Potassium titanyl phosphate

Only certain types of crystalline materials can exhibit second harmonic generation (61). Because of symmetry considerations, the coefficient must be identically equal to zero in any material having a center of symmetry. Thus the only candidates for second harmonic generation are materials that lack a center of symmetry. Some common materials which are used in nonlinear optics include barium sodium niobate [12323-03-4] Ba2NaNb O lithium niobate [12031 -63-9] LiNbO potassium titanyl phosphate [12690-20-9], KTiOPO beta-barium borate [13701 -59-2], p-BaB204 and lithium triborate... 

In the case of SHG in waveguide nonlinear crystals, we describe a theoretical model which accounts for the temporal behavior of the interacting pulses and the possible z-dependence of the phasematching condition. The model also describes the observed saturation and subsequent decrease in SHG conversion efficiency in the waveguide samples, as a result of two-photon absorption (TPA) of the second harmonic (SH) wave. The results of this model are later compared with experimental data from SHG experiments using femtosecond pulses in the waveguide nonlinear crystals of periodically-poled potassium titanyl phosphate (ppKTP) and appKTP. This model is presented in section 2.3. 

LAUDISE What Is Materials Chemistry Potassium Titanyl Phosphate... 

In our laboratory we use the 1064-nm output of an injection-seeded Nd YAG laser that pumps a potassium titanyl phosphate (KTP) OPO/OPA assembly. This system produces 3.5nanosecond pulses and tunable IR from 2.5 pm (4000 cm ) to 5 pm (1975 cm" ) with energies available at the interface ranging from 4 mJ to 1 mJ at the two respective limits. It operates with 1 cm" resolution and has a variable repetition rate (1-100 Hz). 

Hydrothermal recrystallization is not conhned to quartz. Some II-VI compounds, such as ZnSe, ZnTe, CdSe, and CdTe, have also been recrystallized into large single crystals using the technique (Kolb, 1968), as well as aluminum orthophosphate, AIPO4 (Kolb, 1980). The technique can also be used preparatively as in the case of potassium titanyl phosphate (Laudise et ah, 1986) ... 

ADP = Ammonium Dihydrogen phosphate, NH4H2PO4 AlPO = A framework aluminophosphate HUP = Hydrogen uranyl phosphate KDP = Potassium Dihydrogen phosphate, KH2PO4 KTP = Potassium Titanyl Phosphate, KTi0P04 NASICON = Sodium Superionic Conductor. 

Solid phosphates show a huge variety of crystal structures, and it is not practical to classify them in terms of structural types as is done with simple oxides, halides, etc. However, some general classes of metal phosphate structures will be considered three-dimensional frameworks of linked phosphate tetrahedra and tetrahedrally or octahedrally coordinated cations, layered phosphates, and phosphate glasses. In all of these materials the size and topology of pores within the structure are of importance, as these determine the ability of ions and molecules to move within the structure, giving rise to useful ion exchange, ionic condnction, or catalytic properties. Ion exchange can also be nsed to modify the properties of the host network, for example, the nonlinear optical behavior of potassium titanyl phosphate (KTP) derivatives. 

The experimental values of 33 are mueh larger than those reported for other materials suitable for blue conversion ap-plieations, like potassium titanyl phosphate, and are approximately equal to those determined for lithium niobate [153]. 

Potassium titanyl phosphate, K TiO PO4 (KTP), is a much favoured material for use in optoelectronics. It is widely used for second harmonic generation of Nd lasers emitting near 1 mm, and is a superior material for many optical waveguide applications. 

---