Crystal Growth and Linear and Nonlinear Optical Properties of KIO₃·Te(OH)₆

Abstract

A single crystal of the nonlinear optical material KIO3·Te­(OH)6 (KTI) with dimensions of 37 × 7 × 5 mm3 was successfully grown at room temperature by slow evaporation. Linear and nonlinear optical measurements were performed on these crystals. Rocking curve measurements indicate that the single crystal is of high quality with a full width at half-maximum (fwhm) of 0.023° (82 arcseconds) from the (010) reflection. Refractive index measurements revealed a birefringence of 0.0545 @ 1064 nm. Through the refractive index measurements and the fitted Sellmeier equations, we determined the Type I and Type II phase-matching wavelength ranges. KTI is Type I (Type II) phase-matchable with a fundamental wavelength range from 674–3266 nm (880–2260 nm). Powder second-harmonic generation (SHG) measurements indicate an SHG intensity of 1.2× KH2PO4 (KDP). SHG coefficients were determined by the Maker fringe method on cut and polished (100) and (010) single crystal wafers. The d 31 = 0.24 pm/V and d 32 = 0.73 pm/V were determined. Laser damage threshold (LDT) measurements were also performed, which indicates that KTI has an LDT of 731 MW/cm2 at 1064 nm with a 6 ns pulse width.

SrTi(IO3)6·2H2O and SrSn(IO3)6: distinct arrangements of lone pair electrons leading to large birefringences

“… 22 The TG curve in the range of 370–1000 °C shows a total mass loss of 80.9%, which corresponds to the decomposition process of three I 2 O 5 molecules. 23 The loss is consistent with the calculated value of 82.0%.…”

“… 22 And there is a mass loss of 90.7% in the range of 227–500 °C, which is consistent with the decomposition process of three I 2 O 5 molecules. 23 The loss is consistent with the calculated value of 88.3%.…”

Crystal Structure and Properties of a UV‐Transparent High‐Pressure Polymorph of Mg3TeO6 with Second Harmonic Generation Response

“…Thus the correct choice of the non‐centrosymmetric space group R 3 and the refinement of HP‐Mg 3 TeO 6 as inversion twin can be confirmed . In the fields of tellurate compounds with Te 6+ cations, the maximum SHG signal of 1.2 × KH 2 PO 4 (KDP) were measured for KIO 3 · Te(OH) 6 and Ni 2.5 Mg 0.5 TeO 6 . A grain size dependence of the SHG signals was not performed.…”

“…Tellurium in the oxidation state +6 has no stereoactive lone‐pairs electrons left. Nevertheless, a variety of non‐centrosymmetric compounds containing Te 6+ oxyanions, like potassium tellurates: (K 8 (Te 6 O 17 (OH) 10 )) · (KOH) 0.5 · (H 2 O) 16 , K 8.5 (H 9 Te 6 O 27 ) · 0.5(H 3 O) · 17(H 2 O), telluric acid‐ammonium dihydrogenphosphate: (Te(OH) 6 )((NH 4 )H 2 PO 4 ) 2 ((NH 4 ) 2 HPO 4 ), potassium iodate telluric acid: KIO 3 · Te(OH) 6 are known. Furthermore, alkali sulfate tellurates: (Na 2 (SO 4 ))(Te(OH) 6 ), CsK(SO 4 )Te(OH) 6 , (Rb 1.12 (NH 4 ) 0.88 (SO 4 ))(Te(OH) 6 ), the alkali selenate tellurate: K 2 (SeO 4 )(Te(OH) 6 ), and the tellurate K 3 Na 2 LiTeO 6 were reported to crystallize acentric.…”

“…Also in the case of transition metal tellurates: Ni 3 TeO 6 , Ni 2 CoTeO 6 , Ni 2.5 M 0.5 TeO 6 ( M = Mg, Mn, Cu), and a huge number of mixed tellurates: Li 2 M TeO 6 ( M = Zr 4+ , Hf 4+ or Ge 4+ ), Li 2– x M O 6 ( M = Zr 4+ , Nb 5+ or Te 6+ ; x ≤ 0.5) 2 ,[20a] A GeTeO 6 ( A = Mn 2+ , Cd 2+ , Pb 2+ , Ba 2+ or Sr 2+ ),[20a], LiMn 2 TeO 6 often with corundum related non‐centrosymmetric structure types are known. Only a few of these compounds like KIO 3 · Te(OH) 6, Ni 3 TeO 6 , Ni 2 CoTeO 6 , Ni 2.5 M 0.5 TeO 6 ( M = Mg, Mn, Cu) and A GeTeO 6 ( A = Mn 2+ , Cd 2+ or Pb 2+ )[20a], were examined for their NLO properties, whereby the maximum SHG signal of 1.2 × KH 2 PO 4 (KDP) was measured for KIO 3 · Te(OH) 6 and Ni 2.5 Mg 0.5 TeO 6 …”