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One of the key insights in the emerging field of non-Hermitian photonics isthat well-established concepts like the laser can be operated in reverse torealize a 'coherent perfect absorber' (CPA). While conceptually appealing, suchCPAs are limited so far to a single, judiciously shaped wavefront or 'mode'.Here, we demonstrate how this limitation can be overcome by time-reversing a'degenerate cavity laser', based on a unique cavity that self-images anyincident light-field onto itself. Placing a weak, critically-coupled absorberinto this cavity, we demonstrate that any incoming wavefront, even a complexand dynamically-varying speckle pattern, is absorbed with close to perfectefficiency in a massively parallel interference process. Moreover, the coherentnature of multi-mode absorption allows us to tune the degree of absorption overa wide range. These characteristics open-up interesting new possibilities forapplications in light-harvesting, energy delivery, light control, and imaging.

Massively degenerate coherent perfect absorber for arbitrary wavefronts