Flux growth and optical properties of Na3La9O3(BO3)8 crystals

Borates: A Rich Source for Optical Materials

“…The absorption edge of approximately 270 nm was determined for Na 3 La 9 O 3 (BO 3 ) 8 crystal, which is thought to be attributable to the full connectivity of [BO 3 ] units with terminal oxygen atoms. The Sellmeier equations fitted by the least squares fitting method reveal that Na 3 La 9 O 3 (BO 3 ) 8 crystal has a large birefringence of Δ n = 0.086@1064 nm, which shift the shortest type I SHG phase matching wavelength (288 nm) to very close to its absorption edge . That means that the THG of Nd:YAG laser could be realized in Na 3 La 9 O 3 (BO 3 ) 8 crystals.…”

“…The Sellmeier equations fitted by the least squares fitting method reveal that Na 3 La 9 O 3 (BO 3 ) 8 crystal has a large birefringence of Δn = 0.086@1064 nm, which shift the shortest type I SHG phase matching wavelength (288 nm) to very close to its absorption edge. 365 That means that the THG of Nd:YAG laser could be realized in Na 3 La 9 O 3 (BO 3 ) 8 crystals. The sole non-zero independent SHG coefficient, i.e., d 22 , was found to be d 22 = (5.925 ± 0.171) × d 36 (KDP) = (2.31 ± 0.07) pm/V, which is even larger than those of β-BaB 2 O 4 and LiB 3 O 5 .…”

The mechanism for the nonlinear optical properties in La9Na3B8O27, La2Na3B3O9and La2CaB10O19:ab initiostudies

“…It is shown that L9NB and LCB have direct band gaps of 3.31 eV and 4.72 eV, respectively, while L2NB has an indirect band gap of 2.70 eV. These calculated values are smaller than the experimental data (5.53 eV for L9NB [9], 5.86 eV for L2NB [10] and 7.31 eV for LCB [11]). It is because LDA usually underestimates the energy band gap for wide-gap insulators due to the discontinuity of XC energy [30].…”

“…The energy band gaps for the three compounds are larger than 5.5 eV, i.e. their UV absorption cutoffs are less than 230 nm [9][10][11]. Moreover, the second harmonic generation (SHG) effect in L9NB is about five times as strong as that of KDP (~0.39 pm V −1 ) [6], while the SHG effects in L2NB and LCB are about twice as strong as that of KDP [7,8].…”

X-ray photoelectron spectroscopy and full potential studies of the electronic density of state of ternary oxyborate Na3La9O3(BO3)8

“…The investigated crystals were grown by the top-seeded solution growth (TSSG) method from three new fluxes: Na 2 O-B 2 O 3 -Li 2 O, Na 2 O-B 2 O 3 -NaF-LiF and Na 2 O-B 2 O 3 -NaF, respectively. The results showed that the Na 2 O-B 2 O 3 -NaF flux is more suitable than others for growing of NLBO crystals [3]. Na 3 La 9 B 8 O 27 crystals are non-hygroscopic, and possess stronger nonlinear optical effect and good mechanical properties.…”