A new stable polymorph of Li₂TeMo₃O₁₂with wide mid-infrared transparency and a large Raman response

Abstract

Polymorphism is crucial for unraveling crystallization mechanism, predicting crystal structure and discovering novel materials. A new high-symmetric polymorph of Li2TeMo3O12, α-Li2TeMo3O12, was identified successfully by using a spontaneous crystallization technique,...

Achieving broadband ultraviolet to mid-infrared transparency in germanate-based nonlinear optical crystals Cs3REGe3O9 (RE = Y, Gd)

“…1–4 Amongst these materials, those exhibiting acentric structures have assumed paramount significance in academic research and industrial applications due to their diverse functional attributes, including piezoelectricity, ferroelectricity, pyroelectricity, and nonlinear optical (NLO) properties. 5–10 The extensively employed NLO oxide compounds, such as borates including KBBF (KBe 2 BO 3 F 2 ), 11 β-BBO (β-BaB 2 O 4 ), 12 LBO (LiB 3 O 5 ), 13 CLBO(CsLiB 6 O 10 ) crystals, 14 and phosphates including KDP (KH 2 PO 4 ), 15 KTP (KTiOPO 4 ), 16 RTP (RbTiOPO 4 ), 17 etc ., have notably demonstrated their application in the spectral range, spanning from deep ultraviolet (UV) to near-infrared (IR). However, the relatively elevated phonon energy inherent in these materials imposes a limitation on their capacity to fabricate NLO devices that operate beyond the wavelength threshold of 4.5 μm.…”

LiVTeO5: a mid-infrared nonlinear optical vanadium tellurate crystal exhibiting enhanced second harmonic generation activities and notable birefringence

“…These above observations confirm the presence of [TeO 3 ] and [VO 5 ] groups, which corresponds well to the single crystal structure of LVTO. 23,35,37…”

“…For instance, the NLO tellurate crystal Li 2 ZrTeO 6 , which replaces Nb in LiNbO 3 with Te and Zr, extends the IR transmission cutoff edge to 7.4 μm. 22–26…”

Rational Design of a Niobium Tellurite Crystal Nb2Te3O11 Exhibiting Good Overall Infrared NLO Performance by Structural Genetic Engineering

“…The thickness of the NT crystals was characterized by employing a Bruker SMART APEX III CCD diffractometer. The birefringence value was calculated through the formula: R = Δ n × T = | N e – N o | × T , where R , Δ n , T , N e , and N o , correspond to the optical path difference, birefringence, crystal thickness, ordinary wave birefringence, and extraordinary wave birefringence, respectively. , …”