Thermo-optical aberrations of radially symmetric diffractive optical elements

Analytical relations that define the temperature dependence of the third-order aberration coefficients for a radiaplly symmetric diffractive optical element were derived. Also, a condition for eliminating thermal defocusing in a diffractive-refractive singlet was obtained. Possibilities of correcting aberrations in a wide temperature range for a single diffractive optical element and diffractive-refractive singlet were analyzed.