Hybrid integrated ultra-low linewidth coil stabilized isolator-free widely tunable external cavity laser
arXiv:2501.15010 · doi:10.1038/s41467-025-61122-4
Abstract
Precision applications including quantum computing and sensing, mmWave/RF generation, and metrology, demand widely tunable, ultra-low phase noise lasers. Today, these experiments employ table-scale systems with bulk-optics and isolators to achieve requisite noise, stability, and tunability. Photonic integration will enable scalable, reliable and portable solutions. Here we report a hybrid-integrated external cavity widely tunable laser stabilized to a 10-meter-long integrated coil-resonator, achieving record-low 3 - 7 Hz fundamental linewidth across a 60 nm tuning range and 27 - 60 Hz integral linewidth with 1.8E-13 Allan deviation at 6.4 ms across 40 nm, delivering orders of magnitude frequency noise and integral linewidth reduction over state of the art. Stabilization is achieved without an optical isolator, leveraging resilience to optical feedback of 30 dB beyond that of commercial DFB lasers. The laser and reference cavity are fabricated in the same Si3N4 CMOS-compatible process, unlocking a path towards fully integrated visible to ShortWave-IR frequency stabilized lasers.
References in corpus (17)
- Quantum Computing
- Logical quantum processor based on reconfigurable atom arrays
- Demonstration of multi-qubit entanglement and algorithms on a programmable neutral atom quantum computer
- Quantum State Engineering and Precision Metrology using State-Insensitive Light Traps
- High-performance lasers for fully integrated silicon nitride photonics
- High-speed programmable photonic circuits in a cryogenically compatible, visible-NIR 200 mm CMOS architecture
- Thermo-refractive noise in silicon nitride microresonators
- Visible light photonic integrated Brillouin laser
- 36 Hz integral linewidth laser based on a photonic integrated 4.0-meter coil resonator
- Photonic integrated beam delivery in a rubidium 3D magneto-optical trap
- Silicon nitride stress-optic microresonator modulator for optical control applications
- Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser
- Hertz-linewidth and frequency-agile photonic integrated extended-DBR lasers
- Chip-Scale, Sub-Hz Fundamental Sub-kHz Integral Linewidth 780 nm Laser through Self-Injection-Locking a Fabry-Pérot laser to an Ultra-High Q Integrated Resonator
- Modulation-free Laser Stabilization Technique Using Integrated Cavity-Coupled Mach-Zehnder Interferometer
- High-coherence hybrid-integrated 780 nm source by self-injection-locked second-harmonic generation in a high-Q silicon-nitride resonator
- Unified laser stabilization and isolation on a silicon chip