Single Mode Supersymmetric Laser Array

Parity anomaly laser

“…A few recent studies proposed high power single mode lasing based on these anomalous zero modes: Schomerus and Halpern analyzed a parity symmetrybreaking pump in a strained honeycomb lattice [3]: the parity-breaking zero mode overlaps most strongly with the pump, resulting in a lower lasing threshold compared to the other parity-preserving modes. Hokmabadi et al exploited mode pairing via SUSY [4][5][6][7][8], weakly coupling two SUSY partner lattices together and pumping one of them to achieve lasing in the zero mode. Finally, lasing in 1D arrays with topologically protected midgap states has been observed in a few recent experiments [9][10][11][12][13][14][15], where again pumping one of the subsystems (sublattices in this case) induces single mode lasing robust against coupling disorder.…”

“…Previously, Refs. [5,7] suppressed multimode lasing by coupling the two subsystems H A,B together with strength κ and pumping only H A , so that all excited states have weaker gain due to their hybridization with H B . But this is only effective for weak coupling κ ω 1 − ω 0 , where ω 1 is the first excited state's energy, since H no longer commutes with the supercharge q.…”

“…An interesting future direction would be to generalize this scheme to genuinely two-dimensional arrays [35][36][37]. Experimentally, these ideas can be readily tested using coupled ring resonator lattices with optical gain provided by embedded quantum wells, where a conventional SUSY laser was recently demonstrated [7]. This mechanism for achieving stable phase locking of small laser arrays may be useful for increasing the power output of semiconductor lasers, which is particularly important when material constraints such as the optical damage threshold limit the output power from individual lasers.…”