Fourier beam analysis of photonic crystal coupled triangular VCSEL array

Nusrat Jahan; William North; Nisha Kolagotla; Kent D. Choquette

doi:10.1117/12.2650650

15 March 2023 Fourier beam analysis of photonic crystal coupled triangular VCSEL array

Nusrat Jahan, William North, Nisha Kolagotla, Kent D. Choquette

Proceedings Volume 12439, Vertical-Cavity Surface-Emitting Lasers XXVII; 1243905 (2023) https://doi.org/10.1117/12.2650650
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We show that a photonic crystal triangular VCSEL array can lase in three possible coherent supermodes with three distinctive far-field beam profiles. To determine a dominant supermode at a given level of current injection, we define the peak ratio as the ratio between any sidelobe peak to the central peak of the Fourier transform of the far-field. The peak ratio and the number of sidelobes we show provides a numerical method to determine the dominant supermode in a coherent triangular VCSEL array. Coherent operation is found with approximately equal current injection into each element producing a single spectral resonance and structured far-field profile. We compare experimentally extracted peak ratios for an array nominally emitting at 850nm to those calculated from a complex waveguide modal simulation. This Fourier method based far-field analysis may be useful to determine a useful beam profile for target applications.

Conference Presentation

Citation Download Citation

Nusrat Jahan, William North, Nisha Kolagotla, and Kent D. Choquette "Fourier beam analysis of photonic crystal coupled triangular VCSEL array", Proc. SPIE 12439, Vertical-Cavity Surface-Emitting Lasers XXVII, 1243905 (15 March 2023); https://doi.org/10.1117/12.2650650

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