OptoSigma partnered with an Eastern Europe laser crystal growing company exclusively provided raw material to OptoSigma to polish and fine finish and coatings to provide to customer a best quality and assured supply chain in laser crystals. The crystals can be dopped at your requirement, orientation or size. Customization is flexible. Nd:YAG Crystals. Neodymium Doped Yttrium Aluminum Garnet - Nd:YAG laser. Yb:KGW and Yb:KYW Crystals., Nd:KGW Crystals. Ti:Sapphire Crystals.