{
  "annotation_id": "8cbd50ab-f5ec-457e-883a-918eb6752628",
  "date_created": "2026-03-02T18:00:57.281000Z",
  "date_modified": "2026-03-02T18:00:57.281000Z",
  "file_hash": "b5c466deea698b000afadfcf8cb922c093f7c3e201a095de471df5a7119b5259",
  "private": false,
  "record": {
    "abstract": "By using perturbation theory we derive an expression for the electrical field\nof a Gaussian laser pulse propagating in a gas medium. This expression is used\nas a trial solution in a variational method to get quasianalytical solutions\nfor the width, intensity and self-focusing distance of ultrashort pulse. The\napproximation gives an improved agreement with results of numerical simulations\nfor a broad range of values of the input power of the pulse than previous\nanalytical results available in the literature.",
    "arxiv_id": "physics/0503131",
    "authors": [
      "E. Arevalo",
      "A. Becker"
    ],
    "categories": [
      "physics.optics",
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevE.72.026605",
    "title": "Variational analysis of self-focusing of intense ultrashort pulses in   gases",
    "url": "https://arxiv.org/abs/physics/0503131"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "45d1bd41-0c65-443a-b782-4e52942a612a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}