With existing and emerging technologies urgently demanding the expansion of the laser wavelengths, high-performance nonlinear optical (NLO) crystals are becoming indispensable. Here, a prospective NLO crystal, LiZrTeO, is rationally designed by the element substitution of Nb for Zr and Te from LiNbO, which has been recognized as one of the most commercial NLO crystals. LiZrTeO with R3 symmetry inherits the structural merits of LiNbO (space group R3 c) and thus meets the requirements for NLO applications, including noncentrosymmetric crystal structure, moderate birefringence, and phase-matchability. Moreover, it can be exploited to achieve more outstanding optical damage resistant behavior (>1.3 GW cm), exceeding 22 times that of LiNbO, which is more suitable for high-energy laser applications. Notably, this compound displays the widest IR absorption edge (7.4 μm) among all of the noncentrosymmetric tellurates reported so far. These excellent attributes suggest that LiZrTeO is a promising candidate for providing high NLO performance. The substitution of Nb for Zr and Te from LiNbO demonstrates a viable strategy toward the rational design of NLO crystals with anticipated properties.
Single crystals of the polar material Cs 2 TeW 3 O 12 (CTW) with dimensions up to 26×18×4 mm 3 were successfully grown using a top-seeded solution growth (TSSG) method. The morphologies of the as-grown crystals have been described and compared with that obtained from the Bravais-Friedel and Donnay-Harker (BFDH) methods. The crystal structure of CTW has been solved for the first time using single-crystal X-ray diffraction: the compound crystallizes in polar hexagonal space group P6 3 (no. 173) with cell parameters a = b = 7.3279(3) Å, c = 12.4075(5) Å, Z = 2 10 and V = 577.00(4) Å 3 . Thermal analysis show that CTW is thermally stable up to 820 °C at which it melts incongruently. Further high-resolution X-ray diffraction experiments gave a full-width at half-maximum (FWHM) of the rocking curve of 33″, indicating a good crystalline quality for the as-grown crystals. Optical transmittance spectra of CTW show a broad transmission range from 410 nm to 5310 nm. Powder second-harmonic generation (SHG) measurements with 1064 nm laser indicates that CTW exhibits a strong SHG efficiency of about 1.5 the one of KTiOPO 4 . Polarization 15 measurements indicate that CTW is not ferroelectric, i.e., the polarization is not "switchable". In addition, CTW is nonhygroscopic and resistant to diluted HNO 3 aqua-solution.
Acentric
compounds with a layered structure are of current interest
owing to their advanced functional properties for technical applications.
However, the growth of bulk single crystals of acentric materials
with a quasi-two-dimensional structure is challenging, which severely
hinders the intrinsic properties investigation and optoelectronic
applications of these materials. Herein, we report the controlled
growth of bulk CdTeMoO6 single crystals with a layered
structure and the investigation of their linear and nonlinear optical
properties. High quality CdTeMoO6 single crystals with
dimensions of ∼26 × 10 × 9 mm3 were successfully
grown through the modified top-seeded solution growth method using
TeO2-MoO3 as a flux. The transparent range of
CdTeMoO6 single crystals is in the range of 0.345–5.40
μm, and with large birefringence (Δn = n
o – n
e =
0.2868–0.2219 from 514 nm to 1.5467 μm). In addition, the nonlinear optical (NLO) coefficient d
36 of CdTeMoO6 single crystals was measured
to be 8.5 pm/V using Maker Fringe techniques. We also found CdTeMoO6 is type-I phase-matchable based on the calculated phase-matching
curves. Our results indicated that CdTeMoO6 single crystal
is an excellent birefringent material combined with a promising NLO
material for optoelectronic applications.
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