Noncritical phase‐matched second‐harmonic generation with an organic crystal, 4‐(isopropylcarbamoyl)nitrobenzene

This letter reports an organic crystal that can generate a second‐harmonic beam under type II noncritical phase‐matching conditions. The cleavage plane of a 4‐(isopropylcarbamoyl)nitrobenzene (PCNB) crystal was found by theoretical calculation to have a type II noncritical phase‐matched incident surface. This enables the PCNB crystal to convert Ti:sapphire laser light (930 nm) into 465 nm blue light with high conversion efficiency (1%/W at 5.5 mm path length).