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The present paper is concerned with automatic optimization of tunable C02 laser emission power that has been realized by changing the in-resonator polarization direction.We have begun with the investigation into the experimental reflection efficiency of the grating in use for first and zero diffraction orders as a function of the incident polarization plane orientation relative to the grating line length obtained from the first-order Littrow system. The dependencies measured were then used to determined the angle y(J) between the grating line length and the polarization vector such that the zero-order reflection factor was equal to its optimal value that is a function ofthe active medium gain for the J-th line, active length, and useless loss inside the laser cavity. After this, the monitoring and control software of the laser has been enhanced with the y(J)-values found out in accordance with the above procedure for each laser line associated with its intrinsic gain. Hence, the laser tuning in J-th line is accompanied with automatic orientation ofthe Brewster window at the angle y(J).Due to the given optimization we were able to acquire for each particular line the highest power at the maximum line amount in the output spectrum.

A novel automatic output stabilized tunable CO2 laser has been developed providing a new quality level of investigations in the areas of atmosphere monitoring, active media diagnostics, spectroscopy, etc. The optimally designed and arranged laser is composed of sites and systems with reliable operational resources. Mean time till failure of the laser is 1000 h. About 0.3 cm' resolution of its high-Q and highly selective resonator allows extraction of most lines in sequence and hot bands without using a hot cell in the laser cavity. The laser is also distinguished among many other lasers by generating a high power (up to 50 W) at traditional lines and a great amount (near 160 totally) of sequence and hot lines (up to 10 W) inthe 9-12 tm range which can be qualitatively changed in favor of sequence or hot lines by replacing some of the sealed-off active element or the whole set of them. Software and hardware developed for handling the laser operation offer the possibility to extract a needed set of lines in any succession and with a required run duration.

In the article the prcject ofa laser channel ofremote power transmission in space is shown. hi details is circumscribed elements and system for implementation ofexperiment on power transmission, within the frame ofthe possible scientific and applied projects of experiments on the International Space Station (ISS), on a distance more l000m with a level ofpow more than 1000W. The capability ofincrease ofpower ofradiation is shown. The capability of reaching efficiency ofa channel ofpower transmission up to 30% is designed. Also in the article a number ofpossible additional applications ofthe given system -data transfer with high speed and measurement ofgeometric parameters of interposition "satellite -satellite" is shown. The article contains analysis ofusing achannel power transmission for informationmeasuring whole.