Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster VIII

Q 57.5: Poster

Thursday, March 14, 2024, 17:00–19:00, Aula Foyer

Utilizing coupled mode theory for surrogate modeling with 3D FDTD simulations of GaAs-based surface Bragg grating — •Yasmin Rahimof, Igor Nechepurenko, Sten Wenzel, Reza Mahani, and Andreas Wicht — Ferdinand-Braun-Institut (FBH)

Diode lasers with remarkably narrow linewidths, like Extended Cavity Diode Lasers (ECDLs), are vital components for photonic systems which have various applications in quantum computing, optical atomic clocks and quantum sensors based on atom interferometry. The monolithic ECDL (mECDL) represents an advanced photonic device, integrating electro-optical efficiency and compactness onto a single GaAs chip. This study introduces a surrogate model for the Bragg gratings in mECDL.

Recent mECDL improvements focus on optimizing Bragg gratings to reduce frequency noise. Achieving this goal involves utilizing Finite-Difference Time-Domain (FDTD) simulations to investigate the reflectance spectra. However, conducting these simulations is computationally complex. This complexity presents challenges, particularly in the context of large-scale structure simulations. To overcome this problem, we have employed a more efficient approach by integrating 3D FDTD with 1D coupled mode theory. This "hybrid" method created an accurate surrogate model for predicting Bragg grating's reflectance spectrum, drastically reducing simulation time. In summary, our research introduces a robust surrogate model for mECDL Bragg grating, enabling precise performance predictions instead of implementing time-consuming 3D simulations.

Keywords: mECDL; surface Bragg grating; 3D FDTD simulation; coupled mode theory; surrogate modelling