<title>Optimization of tunable CO<formula><inf><roman>2</roman></inf></formula> laser outputs by automated setting of intracavity emission polarization for each line</title>

Abstract

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.

Automatized tunable CO laser for medicine, ecology, and laser media and material study

“…This lowers essentially the labor efforts and increases efficiency and information density of the investigations [2,3,4]. The results of investigations of the first model of automated CO-laser, assembled on the basis of SAE GL-509 with the average life-time 2,000-3,000 hours, were presented earlier [5,6].…”