Measuring of laser radiation polarization state with three profile bolometric gratings

Measuring methods of the polarization state of the intense and wide-aperture laser radiation with three profile biometric gratings are grounded. Knowledge of the dependence of the bolometer transformation coefficient on effective linear incident radiation intensity allows to determine coefficient of non-uniformity of incident radiation intensity distribution across entire gratings aperture, polarize coefficients of radiation interaction with bolometers, and straight radiation intensity from the signals of each bolometric elements via step-by-step approximation. Values of normalized transformation coefficients of each grating and linearized signals of gratings are determined with obtained radiation parameters. The linearized signals of gratings give us the possibility to consider three methods of determination of parameters of linear polarization of radiation in optic beam cross-section, and also parameters of elliptic polarization of radiation: relative semi-axes of ellipse, their angle directions in beam cross-section, and cosine of lagging angle between electric components of electromagnetic radiation. The dominant systematic errors at the expense of nonlinearity of bolometer transformation characteristic are eliminated in grounded methods. Errors of measured parameters of laser radiation state are analyzed.