Quasi-phase-matched optical parametric oscillator with periodically poled stoichiometric LiTaO/sub 3/

Optical Parametric Generators and Amplifiers

“…4 shows the distribution of the MIR power in PPKTP optical parametric oscillator generating 1.5 W of average power in a 1.72 µm signal and a 2.789 µm idler [46]. Recently, this family of oxide ferroelectrics, where QPM structures have been realized and are of interest for the MIR spectral region, was joined by KNbO 3 [47] and near-stoichiometric compositions of LiNbO 3 [48] and LiTaO 3 [49,50]. The latter crystals are substantially easier to pole than their congruent counterparts.…”

Fabrication of Proton‐Exchange Waveguide Using Stoichiometric LiTaO3 for Guided Wave Electrooptic Modulators with Polarization‐Reversed Structure

“…The effective index of the modulation microwave was also calculated as n m = 4.55 from the dielectric constants of SLT and the structure of the coplanar asymmetric electrodes with a hot electrode of 14 μm in width and an electrode separation of 33 μm. As a result, Advances in OptoElectronics the length for the polarization-reversed and nonreversed region for the quasi-velocity-matching was obtained as L = 4.44 mm for the peak modulation frequency at 15 GHz from (2). The calculated frequency response of the QVM modulator is shown in Figure 4 when the electrode length for modulation L t is set as 7 times that of L (L t = 31 mm).…”

“…Recently, optical-quality stoichiometric LiNbO 3 (SLN) and stoichiometric LiTaO 3 (SLT) crystals have been attracting a lot of interest due to their excellent characteristics as a material for optical functional devices; small coercive electric field for polarization reversal, excellent nonlinear optic (NLO) and electrooptic (EO) characteristics, and small defect density [1][2][3][4][5]. Several studies on the optical wavelength conversion devices using NLO effects in SLN and SLT have been reported, however, there are few reports on their applications to EO devices.…”

Research on defects and domain characteristics of MgO-doped near-stoichiometric lithium tantalate in room-temperature polarization process

“…In nonlinear optical applications, periodically poled LiTaO 3 is the most attractive material for frequency conversion, because of its wide transparency range, large nonlinear coefficients, and high resistance to optical damage [1]. Owing to its lower defect density, coercive field in stoichiometric lithium tantalate (SLT) is one order of magnitude lower than that in the congruent type (CLT) [2], thus greatly facilitating the electrical poling of long and thick crystals with good uniformity of domain structures for high-power quasiphase-matched (QPM) frequency conversion. Kitamura et al developed double-crucible Czochralski technique to grow stoichiometric lithium tantalate [3][4][5] and fabricated QPM devices with the grown crystals [6][7][8].…”