{
  "annotation_id": "43862894-0829-4369-9e86-7a5bc8555606",
  "date_created": "2026-03-02T18:01:07.408000Z",
  "date_modified": "2026-03-02T18:01:07.408000Z",
  "file_hash": "33d81719c3357e350770c4911a445d4465e6913ecc2aeb61fe5054d00b95b448",
  "private": false,
  "record": {
    "abstract": "We present the first observation, to our knowledge, of lasing from a\nlevitated, dye droplet. The levitated droplets are created by computer\ncontrolled pico-liter dispensing into one of the nodes of a standing ultrasonic\nwave (100 kHz), where the droplet is trapped. The free hanging droplet forms a\nhigh quality optical resonator. Our 750 nL lasing droplets consist of Rhodamine\n6G dissolved in ethylene glycol, at a concentration of 0.02 M. The droplets are\noptically pumped at 532 nm light from a pulsed, frequency doubled Nd:YAG laser,\nand the dye laser emission is analyzed by a fixed grating spectrometer. With\nthis setup we have achieved reproducible lasing spectra in the visible\nwavelength range from 610 nm to 650 nm. The levitated droplet technique has\npreviously successfully been applied for a variety of bio-analytical\napplications at single cell level. In combination with the lasing droplets, the\ncapability of this high precision setup has potential applications within\nhighly sensitive intra-cavity absorbance detection.",
    "arxiv_id": "physics/0605157",
    "authors": [
      "H. Azzouz",
      "L. Alkhafadiji",
      "S. Balslev",
      "J. Johansson",
      "N. A. Mortensen",
      "S. Nilsson",
      "A. Kristensen"
    ],
    "categories": [
      "physics.optics"
    ],
    "doi": "10.1364/OE.14.004374",
    "journal_ref": "Opt. Express 14, 4374 (2006)",
    "title": "Levitated droplet dye laser",
    "url": "https://arxiv.org/abs/physics/0605157"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "70735676-3477-4ed7-99ae-83b62ddcedb4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}