Abstract: Terbium-based Faraday rotators, optical isolators incorporating the Faraday rotators, and methods for forming the Faraday rotators are described. Formation methods include hydrothermal growth methods for forming monolithic single crystals of TbO(OH) as Faraday rotator materials. TbO(OH) can also be used as a starting material in a hydrothermal growth method to form monolithic single crystals of TbxYb(2-x)O3, in which x is between about 0.05 and about 1 or terbium aluminum garnet TAG for use as a Faraday rotator in an optical isolator.

Abstract: Terbium-based Faraday rotators, optical isolators incorporating the Faraday rotators, and methods for forming the Faraday rotators are described. Formation methods include hydrothermal growth methods for forming monolithic single crystals of TbO(OH) as Faraday rotator materials. TbO(OH) can also be used as a starting material in a hydrothermal growth method to form monolithic single crystals of TbxYb(2-x)O3, in which x is between about 0.05 and about 1 or terbium aluminum garnet TAG for use as a Faraday rotator in an optical isolator.

Abstract: Single, acentric, hexagonal, beryllium borate crystals having the formula Sr2Be2B2O7 with a new structural type with space group of P(-)6 and a unit cell of unit cell a=b=4.6709(7) ?, c=3.8410(7) ? and trigonal borate groups within the unit cell lattice whereby the trigonal groups are fully ordered and directly lined up above each other with no rotation of the stacking groups relative to each other. These crystals can be formed according to a hydrothermal formation process with a size sufficient for use in a variety of laser and nonlinear optical applications.