{
  "annotation_id": "a2ac63b4-1741-4a8a-840e-6dbd08077e18",
  "date_created": "2026-03-02T18:02:23.728000Z",
  "date_modified": "2026-03-02T18:02:23.728000Z",
  "file_hash": "539eb225d03279424935859a95a4b6efdae8d28189cb75d2770792eeb444c0d7",
  "private": false,
  "record": {
    "abstract": "We show lasing without population inversion in a closed four-level atomic\nsystem which is no longer incoherently pumped on the transition at which lasing\noccurs. The four-level system can overcome some limits in the typical\nlambda-type and V-type three-level systems, furthermore it is possible to\nachieve lasing even in the absence of the inversion condition for the thermal\nradiation fields or of the inversion of spontaneous decay rate. We find that\nwhen the detuning of probe field is equal to that of coherent coupling field,\nthere is a peak value along with the increase of the detuning. To explain it,\nwe bring forward that there are adiabatic and nonadiabatic stimulated Raman\nprocesses when a three-level atomic system is interacted with two coherent\nfields, so there are two mechanisms influencing the change of probe field. We\nbelieve that it can explain more general lasing without inversion processes\nbecause of quantum interference induced by coherent fields.",
    "arxiv_id": "quant-ph/0512009",
    "authors": [
      "Li-Feng Cai"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Lasing without inversion in a closed four-level system",
    "url": "https://arxiv.org/abs/quant-ph/0512009"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8f3a35b3-653f-4908-9f07-6cebce17517a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}