Paper

{
  "raw_xml": "<entry>\n    <id>http://arxiv.org/abs/2603.12729v1</id>\n    <title>Two-photon dual-comb LiDAR imaging</title>\n    <updated>2026-03-13T07:20:51Z</updated>\n    <link href='https://arxiv.org/abs/2603.12729v1' rel='alternate' type='text/html'/>\n    <link href='https://arxiv.org/pdf/2603.12729v1' rel='related' title='pdf' type='application/pdf'/>\n    <summary>Conventional LiDAR uses time-of-flight data from laser pulses scanned across a scene to provide accurate multi-meter-scale three-dimensional models at cm precision, limited by the tens-of-picoseconds precision of time-tagging electronics. Here, by using two-photon dual-comb ranging, we introduce an analog of LiDAR imaging using the time-of-flight of sub-picosecond laser pulses to render cm-scale point-cloud datasets with $μ$m precision. Using only free-running femtosecond lasers, the technique combines absolute accuracy with near-interferometric precision, is applicable to discontinuous surfaces with poor optical quality, and provides a stand-off range exceeding that of other optical metrologies. We demonstrate imaging of an aluminum test object and assess its accuracy by comparing our results with those from a touch-probe coordinate measurement machine. At a stand-off distance of 40 cm, we obtain ranging accuracies of 9 $μ$m - 38 $μ$m, and precisions averaging to 1.0 $μ$m after 500 ms.</summary>\n    <category scheme='http://arxiv.org/schemas/atom' term='physics.optics'/>\n    <published>2026-03-13T07:20:51Z</published>\n    <arxiv:comment>4 pages</arxiv:comment>\n    <arxiv:primary_category term='physics.optics'/>\n    <author>\n      <name>Alexander J. M. Nelmes</name>\n    </author>\n    <author>\n      <name>Simon Fletcher</name>\n    </author>\n    <author>\n      <name>Andrew Longstaff</name>\n    </author>\n    <author>\n      <name>Jake M. Charsley</name>\n    </author>\n    <author>\n      <name>Hollie Wright</name>\n    </author>\n    <author>\n      <name>Derryck T. Reid</name>\n    </author>\n  </entry>"
}