[Swept source optical coherence tomography: a technology review]. / 'Swept source' - opticheskaia kogerentnaia tomografiia: obzor tekhnologii.

The article reviews the concept of swept source optical coherence tomography (SS-OCT) and presents a brief history of the technology, its implementation in modern commercial tomography, the advantages and disadvantages of the method.

[Photoacoustic monitoring of chorioretinal complex during laser coagulation of ocular fundus]. / Optiko-akusticheskii monitoring khorioretinal'nogo kompleksa pri lazernoi koagulyatsii tkanei glaznogo dna.

The effect of laser treatment on ocular fundus tissues depends on quite a number of factors, mostly uncontrollable, hence, laser output parameters may vary dramatically even within the same fundus. In classical procedure ('threshold' laser coagulation), these parameters are adjusted to ophthalmoscopically visible tissue color changes at the site of coagulation. However, this method does not work with modern subthreshold techniques, that are more tissue-saving and thus, produce no immediate and visible changes in the retina. Calculation methods that are used instead are much less accurate. Photoacoustic monitoring may become a real breakthrough in this field. The method involves acoustic analysis of the response to soft and short laser pulses ('test' pulses). Heating of the target by the main therapeutic laser causes alterations in its physical properties and, consequently, the laser-induced acoustic signal. This gives us an ability to monitor the temperature and thus, to evaluate the clinical effect of coagulation despite the absence of visible changes at the site. The most promising techniques of photoacoustic monitoring that are being developed are discussed here.

[Specification of reflectometric measurement complex to evaluate optic density of macular pigments and concentration of phototoxic chemicals in retina].

Suggestion is to specify reflectometric measurement complex based on digital multisensor imaginery fundus-camera, in order to evaluate optic density of macular pigments and concentration of phototoxic chemicals in human retina. The authors presented a review of role played by macular pigments (zeaxanthine and lutein) in human eye viability, analyzed yellow spot as a protective light filter against harmful effects of short-wave light, increasing optic image quality in human eye and responsible for colour vision. Role of evaluating the individual density of macular pigments was stressed as a forecasting efficient criterion of occupational selection in operators performing visual tasks of detection, distance and dimensions measurement for remote objects, monitoring the changeable circumstances.

Spatiotemporal period doubling in a nonlinear interferometer with distributed optical feedback.

A single-pass nonlinear interferometer with feedback field rotation is considered. Increasing feedback gain results in excitation of spatial subharmonics that distort optical reverberators, which are basic output patterns of the system. Features of the period-doubling process depend on the number of the reverberator's petals. A new spatiotemporal effect is observed: A basic structure with an odd number of petals is perturbed not by a static subharmonic but by a rotating wave.