Li₂MTeO₆ (M=Ti, Sn): Mid‐Infrared Nonlinear Optical Crystal with Strong Second Harmonic Generation Response and Wide Transparency Range

Abstract

Oxide crystals have been widely used in nonlinear optics (NLO) in the ultraviolet-visible and near-infrared regions.M ost traditional oxide crystals are restricted to the mid-infrared region due to their narrowtransmission window. Hence,a ttempting to extend infrared cutoff wavelength of oxides has attracted muchattention. Herein, we report two new tellurates Li 2 TiTeO 6 (LTT) and Li 2 SnTeO 6 (LST) with broad transparent regions of 0.38-6.72 and 0.38-6.86 mm, respectively,asexcellent candidates for mid-infrared NLO applications. Both LTTa nd LST crystallizei nt he orthorhombic space group Pnn2. The LTTcrystal exhibits intense powder secondorder generation efficiency (26 KDP) under the fundamental wavelength of 1064 nm. First-principles calculations and dipole moments were used to illustrate the results of the powder second-harmonic generations based on the crystal structures. Our results provide an ovel oxide NLO crystal with as trong SHG and wide transparency range.T hey also pave aw ay for the design of new oxide mid-IR NLO crystals.

Centrosymmetric Rb[Te2O4(OH)5] and noncentrosymmetric K2[Te3O8(OH)4]: metal tellurates with corner and edge-sharing (Te4O18)12− anion groups

“…S5a†), and the bond distances in Rb–O are 2.890 Å–3.274 Å, matching with those reported in other compounds. 40 The Te–O bond lengths range from 1.894 Å to 1.933 Å for Te(1) and 1.814 Å–1.983 Å for Te(2), which agreed with the reported tellurates 41 (Fig. S6a and S6b†).…”

KPb3(o-C5H4NCOO)2Cl5: a brand-new stable lead chloride with good comprehensive nonlinear optical performance

“…This research puts forward a feasible idea for the exploration of new NLO crystals.Nonlinear optical (NLO) crystals are of intensive academic and technological interest because they can generate a coherent laser through frequency conversions, like second-harmonic generation (SHG). [1][2][3][4] Actuated by the rapid development of advanced technology, NLO crystals have significant applications in all-solid-lasers, laser guidance, precise micro-manufacturing, biological tissue imaging and advanced scientific instruments. [5][6][7][8][9][10][11] Over the past decades, scientists have made great efforts to explore NLO crystals and elucidate the relationship between their structures and NLO properties.…”

SrZnGeS4: A Dual‐Waveband Nonlinear Optical Material with a Transparency Spanning UV/Vis and Far‐IR Spectral Regions

“…Some examples of such oxides are β‐BaB 2 O 4 (BBO, 0.189–3.5 μm), [3a] KH 2 PO 4 (KDP, 0.176–1.55 μm), [3a] KTiOPO 4 (KTP, 0.35–4.5 μm), [3a] and LiNbO 3 (LN, 0.4–5.5 μm) [3a] . Recently, a transparency window extending to the IR region was found for iodates, selenates, tellurates, silicates, and oxide halides, [4] for instance, Lu 3 F(SeO 3 ) 4 (0.35–10.3 μm) [4a] and Li 2 TiTeO 6 (0.38–6.72 μm), [4b] however, the far‐IR regions remain impenetrable because of the low vibration energy of M−O bonds fall in this region. Therefore, NLO oxides cannot be used for applications in the regions in which they appear opaque, that is, the IR, and particularly the far‐IR region.…”