Magnesium‐doped near‐stoichiometric lithium tantalate crystals for nonlinear optics

Abstract

We investigate optical damage effects and coercive fields of LiTaO3 crystals and show that these properties may be tailored for applications in nonlinear optics by Mg doping and vapour transport equilibration treatments. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Growth of noncongruent LiTaO3 crystal by chemical vapor phase equilibration using niobium‐based two‐phase powder

“…We have demonstrated lithium‐rich and lithium‐deficient VPE strategies of using low‐cost two‐phase powder LiNbO 3 ‐Li 3 NbO 4 or LiNbO 3 ‐LiNb 3 O 8 to prepare a noncongruent NS or lithium‐deficient LT crystal. Like the previously proposed other technologies such as the Czochralski growth method and the VPE technique using the Li 2 O‐Ta 2 O 5 ‐based two‐phase powder, present VPE strategy based on the low‐cost Li 2 O‐Nb 2 O 5 ‐based two‐phase powder is also successful for preparation of a noncongruent LT crystal, and as an alternative it is more economic than the one based on the Li 2 O‐Ta 2 O 5 ‐based two‐phase powder, and is simpler, easier, and faster than the Czochralski growth method.…”

“…We have demonstrated lithium-rich and lithium-deficient VPE strategies of using low-cost two-phase powder LiNbO 3 -Li 3 NbO 4 or LiNbO 3 -LiNb 3 O 8 to prepare a noncongruent NS or lithium-deficient LT crystal. Like the previously proposed other technologies such as the Czochralski growth method [7][8][9][10][11][12] and the VPE technique using the Li 2 O-Ta 2 O 5 -based two-phase powder, [13][14][15][16] present VPE strategy based on the low-cost Li 2 O-Nb 2 O 5 -based two-phase powder is also F I G U R E 4 Lithium-deficient VPE-duration dependences of weight loss ΔG (red circle) and derived lithium-oxide molar content reduction ΔC(Li 2 O) (green circle) in an initial congruent LT plate with a weight 673.18 mg. The magenta solid line represents the best fit to the experimental data and the fitting expression is indicated [Color figure can be viewed at wileyonlinelibrary.com] successful for preparation of a noncongruent LT crystal, and as an alternative it is more economic than the one based on the Li 2 O-Ta 2 O 5 -based two-phase powder, and is simpler, easier, and faster than the Czochralski growth method.…”

“…the other hand, lithium-deficient LN or LT enables to increase rare-earth ion (like Er 3+ ) doping concentration (hence optical gain). Vapor phase equilibration (VPE) is an effective method to modify lithium concentration in the LN or LT. As an alternative to Czochralski growth method, [7][8][9][10][11][12] an NS/lithium-deficient LN or LT can be prepared by performing lithium-rich/deficient VPE on a congruent plate, and it has been proved for the NS LT. [13][14][15][16] In principle, the VPE for preparation of an NS or lithium-deficient LN should use the Li 2 O-Nb 2 O 5 -based two-phase powder LiNbO 3 -Li 3 NbO 4 or LiNbO 3 -LiNb 3 O 8 , and that for growth of an NS or lithium-deficient LT should use the Li 2 O-Ta 2 O 5 -based two-phase powder LiTaO 3 -Li 3 TaO 4 or LiTaO 3 -LiTa 3 O 8 . [13][14][15][16] Present work aims to demonstrate the VPE strategy of using the low-cost Li 2 O-Nb 2 O 5 -based two-phase powder to prepare an NS or lithium-deficient LT crystal.…”

Zone-leveling Czochralski growth and characterization of undoped and MgO-doped near-stoichiometric lithium tantalate crystals

“…The value in the case of the undoped SLT crystal was slightly higher than the reported value 1.8 kV/mm [10]. Using the values of the coercive field, the Li/Ta ratio was calculated with the help of an equation given by Wirp et al [20] for undoped SLT. Comparison of the Li/Ta ratio calculated using Wirp's equation with that measured by ICP-AES is shown in Fig.…”

Preparation, Properties, and Applications of Near Stoichiometric Lithium Tantalate Crystals

“…Low coercivity field requires lower electric field strength to conduct domain inversion [23], so the voltage used for domain inversion of NSLT crystal is lower. Wirp et al [24] fitted the relationship between Li concentration and coercive field strength according to the formula. As shown in Figure 2, the coercive field and internal electric field of LT crystal decrease with the increase of Li content.…”