A non-linear optical material of choice for high power lasers with the following main features: High bulk damage threshold Small walk-off angle Possibility of a non-critically phase-matched SHG crystals High transparency in the UV, making it the best option for THG 355nm or THG 343nm SFM possibility for FHG 266nmIs an excellent and yet affordable non-linear crystal offers a range of unique features: High non-linearity Small walk-off angle in the XY plane with NCPM OPO for a 1.57µm signal. Large temperature acceptance.