Long-term absolute frequency stabilization of a hybrid-integrated InP-Si3N4 diode laser

Abstract

Hybrid integrated diode lasers based on combining semiconductor optical amplifiers with low-loss Si3N4-based feedback circuits enable great laser performance for advanced photonic circuits. In particular, using high-Q Si3N4 ring resonators for frequency-selective feedback provides wide spectral coverage, mode-hop free tuning, and high frequency stability on short timescales, showing as ultra-narrow intrinsic linewidths. However, many applications also require long-term stability, which can be provided by locking the laser frequency to a suitable reference. We present the stabilization of a hybrid-integrated laser, which is widely tunable around the central wavelength of 1550 nm, to a fiber-based optical frequency discriminator (OFD) and to an acetylene absorption line. By locking the laser to the OFD, the laser's fractional frequency stability is improved down to 2.1$\cdot$10${}^{-12}$ over an averaging time of 0.5 ms. For absolute stability over longer times of several days, we successfully lock the laser frequency to an acetylene absorption line. This limits the frequency deviations of the laser to a range of less than 12 MHz over 5 days.

12 pages, 6 figures

References in corpus (11)

• Hertz-linewidth semiconductor lasers using CMOS-ready ultra-high-$Q$ microresonators
• SpectraPlot.com: Integrated Spectroscopic Modeling of Atomic and Molecular Gases
• Visible light photonic integrated Brillouin laser
• Hybrid integrated semiconductor lasers with silicon nitride feedback circuits
• 36 Hz integral linewidth laser based on a photonic integrated 4.0-meter coil resonator
• Fully on-chip photonic turnkey quantum source for entangled qubit/qudit state generation
• Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser
• A transportable clock laser system with an instability of $1.6\times 10^{-16}$
• Ultraprecise optical-frequency stabilization with heterogeneous III-V/Si lasers
• External Cavity Diode Laser Setup with Two Interference Filters
• Simple and compact diode laser system stabilized to Doppler-broadened iodine-lines at 633 nm

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