780 nm wavelength distributed feedback lasers have been integrated onto a Si3N4 photonic platform on a Si substrate and coupled into waveguides for laser locking to either a ring resonator or rubidium vacuum cell.
A silicon nitride micro-ring resonator with loaded Q factor of 1.4 million at 780 nm wavelength on silicon substrates for chip-scale atomic systems targeting the 87 Rb atomic transition at 780.24 nm.
A silicon nitride micro-ring resonator with a loaded Q factor of 1.4 × 10 6 at 780 nm wavelength is demonstrated on silicon substrates. This is due to the low propagation loss waveguides achieved by optimization of waveguide sidewall interactions and top cladding refractive index. Potential applications include laser frequency stabilization allowing for chipscale atomic systems targeting the 87 Rb atomic transition at 780.24 nm. The temperature dependent wavelength shift of the micro-ring was determined to be 13.1 pm/K indicating that a minimum temperature stability of less than ±15 mK is required for such devices for wavelength locking applications. If a polyurethane acrylate top cladding of an optimized thickness is used then the micro-ring could effectively be athermal, resulting in reduced footprint, power consumption, and cost of potential devices.
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