In this paper, we present a review of the latest results obtained in the scope of ghost imaging using auxiliary multiplex channels. The proposed methods make it possible to increase the speed of image acquisition, as well as eliminate distortions in the signal of a bucket detector. One of the most serious limitations of ghost imaging is the large number of measurements required. During the data acquisition, the optical environment where the observation object is located may change its parameters, which will negatively affect the quality of the reconstructed image. To solve these problems, it is possible to use fast spatial light modulators to set structured patterns and fast detectors. However, such equipment is not available in some spectral ranges and is not able to suppress distortions in the detected signal. In this regard, our team has proposed a number of techniques to solve the problems of a large number of measurements and non-stationarity of the optical medium in ghost imaging systems. First of all, an auxiliary polarization channel method was presented in a ghost imaging system to eliminate distortion in the signal of a bucket detector. Secondly, wavelength multiplexing methods have been proposed in the visible and terahertz wavelength ranges. These methods will make ghost imaging systems more applicable to the tasks of remote sensing and mapping of areas in various spectral ranges.
The features of a liquid jet-based broadband terahertz (THz) generator that includes an optical part and system for a liquid jet formation are described. This system is based on the trapezium-shaped slit-type nozzle, the output of which is limited by two parallel blades. The applications of this generator for studying the optical-to-THz conversion efficiency for various liquids and THz energy temperature dependence are demonstrated. A trend for a decrease in the optical-to-THz conversion efficiency when using high-temperature water is revealed. This trend is interpreted through the increase in the THz wave absorption of the water jet. This system allows to achieve the optical-to-THz conversion efficiency up to 0.1% in the case of α-pinene double-pulse excitation.
In this paper we present the results of both experimental and theoretical study of terahertz waves energy enhancement during liquid jets double-pulse excitation. The dependence of the terahertz radiation energy on mutual ratio of the pre-pulse and signal pump energies is investigated. Temperature dependence in the case of double-pulse irradiation reveals unexpected features displaying both exponential growth and decrease with a 18° optimal value.
The program of workshops on photonics and optoinformatics was created at Department of Photonics and Optical Information Technologies in ITMO University by specialists in scientific and educational areas. These workshops are carried out for students of the best schools of Saint-Petersburg specialized in physics and mathematics, such as Gubernatorial Lyceum and Presidential Lyceum, and best schools of Russia. Every year about 500 of school students come to our workshops, including Annual summer educational practice.
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