kazakov, Dmitry; Letsou, Theodore P.; Piccardo, Marco; Columbo, Lorenzo L.; Brambilla, Massimo; Prati, Franco; Dal Cin, Sandro; Beiser, Maximilian; Opacak, Nikola; Ratra, Pawan; Pushkarsky, Michael; Caffey, David; Day, Timothy; Lugiato, Luigi A.; Schwarz, Benedikt; Capasso, Federico
• 署名单位: Harvard University; Massachusetts Institute of Technology (MIT); Universidade de Lisboa; Polytechnic University of Turin; Politecnico di Bari; University of Insubria; Technische Universitat Wien; Imperial College London; Interuniversity Microelectronics Centre
• 刊物名称: Nature
• ISSN/ISSBN: 0028-3513
• DOI: 10.1038/s41586-025-08853-y
• 发表日期: 2025-05-01
• 关键词: quantum cascade lasers; frequency combs; integration; generation; transmission; linewidth

摘要

Despite the continuing progress in integrated optical frequency comb technology1, compact sources of short, bright pulses in the mid-infrared wavelength range from 3 to 12 mu m so far remain beyond reach. The state-of-the-art ultrafast pulse emitters in the mid-infrared are complex, bulky and inefficient systems based on the downconversion of near-infrared or visible pulsed laser sources. Here we show a purely DC-driven semiconductor laser chip that generates 1-ps solitons at the centre wavelength of 8.3 mu m at GHz repetition rates. The soliton generation scheme is akin to that of passive nonlinear Kerr resonators2. It relies on a fast bistability in active nonlinear laser resonators, unlike traditional passive mode-locking, which relies on saturable absorbers3, or active mode-locking by gain modulation in semiconductor lasers4. Monolithic integration of all components-drive laser, active ring resonator, coupler and pump filter-enables turnkey generation of bright solitons that remain robust for hours of continuous operation without active stabilization. Such devices can be readily produced at industrial laser foundries using standard fabrication protocols. Our work unifies the physics of active and passive microresonator frequency combs while simultaneously establishing a technology for nonlinear integrated photonics in the mid-infrared5.