{
  "annotation_id": "ad091e5c-ed48-4c6f-9021-1ef93d25e071",
  "date_created": "2026-03-02T18:01:18.380000Z",
  "date_modified": "2026-03-02T18:01:18.380000Z",
  "file_hash": "d07df6f364dc2c020da152b6a7cdd1aad2b3a28fb17f4dff54d0b648dc0f23e1",
  "private": false,
  "record": {
    "abstract": "We report on a scheme to improve the pointing stability of the first order\nbeam diffracted by an acousto-optic modulator (AOM). Due to thermal effects\ninside the crystal, the angular position of the beam can change by as much as 1\nmrad when the radio-frequency power in the AOM is reduced to decrease the first\norder beam intensity. This is done for example to perform forced evaporative\ncooling in ultracold atom experiments using far-off-resonant optical traps. We\nsolve this problem by driving the AOM with two radio-frequencies $f_1$ and\n$f_2$. The power of $f_2$ is adjusted relative to the power of $f_1$ to keep\nthe total power constant. Using this, the beam displacement is decreased by a\nfactor of twenty. The method is simple to implement in existing experimental\nsetups, without any modification of the optics.",
    "arxiv_id": "physics/0701183",
    "authors": [
      "B. Fr\u00f6hlich",
      "T. Lahaye",
      "B. Kaltenh\u00e4user",
      "H. K\u00fcbler",
      "S. M\u00fcller",
      "T. Koch",
      "M. Fattori",
      "T. Pfau"
    ],
    "categories": [
      "physics.optics",
      "physics.ins-det"
    ],
    "doi": "10.1063/1.2720725",
    "journal_ref": "Rev. Sci. Instrum. 78, 043101 (2007)",
    "title": "A two-frequency acousto-optic modulator driver to improve the beam   pointing stability during intensity ramps",
    "url": "https://arxiv.org/abs/physics/0701183"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c165d41a-1020-472a-a8e4-a8f9442f5d29",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}