Hybrid integrated ultra-low linewidth coil stabilized isolator-free widely tunable external cavity laser

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 (6)

• Quantum Computing
• 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
• Thermo-refractive noise in silicon nitride microresonators
• Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser
• Unified laser stabilization and isolation on a silicon chip

Cited by in corpus (2)

• Octave Spanning Visible to SWIR Integrated Coil-Stabilized Brillouin Lasers
• A paradigm for universal quantum information processing with integrated acousto-optic frequency beamsplitters