Top-Seeded Solution Growth and Optical Properties of Deep-UV Birefringent Crystal Ba₂Ca(B₃O₆)₂

Abstract

Single crystals of the birefringent material Ba 2 Ca(B 3 O 6 ) 2 (BCBO) with dimensions up to 40 × 28 × 10 mm 3 were successfully grown by top-seeded solution growth (TSSG) method from B 2 O 3 −NaF flux. It exhibits high transmittance in the range of 190−3000 nm with UV cutoff of 178 nm, which is much shorter than that (189 nm) of the commercial UV birefringent crystal, the high-temperature phase of BaB 2 O 4 (α-BBO). Meanwhile, BCBO crystal has large birefringence (Δn = n o − n e = 0.2524−0.0862) in the wavelength range from 178 to 3000 nm and without phase transition from room temperature to the melting point. A prototype of Glan−Taylor polarizer made from BCBO crystal showed an optical extinction ratio of 10 4 :1, which is comparable to those of commercial birefringence crystals. The experimental results demonstrate that the BCBO crystal can be a new promising birefringent crystal for UV, especially the sub-200 nm deep-UV range.

Crystal formation of Cu-Mn-containing oxides and oxyborates in bismuth-boron fluxes diluted by MoO3 and Na2CO3

“…Flux technique for growth of single crystals (or the molten solution technique) is a widely used technique for obtaining the high-quality samples of sufficient size [1][2][3][4][5][6][7][8]. Depending on the crystal-chemical properties of the compound to be synthesized in frameworks of this technique it is necessary to choose the solvent.…”

“…(a) Thermal dependencies of magnetization of Cu 2 MnBO 5 oxyborate with ludwigite structure obtained at H=1 kOe, H||c, H ┴ c for FC (measurements of the magnetization at cooling at nonzero magnetic field), FH (measurements of the magnetization at heating at nonzero magnetic field, after pre-cooling at nonzero magnetic field) and ZFC (measurements of the magnetization at heating at nonzero magnetic field, after pre-cooling at zero magnetic field) regimes (inset (a): thermal dependencies of magnetizationat H=0 2. kOe, H||c, H ┴ c).…”

Sn2B5O9Cl: A Material with Large Birefringence Enhancement Activated Prepared via Alkaline‐Earth‐Metal Substitution by Tin

“…Of these, the BO 3 unit is considered as an excellent birefringent functional unit. First, borates with parallel‐aligned isolated BO 3 , B 2 O 5 , or B 3 O 6 groups can give large birefringence, such as α‐BBO (0.122 at 546 nm), Na 3 Ba 2 (B 3 O 6 ) 2 F (0.114 at 546 nm), Ba 2 Ca(B 3 O 6 ) 2 (0.125 at 546 nm) and Li 2 Na 2 B 2 O 5 (0.097 at 546 nm) . Therefore, the more highly polymerized coplanar BO 3 groups are expected to have the larger average anisotropic polarizability.…”

Rb3Na(H2C3N3O3)4·3H2O with Large Birefringence

“…5−16 Recently, numerous scientific endeavors have been made to find new birefringent materials with good nonlinear optical (NLO) performance, 17−21 and these studies suggest that the molecular construction by using large π-conjugated anionic groups like (BO 3 ) 3– , (B 3 O 6 ) 3– , (NO 2 ) − , (CO 3 ) 2– , (NO 3 ) − , (HCOO) − , and (C 3 N 3 O 3 ) 3– would be a very efficient way. 22−28 By exploiting these groups, a number of excellent crystals Ca 3 (BO 3 ) 2 , 29 Ba 2 Ca(B 3 O 6 ) 2 , 30 KSrCO 3 F, 31 Ba 2 NO 3 (OH) 3 , 32 K 3 (COOH) 3 [B(OH) 3 ] 2 , 33 Ba 3 (C 3 N 3 O 3 ) 2 , 34 etc. have been designed and synthesized.…”