In order to enable optical systems to operate with a high degree of compactness and reliability it is necessary to combine large number of optical functions in small monolithic structures. A development, somewhat reminiscent of that that took place in Integrated Electronics, is now beginning to take place in optics. The initial challenge in this emerging field, known appropriately as "Integrated Optics", is to demonstrate the possibility of performing basic optical functions such as light generation, coupling, modulation, and guiding in Integrated Optical configurations. The talk will review the main theoretical and experimental developments to date in Integrated Optics. Specific topics to be discussed include: Material considerations, guiding mechanisms, modulation, coupling and mode losses. The fabrication and applications of periodic thin film structures will be discussed.

Integrated optics

Self-focusing of cosh-Gaussian laser beams in a parabolic medium with linear absorption

Density transition based self-focusing of cosh-Gaussian laser beam in plasma with linear absorption has been studied The field distribution in the plasma is expressed in terms of beam width parameter, decentered parameter, and linear absorption coefficient The differential equation for the beam width parameter is solved by following Wentzel–Kramers–Brillouin (WKB) and paraxial approximation through parabolic wave equation approach The behaviour of beam width parameter with dimensionless distance of propagation is studied at optimum values of plasma density, decentered parameter and with different absorption levels in the medium The results reveal that these parameters can affect the self-focusing significantly

http://iopscience.iop.org/article/10.1088/0253-6102/64/1/103/pdf

Density Transition Based Self-Focusing of cosh-Gaussian Laser Beam in Plasma with Linear Absorption

In this paper, we have investigated the propagation characteristics of cosh-Gaussian laser beam in magnetoplasma using relativistic nonlinearity. The field distribution in the medium is expressed in terms of beam width parameter an and decentred parameter b. An appropriate nonlinear Schraodinger equation has been solved analytically using variational approach. The behaviour of beam width parameter with dimensionless distance of propagation ξ for various b values is examined. Self-phase modulation and self-trapping is also studied under variety of parameters. Further, the effect of magnetic field on self-focusing of the beam have been explored.

Relativistic self-focusing and self-phase modulation of cosh-Gaussian laser beam in magnetoplasma

Silver layers up to 3 μm thick have been deposited at 250-510°C using a simple powder flash evaporation MOCVD procedure with a silver pivalate as the volatile precursor. Carbon-free deposits could be obtained at temperatures ≥ 310 °C. A very high deposition rate of 10 μm h -1 has been achieved. The silver layers were dense and conducting. Properties of silver pivalate, and the influence of deposition temperature on film microstructure, are discussed. The procedure is a cheap and robust route to silver coatings.

Low Temperature MOCVDof Conducting, Micrometer-Thick, Silver Films

The formation of spontaneous gratings induced by a polarized laser beam in thin photosensitive AgCl waveguide films, doped by Ag, was studied by means of small-angle scattering. It is shown that small-angle scattering is determined by the domain structure of the spontaneous gratings and arises because of the re-emission of waveguide modes by neighbouring domains. The instability and reorganization of the gratings have been found and studied upon the change of the azimuth of the laser beam polarization.

Study of spontaneous grating formation in photosensitive films by means of small-angle scattering

Holographic recording of visible-light spectra is carried out in vacuum-deposited thin AgCl-Ag films, serving as waveguide media. In the film, periodic structures, consisting of periodically redistributed colloidal silver particles, are recorded as a result of the interference between a linearly polarized incident beam and the TE-modes in the waveguide. The reconstructed spectra appear normal to the film surface, reproducing the original colour and polarization characteristics of the recorded light. When the holographic spectra are recorded through a polarizer in conjunction with a birefringent crystalline plate, the characteristic coloured band patterns appear on reconstruction which are similar to the patterns of polarized wave interference in crystalline plates.

http://iopscience.iop.org/article/10.1088/1464-4258/1/2/010/pdf

L A Ageev

Papers

Study of spontaneous grating formation in photosensitive films by means of small-angle scattering

Holographic recording of visible-light spectra in thin AgCl-Ag waveguide films

Peculiarities of spontaneous grating formation in photosensitive films under linearly and circularly polarized radiation

Peculiarities of spontaneous gratings formation on the radiative modes under circularly polarized radiation

Spontaneous gratings in light-sensitive AgCl–Ag films formed by a normally incident circularly polarized focused laser beam