Abstract
Spontaneous parametric upconversion (SPUC) and spontaneous parametric downconversion (SPDC) have been observed in the β-barium borate (BBO) crystal, and their mechanisms are experimentally and theoretically investigated. SPUC, tuned from with a FWHM of about , can be attributed to the sum frequency between the quantum noise and the fundamental laser pulse in the type II phase matching condition . SPDC, tuned from with a FWHM of about , can be attributed to the difference frequency between the quantum noise and the fundamental laser pulse in the type I phase matching condition .
© 2009 Optical Society of America
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