Yu. M. Popov

Three-dimensional modes of a symmetric nonlinear plane waveguide

Abstract The three-dimensional problem of a symmetric nonlinear plane waveguide, which consist of a linear medium layer surrounded by nonlinear media, is investigated. The stationary solution of this problem is a mode whose field is falling to zero at infinity in all directions perpendicular to the propagation direction. The even, odd and assymetrical solutions of the problem are obtained.

Stripe nonlinear surface waves

Abstract A three-dimensional problem on the bound waves at the linear-nonlinear medium interface is considered. The stationary solution of this problem is a stripe nonlinear surface wave whose field is falling to zero at infinity in all directions perpendicular to the propagation direction.

Full color TV projector based on A2B6 electron-beam pumped semiconductor lasers

The description of full color TV projector is given. Three primary colors (red, 620 nm; green, 540 nm; blue, 455 nm) are obtained by means of A2B6 e-beam pumped semiconductor lasers. The laser element size is 5 cm. For laser pumping and laser beam controlling, cathode-ray tubes are used. Maximum light output in white is 3000–5000 lm (9–15 W). A full color picture is obtained on a 5 m viewing screen (12 m2). The size of the laser element is 5 cm. High resolution (up to 2000 pixels per line) gives a possibility to use such a projector in HDTV. The main characteristics of the basic elements are given. It is supposed to begin the development of TV projector with a light output to 104 lm.

Stripe nonlinear waves in a symmetrical planar structure

Abstract A three-dimensional stationary problem of the bound modes in a symmetrical planar nonlinear waveguide is considered. Modes limited in two directions, and propagation in the third direction (“stripe” modes)are obtained for saturable selffocusing films bounded by linear media in “antiwaveguiding” and “waveguiding” geometry.

Multistability in optical transmittance of spatial light modulators with internal feedback

Abstract A multistable spatial optical device has been developed on the basis of a spatial light modulator which contains photosensitive and electrooptical liquid crystal layers where an internal feedback loop is established.

Bistable properties of spatial light modulator with internal feedback

Abstract A bistable spatial optical device has been developed on the basis of a spatial light modulator which contains photosensitive and electrooptical liquid crystal layers, where an internal feedback loop is established.

E-Beam Longitudinally Pumped Laser Based on ZnCdSe/ZnSe MQW Structure Grown by MBE on ZnSe(001) Substrate

Electron beam longitudinally pumped laser based on 15 ZnCdSe/ZnSe QW periodic-gain structure grown by molecular beam epitaxy on ZnSe(001) substrate was studied. An output power of 0.3 W was achieved. The laser wavelength was in 518-536 nm range, being at the short wavelength side of the QW emission line at low excitation level. Such unusual feature was explained by the participation of excited QW levels in the creation of the optical gain.

High-power laser diodes of wavelength 808 nm based on various types of asymmetric heterostructures with an ultrawide waveguide

The parameters of high-power multimode laser diodes featuring a radiation wavelength of 808 nm obtained on the basis of asymmetric heterostructures with an ultrawide waveguide in the systems of AlGaAs/GaAs and (Al)GaInP/GaInAsP/GaAs are compared. In the lasers based on an AlGaAs/GaAs system, the maximum optical power was limited by optical degradation of the SiO2/Si mirrors and amounted to 4.7 W. In the lasers based on an (Al)GaInP/GaInAsP/GaAs system, the maximum optical power was limited by thermal saturation and equaled 7 W. The obtained results show that the (Al)GaInP/GaInAsP/GaAs system is more reliable from the standpoint of an increase in both the maximum optical power and operation life of lasers.

Electron Beam Pumped MQW InGaN/GaN Laser

E-beam pumped lasers are attractive for Laser Cathode Ray Tubes (LCRT) in projection displays and a variety of applications typically associated with optically pumped lasers. For the first time an InGaN/GaN multiple quantum well (MQW) in-plane laser pumped by surface normal pulse and scanning electron beams was demonstrated. Pumping at room temperature (RT) and 80 K showed peak stimulated emission wavelengths of 402 and 409 nm with a full width half maximum (FWHM) of 0.6 nm and 1.2 nm, respectively. The threshold electron beam current densities have been estimated as 60 A/cm 2 for 35 keV electron energy at 80 K using scanning e-beam pumping and 200-300 A/cm 2 at RT using pulsed e-beam pumping with a maximum electron energy of 150 keV. At 80 K, light output of 150 mW was measured out of one facet at an e-beam current of 1.7 mA.

Angle-dependent nonlinear modes of a cylindrical waveguide

Solutions of the wave equation for a cylindrical waveguide with cladding in which the dielectric constant depends nonlinearly on the optical field are obtained by numerical methods. We consider both saturable and nonsaturable nonlinearities. Asymmetrical solutions for which the field distributions have no axial symmetry are found. It is shown that the energy of such modes is less than the energy of the axially symmetric modes. The asymmetric modes exist in an interval of wave vectors n above a minimum value n0 at which the branching of the asymmetric mode away from the symmetric one first occurs. The dependences of the total energy and the value n0 on the core diameter are obtained by expanding the field in powers of (n − n0). Solutions that are periodic in angle with several maxima and minima along the interface of the core and the cladding are also considered.