In a groundbreaking advancement poised to redefine the landscape of ultrafast photonics, researchers have unveiled an integrated mode-locked laser that delivers unprecedented pulse energies previously unattainable on photonic integrated circuits (PICs). This seminal work, introduced by Qiu and colleagues and published in Nature, presents a novel laser architecture harnessing the Mamyshev oscillator concept combined with erbium-ion-implanted silicon nitride waveguides. The result is a compact, chip-scale laser source capable of delivering nanojoule-level pulses at a 176 MHz repetition rate, setting a new milestone in integrated ultrafast laser technology.

Ultrafast lasers represent a linchpin technology in modern science and industry, enabling landmark innovations ranging from precision eye surgery to real-time observation of chemical reactions and the realization of high-precision optical atomic clocks. Yet, despite aggressive research and development over recent decades, the challenge has remained to translate the high performance of conventional fiber-based ultrafast lasers onto photonic chips without sacrificing pulse energy. Typical integrated systems have been hampered by low output pulse energies, limiting their applications particularly in driving nonlinear optical processes, such as supercontinuum generation.

The research team surmounted this formidable challenge by integrating erbium ions into silicon nitride photonic platforms, exploiting the advantageous gain properties of erbium while leveraging the low propagation loss and broad transparency window of silicon nitride. This innovative hybrid integration forms the active medium of the laser, facilitating efficient gain within a highly compact and scalable photonic chip environment. Silicon nitride’s compatibility with CMOS fabrication techniques further paves the way for wafer-scale manufacturing and on-chip integration with other optical components.

Crucially, the laser is constructed around a Mamyshev oscillator configuration, a paradigm that departs from traditional mode-locking schemes. The Mamyshev oscillator utilizes a combination of alternating spectral filtering and nonlinear self-phase modulation to achieve stable mode-locking operation. This architecture excels in enabling large nonlinear phase shifts, which are essential in maintaining pulse integrity and achieving high pulse energies, particularly on integrated platforms. By alternating spectral filtering within the cavity, the system effectively self-regulates, maintaining a consistent output without the need for external seed sources or complex stabilization mechanisms.

Operating at a repetition rate of 176 MHz, the laser generates pulses with nanojoule-scale energy, bringing integrated sources in line with fiber laser systems while outstripping previous chip-scale implementations by approximately two orders of magnitude. The output pulses exhibit exceptional coherence and can be compressed to durations as short as 147 femtoseconds via linear compression techniques, achieving temporal brevity highly sought after in ultrafast science. This represents a major breakthrough, as prior integrated mode-locked lasers have generally struggled to produce both short pulses and sufficient energy simultaneously.

Beyond pulse characterization, the utility of this laser is strikingly demonstrated by its ability to drive a supercontinuum generated directly within silicon nitride waveguides spanning an impressive 1.5 octaves in optical bandwidth. This is particularly significant because supercontinuum generation typically demands high peak powers or additional amplification stages. Here, the compact on-chip laser source alone suffices, eliminating the need for bulky external components and enhancing integration potential for portable spectroscopy and metrology applications.

The tangible impact of this ultrafast source is exemplified in the authors’ demonstration of a miniaturized terahertz time-domain spectrometer, an instrument paramount for broadband electromagnetic wave measurement and chemical sensing. Utilizing the integrated mode-locked laser, the spectrometer achieved a bandwidth of 5 terahertz with an outstanding dynamic range of 90 dB, enabling highly sensitive, non-contact chemical analysis. This application underscores the laser’s promise not just in laboratory settings, but in diverse fields requiring compact and precise spectroscopic tools such as environmental monitoring, security, and medical diagnostics.

Importantly, this work addresses critical limitations in scalability and manufacturability that have hindered the translation of ultrafast laser technology to integrated photonics. The erbium implantation process adopted is compatible with established silicon nitride fabrication workflows, signaling that this breakthrough is not merely a proof of concept but a viable pathway to mass production. The prospects for chip-scale frequency metrology, portable ultrafast spectroscopy, and even integration into complex photonic circuits for advanced information processing are now markedly brighter.

This pioneering laser architecture also invites renewed exploration into nonlinear optical dynamics on chip-scale platforms. The synergy between large nonlinear phase shifts enabled by the Mamyshev mechanism and the enhanced gain provided by erbium ions opens vistas for new integrated nonlinear devices and frequency comb generators with unprecedented performance metrics. The ability to engineer pulse shape, energy, and timing directly on chip will no doubt inspire fresh theoretical and experimental research directions.

From a technological standpoint, the achievement seamlessly aligns with global trends toward miniaturization, energy efficiency, and system integration in photonics. By accomplishing state-of-the-art ultrafast pulse generation within a compact footprint, this research brings us closer to ubiquitous ultrafast laser sources embedded in a wide range of devices. This paradigm shift promises to catalyze innovations across numerous disciplines reliant on light-matter interaction at ultrafast timescales.

As the community digests these findings, future work will likely explore the tailoring of erbium ion distributions, dispersion engineering of silicon nitride waveguides, and enhanced filter designs to push pulse energies and durations even further. Moreover, integrating active phase stabilization and feedback control mechanisms could further improve laser stability and coherence, fully exploiting the Mamyshev oscillator’s potential in practical systems.

This seminal study by Qiu et al. redefines what is achievable in integrated ultrafast photonics, demonstrating that chip-scale mode-locked lasers can now compete with—and even surpass—traditional fiber-based counterparts in pulse energy output and functional versatility. This is a critical step toward fully integrated photonic systems where ultrafast light generation, manipulation, and detection coexist on a single chip, heralding a new era in optical science and technology.

Subject of Research:
Integrated ultrafast mode-locked laser technology based on Mamyshev oscillator architecture incorporating erbium-ion-implanted silicon nitride waveguides.

Article Title:
High-pulse-energy integrated mode-locked laser using a Mamyshev oscillator.

Article References:
Qiu, Z., Yang, X., Li, X. et al. High-pulse-energy integrated mode-locked laser using a Mamyshev oscillator. Nature 654, 57–63 (2026). https://doi.org/10.1038/s41586-026-10517-4

Image Credits:
AI Generated

DOI:
https://doi.org/10.1038/s41586-026-10517-4

Keywords:
Ultrafast lasers, photonic integrated circuits, mode-locking, Mamyshev oscillator, erbium-ion implantation, silicon nitride waveguides, supercontinuum generation, terahertz spectroscopy, integrated photonics, nonlinear optics.