Measuring the Temperature and Intensity Distributions of Infrared Laser Radiation on the Surface of a Solid Body in a High-Pressure Cell

A new scheme of an optical system with separated channels for laser heating of a sample in a high-pressure cell and measurements of the distributions of temperature and intensity of infrared (IR) laser radiation is proposed. This separation was achieved by introducing a polarizing cubic beam splitter between the high-pressure cell and the objective of the optical system of the measuring channel. It is shown that the introduction of a beam splitter does not increase the chromatic aberrations of the optical system of the measuring channel nor does it distort the measured temperature distribution. In the scheme in the heating channel, a movable focusing lens provides a wide spot of high-power infrared laser radiation on the sample and a smaller temperature gradient. In this scheme, there is no overheating of the optical elements in the heating channel, which makes it possible to carry out a long-term effect of high-power laser radiation on the sample in high-pressure cells.