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Study of the second harmonic generation and optical rectification in a cBN crystal

Cubic boron nitride (cBN) – a kind of an artificial (synthetic) crystal with the band gap of ∼6.3 eV, which has the zinc blende structure and the 4̄3m symmetry, is studied. The optical rectification is obtained and the second harmonic generation (SHG) is observed in the cBN crystal for the first time by using a 1064-nm Q-switched Nd:YAG laser. The green light at 532 nm from the cBN sample can be seen with a naked eye.