Optical systems for research parameters of laser radiation transformed by infrared range diffractive elements

The optical systems for studying the parameters of laser radiation transformed by diffractive optical elements intended to operate in the infrared range have been created. The systems permit to register the intensity distribution formed by microoptics elements in different sections and give the possibility to measure their power efficiency. The optical systems experimental approvement has been conducted using reflective binary cylindrical lens and focusator to a point.This work has been carried out within the framework of the strategical academic unit ‘Nanophotonics, Perspective Technologies of Earth Remote Probing and Intellectual Geoinformation Systems’ (StrAU-3) of the Samara National Research University’s competitiveness improving program

Diagnostic stand for quality control of diffractive optical element manufacturing

A diagnostic stand has been created to study the parameters of laser radiation transformed by diffractive optical elements (DOE) designed for operation in the infrared range. The optical systems included in the stand allow recording the intensity distribution formed by the elements of micro-optics in different planes that is necessary to control the focusing quality and to estimate the focus depth. They also provide an opportunity to measure the DOE power efficiency. Experimental approbation of optical systems on the example of a reflecting binary cylindrical lens and a Fresnel lens has been carried out.This work has been carried out within the framework of the strategic academic unit ‘Nanophotonics, emerging technologies of Earth’s remote sensing and intellectual geoinformation systems’ of the Samara National Research University’s competitiveness improving program

Theoretical study of the photoconductivity mechanism of the structure “carbon nanotubes – silicon substrate”

The types of optical radiation photodetectors have been considered according to the operating principle. The photoconductivity mechanism of carbon nanotubes (CNTs) deposited on a silicon substrate has been investigated theoretically. A comparison of the CNTs band gap with illuminating beam the quantum energy has been conducted. The heating and cooling cycles under the influence of a distributed surface energy source have been simulated. It has been established that CNTs on a silicon substrate have thermal-type photoconductivity. The sensitive element of the IR sensor based on this structure can be classified as a bolometric type

Sensitive element of CNT-based IR-sensor

A literature review of the works presenting the results of CNT studies as optical range radiation sensors has been provided. In principle, the possibility of using a CNT sample as a sensitive element for detecting IR radiation has been shown. The dependence of the CNT sample resistance on the CO2-laser radiation intensity has been determined.This work was supported by the Federal Agency of Scientific Organizations (agreement No 007-GЗ/Ch3363/26) and has been carried out within the framework of the strategic academic unit ‘Nanophotonics, emerging technologies of remote sensing and intellectual geoinformation systems’ of the Samara National Research University’s competitiveness improving program.The sensor investigation was partly supported by the Ministry of Education and Science project No. 16.7894.2017.6.7