We propose and analyze a scheme to enhance optomechanically-induced-transparency (OMIT) based on parity-time-symmetric optomechanical system. Our results predict that an OMIT window which does not exist originally can appear in weak optomechanical coupling and driving system via coupling an auxiliary active cavity with optical gain. This phenomenon is quite different from these reported in prev...

Femtosecond filamentation is an appealing self-organization phenomenon in optical physics that has been awaiting practical applications for a long time. First described some 20 years ago1, the collapse of the spatial beam profile of a femtosecond laser beam may lead to the formation of metre-long plasma channels in atmospheric air. These plasma channels resemble those generated by electric disc...

The emission-lines in the active galaxy IRAS 0421+0400 show a dramatic (∼ 900km s) increase in the velocity spread at the position of radio hot-spots which are located at the beginning of extended radio lobes. We study a simple geometric model of an opening outflow which reproduces the structure found in the long-slit emission-line spectrum of the hot-spot regions. The predicted bifurcations in...

The physical mechanism of phenomenon is explained as a result of inequality of forward and reversed processes in optics. The importance of experimental study of its invariance relation is discussed. There is rather usual situation in nonlinear optics when a phenomenon has mathematical description, but clear explanation of its physical mechanism is absent. Clear physical sense appears if we use ...

! Optical illusions are images that are visually perceived differently than how they actually appear in reality. These images can be very entertaining, but also very deceiving. Optical illusions are caused by either an error with oneʼs visual sense or an error of intellect. This " error of intellect " occurs when the visual senses correctly interprets an image, but the mindʼs imagination, false...

Using the recently discovered THermally induced Optical Reflection of Sound (THORS) phenomenon, it is possible to generate optically induced, local density barriers in air by absorption intense, modulated laser light (the THORS phenomenon), which results abrupt differences compressibility at these that can efficiently reflect incident acoustic waves. In this note, we demonstrate ability manipul...

Physical explanation of the origin of quantum resonances in a periodically kicked Bose-Einstein condensate is proposed. It is based on the assumption of inequality of the differential cross-sections of forward and partially reversed optical transitions. For quantitative determination of such differences, we propose to study the Bloch oscillations in a vertical optical lattice with short pulses ...

Advances in computer technology have dramatically increased raytrace speeds in optical engineering software. Increases in raytrace speed have, in turn, led to new methods for evaluating optical system performance. Designers traditionally evaluate imaging system performance with spot diagrams, MTF plots, ray aberration plots, and distortion plots. These tools are invaluable for two reasons: 1) t...

We present an overview of the physics of self-written waveguides created in photosensitive optical materials, including the experimental observations and the corresponding theoretical models for describing the growth of both bright and dark self-written beams. We discuss in more details the properties of self-written waveguides created in photosensitive polymers, which have been discovered in t...

New scheme of a real-time all-optical switching (AOS) was demonstrated as the fluorescence signal of cesium twophoton transition (TPT) with the control field. This work explored the optical phenomenon of the TPT with the control field that shares a common excited state, in which the TPT fluorescence is quenched under the control field intensity. The strong stimulated emission due to the control...