Temporally Incoherent Twin Beams of Light

Orhan Aytür, Prem Kumar

Research output: Contribution to journalArticlepeer-review


Temporally incoherent twin beams of light are generated by means of an optical parametric amplifier that is pumped by the second harmonic of a Q-switched multi-longitudinal-mode Nd:YAG laser. For a parametric gain of 1·12, the intensity noise levels on the direct-detected signal and idler twin beams are found to be correlated by 1·4 dB, whereas the subtracted noise falls below the quantum limit by 0·7 ± 0·1 dB (15%). Although no direct coherence experiment is performed on the twin beams themselves, their temporal incoherence is manifested by the stringent path-length matching requirement between the pump and input signal beams.
Original languageEnglish
Pages (from-to)815-819
JournalJournal of Modern Optics
StatePublished - May 1991


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