Publications by Jianqi Hu | EPFL Graph Search

High-Energy Mode-Locked Pulses from a Photonic Integrated Mamyshev Oscillator

Tobias Kippenberg, Jianqi Hu, Xinru Ji, Zheru Qiu, Grigorii Likhachev, Zihan Li

Mode-locked lasers (MLLs), capable of generating ultrashort coherent pulses, have been instrumental for numerous applications, including optical frequency metrology, eye surgery, machining, additive manufacturing, imaging and spectroscopy. However, commerc ...

IEEE2025

Arrayed waveguide gratings in lithium tantalate integrated photonics

Tobias Kippenberg, Jianqi Hu

Arrayed waveguide gratings (AWGs) are widely used photonic components for splitting and combining different wavelengths of light. They play a key role in wavelength-division multiplexing (WDM) systems by enabling efficient routing of multiple data channels ...

Optica Publishing Group2025

Self-organized spatiotemporal quasi-phase-matching in microresonators

Camille Sophie Brès, Jianqi Hu, Anton Stroganov, Ozan Yakar, Ji Zhou, Edgars Nitiss, Marco Clementi

Quasi-phase-matching (QPM) is a widely adopted technique for mitigating stringent momentum conservation in nonlinear optical processes such as second-harmonic generation (SHG). It effectively compensates for the phase velocity mismatch between optical harm ...

Springer Science and Business Media LLC2025

Twisted Talbot Effect: Self-Imaging in Angle and Orbital Angular Momentum

Jianqi Hu

The Talbot effect is a self-imaging phenomenon of periodic waves. In the last decades, the understanding of the self-imaging effect has been diversified to different degrees of freedom of different types of waves, highlighting its very general nature. Esse ...

IEEE2025

Arrayed Waveguide Gratings on Integrated Thin-Film Lithium Tantalate

Tobias Kippenberg, Jianqi Hu

Arrayed Waveguide Gratings (AWGs) are ubiquitous and efficient photonic devices used to split and combine different wavelengths of light. They have been widely used as (de)-multiplexer for wavelength division multiplexed optical communication systems, and ...

IEEE2025

Spatiotemporal Quasi-Phase-Matching in Microresonators

Camille Sophie Brès, Jianqi Hu, Ozan Yakar, Ji Zhou, Edgars Nitiss, Marco Clementi

We show how spatiotemporal quasi-phase-matching emerges from all-optical poling of silicon nitride microresonators. Enabled by the coherent photogalvanic effect, the photoinduced χ(2) grating oscillates in space and time, yielding quasi-phase-matched and D ...

Institute of Electrical and Electronics Engineers Inc.2024

Azimuthal beam shaping in orbital angular momentum basis

Jianqi Hu

Shaping the light beam is always essential for laser technology and its applications. Among the shaping technologies, shaping the laser in its Fourier domain is a widely used and effective method, such as a pulse shaper, or a 4f system with a phase mask or ...

SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS2024

Broadband and turnkey Pockels micro-comb with Monolithic Microwave Resonator

Tobias Kippenberg, Jianqi Hu, Mikhail Churaev, Junyin Zhang

We demonstrate a fully hybrid integrated electrooptic comb generator based on a dispersion engineered thin-film Lithium Tantalate microresonator featuring robust turnkey operation and record-broad >200nm span covering the entire telecommunications S, C, an ...

Institute of Electrical and Electronics Engineers Inc.2024

Ultrabroadband Integrated Triply Resonant Electro-Optic Frequency Comb in Lithium Tantalate

Tobias Kippenberg, Jianqi Hu, Mikhail Churaev, Nikolai Kuznetsov, Zihan Li, Junyin Zhang

We demonstrated an integrated electro-optic frequency comb generator with 450nm span and 29.6GHz spacing, entirely covering optical telecom E-, S-, C-, L-, and U-bands, via monolithic co-integration of microwave and photonics resonators on thin-film lithiu ...

Optica Publishing Group (formerly OSA)2024

Integrated Backward Second-Harmonic Generation through Optically Induced Quasi-Phase-Matching

Camille Sophie Brès, Jianqi Hu, Ozan Yakar, Edgars Nitiss

Quasi-phase-matching for efficient backward second-harmonic generation requires sub-μm poling periods, a nontrivial fabrication feat. For the first time, we report integrated first-order quasiphase-matched backward second-harmonic generation enabled by see ...

2023