Control of the VCSEL spectrum by dual microwave frequency modulation.

We propose and investigate a method for controlling the spectrum of the vertical-cavity surface-emitting laser by simultaneous modulation of the injection current at single and doubled frequencies. We experimentally demonstrate the ability to control the power asymmetry of the first-order sidebands and to suppress the carrier by the proposed method. These possibilities are beneficial to improve frequency stability of atomic clocks based on the effect of coherent population trapping.

Specific features of the VCSEL spectra under microwave current modulation.

The optical spectrum of a vertical-cavity surface-emitting laser under microwave frequency current modulation is asymmetric in most cases, i.e., sidebands equidistant from the carrier have unequal powers.

[Correction of neurological complications after transpedicular stabilization of the spine].

Nowadays transpedicular fixation systems have gained great priority in stabilization of thoracic and lumbar spine. But implantation of the system may cause iatrogenic complications due to extrapedicular insertion (malposition) of screws. Present work is devoted to analysis of neurologic disturbances of screw malposition in the prospective study of 44 consecutive patients.

[The treatment of middle-aged and elderly patients suffering from trochanteric fractures of the femur].

Treatment of 198 elderly patients with trochanteric fractures included different conservative and operative therapy methods. For the first time in Russia a new approach of extrafocus osteosynthesis was recommended for "decompensated" patients. It is proved, that for this category of the injured, active surgery tactics results in a considerable improvement of treatment outcome.