Li₈NaRb₃(SO₄)₆·2H₂O as a new sulfate deep-ultraviolet nonlinear optical material

Abstract

A new sulfate Li8NaRb3(SO4)6·2H2O exhibits a short cutoff edge below λ < 190 nm and has a moderate second-harmonic generation response in type-I phase-matchable behavior.

Sb6O7(SO4)2: A Promising Ultraviolet Nonlinear Optical Material with an Enhanced Second‐Harmonic‐Generation Response Activated by SbIII Lone‐Pair Stereoactivity

“…A major reason may be that sulfates are difficult to synthesize because they are unstable and tend to release the poisonous gas SO 3 at high temperature. Another reason is that sulfates are also not easily achieved through a facile aqueous‐based approach due to the low solubility of most sulfates [31, 32] . Hence, exploring an approach for the generation of sulfates is important.…”

M(NH2SO3)2 (M=Sr, Ba): Two Deep‐Ultraviolet Transparent Sulfamates Exhibiting Strong Second Harmonic Generation Responses and Moderate Birefringence

“…As shown in Figure 4 c and d, both of them are phase‐matchable at 1064 and 532 nm based on the rule proposed by Kurtz and Perry [39] . The SHG responses of SNSO and BNSO are about 1.2 and 2.7 times that of the KDP, and about 0.32 and 0.73 times that of β‐BBO with the particle size of 150–212 μm, respectively, and are larger than most of DUV NLO phosphates and sulfates, such as KLa(PO 3 ) 4 (0.7 × KDP), [36] CsLa(PO 3 ) 4 (0.5 × KDP), [37] (NH 4 ) 2 PO 3 F (0.9 × KDP), [30] [C(NH 2 ) 3 ] 2 PO 3 F (1.0 × KDP), [30] Rb 2 Ba 3 (P 2 O 7 ) 2 (0.3 × KDP), [20] CsSiP 2 O 7 F (0.7 × KDP), [40] K 2 SrP 4 O 12 (0.5 × KDP), [38] (NH4) 2 Na 3 Li 9 (SO 4 ) 7 (0.5 × KDP) [25] and Li 8 NaRb 3 (SO 4 ) 6 ⋅2 H 2 O (0.5 × KDP) [41] . It is worth noting that the SHG response of BNSO is the largest among all of known DUV NLO sulfates and sulfamates, and is even comparable to the DUV NLO crystals containing π‐conjugated groups including M 2 B 10 O 14 F 6 (M=Ca, Sr) (2.3 and 2.5 × KDP), [42] γ‐Be 2 BO 3 F (2.3 × KDP) [43] and CsB 4 O 6 F (1.9 × KDP) [44] …”

A Niobium Oxyiodate Sulfate with a Strong Second‐Harmonic‐Generation Response Built by Rational Multi‐Component Design

“…Despite much research on NCS oxides with SHG responses, including iodates, borates, phosphates, and borate fluorides, no sulfates with utilizable NLO properties have been reported . Most sulfate NLO materials are susceptive to water and contain hydrate, which could become unstable in the heating process, for example, BeSO 4 ⋅4 H 2 O, Li 2 SO 4 ⋅H 2 O, and Li 8 NaRb 3 (SO 4 ) 6 ⋅2 H 2 O . At the same time, these sulfates have weak SHG responses.…”