{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"3168d85c262a827fd9602ee5f0f96cc4519394f62406af00a8d8aa53cbcb10a0","created":"2026-10-03T07:17:53Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"3c6784870585c24be98d0ebe286f82395495725c77ae642620303016ac36fcf3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"amo.anderson-localization-3d.random-laser-modes","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"A random laser has no mirrors: light bounces among random scatterers in a material with gain until it lases. A theory that predicts how many modes lase, what they look like and how their output fluctuates from shot to shot is still missing.","posed_since":"","precise":"Multimode random laser with saturable gain in a disordered medium of scattering mean free path l, size $L >> l$, from the diffusive regime ($kl >> 1$, $k$ the wavenumber) toward localization. Quantities: number of lasing modes versus pump, their spatial profiles and the shot-to-shot emission statistics (including Levy-type heavy tails). SALT (steady-state ab initio laser theory) solves single disorder realizations; an answer is an ensemble theory that predicts these statistics with no fitted parameters and is checked against an experiment with characterized disorder.","problem_ref":null,"references":"","settled_by":"Comparison of measured mode number, spectra and intensity statistics in a sample of known l and gain with ensemble-averaged first-principles laser simulations.","status_note":"","title":"First-principles statistics of lasing modes in random 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