Long-term Frequency Stabilization of a Hybrid-integrated InP-Si3N4 Diode Laser

Abstract

Hybrid integration of diode amplifiers with Si3N4 feedback circuits offers wide tuning and high frequency stability on short timescales. We improve long-term stability, for the first time, by locking the laser frequency to an acetylene absorption line.

Hybrid integrated laser at visible wavelengths using aluminum nitride photonic integrated circuit

“…Both properties are necessary for tightly confining and low loss waveguides that can operate at wavelengths used in atom-cooling and iontrapping experiments, which range from ultra-violet (UV) to infra-red (IR). AlN also has an electro-optical coefficient, optical non-linearities (χ (2) and χ (3) ), and is piezoelectric. These features have been harnessed into many applications, well documented in reviews by N. Li et al 1 and Liu et al 2 A device not featured in these reviews is a fully on-chip light source.…”

“…Hybrid ECDLs are known for similar spectral qualities to bulk ECDLs with the added benefits of a PIC platform. Recent exemplars include publications by Van Rees et al 3 and M. Li et al 4 Both of these publications operate in the telecommunications wavelength range partially due to the material choice. Silicon nitride (SiN x ) and lithium niobate (LiNbO 3 ) are the two popular material platforms for hybrid ECDLs.…”