Orbital angular momentum of photons in noncollinear parametric downconversion

Gabriel Molina-Terriza*, Juan P. Torres, Lluis Torner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalOptics Communications
Issue number1-3
Publication statusPublished - 1 Dec 2003
Externally publishedYes


  • Orbital angular momentum
  • Spontaneous parametric downconversion


Dive into the research topics of 'Orbital angular momentum of photons in noncollinear parametric downconversion'. Together they form a unique fingerprint.

Cite this