A REVIEW OF BBO CRYSTAL

Occasionally, the mismatch is often small. As an example, each time a β-BBO crystal is used to frequency double 1550 nm gentle and provide 775 nm light, the group velocity mismatch is only a few femtoseconds for each millimeter.The problem that arises when employing ultrashort pulses for second harmonic generation (SHG) is always that shorter pu