Photon echo

{
  "id": "MLC-T-CHM-008896",
  "term": "Photon echo",
  "field": "Chemistry",
  "definition": "A transient optical phenomenon where a material, after being excited by two or more short laser pulses, emits a burst of light at a later time. This emission, the photon echo, is a rephasing of the excited states due to inhomogeneous broadening. It is used in ultrafast spectroscopy to study dephasing processes and molecular dynamics.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "chromophore",
    "non-linear optical techniques",
    "optical spectroscopy",
    "polarization",
    "solvation"
  ],
  "references": [
    "PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 394 (https://doi.org/10.1351/pac200779030293)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/photon-echo/"
}