ABSTRACT Perovskite alkaline niobate (XNbO3) nanowires are attracting lots of attention having a variety of interesting properties such as significant nonlinear optical response, pronounced birefringence, considerable piezoelectric, pyroelectric, photorefractive, and photocatalytic response, as well as superior mechanical and chemical stability. Their ability to efficiently generate second harm...

Semiconductor photocatalysis has been intensively studied in recent decades for a wide variety of application such as hydrogen production from water splitting and water and air treatment. The majority of photocatalysts are, however, wide band-gap semiconductors which are active only under UV irradiation. In order to effectively utilize visible solar radiation, this thesis investigates various t...

The local symmetry of (1-x)Na0.5Bi0.5TiO3-xKNbO3 (NBT-xKN, x = 0.01−0.07) ceramics was thoroughly examined using high-energy synchrotron x-ray scattering and analysed the pair distribution function (PDF) method. At room temperature, structure NBT-xKN (x best refined monoclinic C1c1 structures within local-range (r<22 Å) rhombohedral R3c medium-range (22 Å <r <52 Å). Furthermore, exists from tem...

Sub-five-cycle pulses in the spectral region from 2800 to 4600 nm are generated using a potassium niobate optical parametric amplifier employing a germanium pulse compression scheme. The sub-65-fs mid-infrared pulses are fully characterized by XFROG. 2002 Optical Society of America OCIS codes: (320.7110) Ultrafast nonlinear optics; (190.4970) parametric oscillators and amplifiers. Generation o...

A Franson-type test of the Bell-inequality is presented. Energy and time entangled photons at wavelengths of 704 and 1310 nm are produced by para-metric downconversion in KNbO3 and are sent through optical fibers into a bulk-optical (704 nm) and a fiber-interferometer (1310 nm), respectively. The two interferometers are located 35 meters aside from one another. Using Faraday-mirrors in the fibe...