rus
Portrait of The Company
M. V. Kuznetsov
Transformation of Laser Technologies DOI: 10.22184/1993-7296.FRos.2025.19.7.516.521
Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
The Research Laboratory “Laser and Additive Technologies” of the Institute of Mechanical Engineering, Materials and Transport of the Peter the Great St. Petersburg Polytechnic University (SPbPU) is a leading national research center in the field of laser, welding and additive technologies. The results of the LiAT IMMIT SPbPU have been implemented in many industrial projects that use Laser Welding and Surface Treatment, Laser Cladding, Hybrid laser arc welding and laser surface treatment. These technologies have proven to be highly effective in the fields of mechanical engineering, medicine, and oil and gas processing. We are talking with Mikhail Valeryevich Kuznetsov, Head of the Laboratory.
Transformation of Laser Technologies DOI: 10.22184/1993-7296.FRos.2025.19.7.516.521
Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
The Research Laboratory “Laser and Additive Technologies” of the Institute of Mechanical Engineering, Materials and Transport of the Peter the Great St. Petersburg Polytechnic University (SPbPU) is a leading national research center in the field of laser, welding and additive technologies. The results of the LiAT IMMIT SPbPU have been implemented in many industrial projects that use Laser Welding and Surface Treatment, Laser Cladding, Hybrid laser arc welding and laser surface treatment. These technologies have proven to be highly effective in the fields of mechanical engineering, medicine, and oil and gas processing. We are talking with Mikhail Valeryevich Kuznetsov, Head of the Laboratory.
Tags: laser cladding laser metal deposition and direct laser deposition laser welding and surface treatment лазерная наплавка лазерная сварка и обработка поверхности лазерное поверхностное упрочнение металла прямое лазерное выращивание
Technologies and Technology Equipment
Y. Aldaiee, D. A. Kuznetsova, M. E. Pirogov, M. V. Kuznetsov, A. A. Popovich
Evaluation of the Effect of Focal Plane Position on the Penetration Depth in Laser Welding of High-strength Steel DOI: 10.22184/1993-7296.FRos.2025.19.7.524.543
The article presents the results of laser welding of steel using the lenses with a focal length of 300, 500, 700 and 900 mm. The effect of focal plane position of laser radiation relative to the work surface of the welded plate on the weld penetration depth has been evaluated. The research is based on a series of experimental welding samples using the lenses with various focal lengths and controlled changes in the focal point relative to the welded plate surface. The results can be used to select the process modes for laser welding of thick high-strength steels and to develop recommendations for the equipment adjustment.
Evaluation of the Effect of Focal Plane Position on the Penetration Depth in Laser Welding of High-strength Steel DOI: 10.22184/1993-7296.FRos.2025.19.7.524.543
The article presents the results of laser welding of steel using the lenses with a focal length of 300, 500, 700 and 900 mm. The effect of focal plane position of laser radiation relative to the work surface of the welded plate on the weld penetration depth has been evaluated. The research is based on a series of experimental welding samples using the lenses with various focal lengths and controlled changes in the focal point relative to the welded plate surface. The results can be used to select the process modes for laser welding of thick high-strength steels and to develop recommendations for the equipment adjustment.
Tags: focal plane position focusing lenses laser welding penetration depth steel welded joint глубина проплавления лазерная сварка расположение фокальной плоскости сварное соединение сталь фокусирующие линзы
А. B. Lyukhter, P. E. Roslov, Y. S. Sheven, N. A. Markov, N. N. Davydov
Development and Testing of a Laser Radiation Emergency Shutdown System DOI: 10.22184/1993-7296.FRos.2025.19.7.544.556
The article presents experimental results of a study of the developed optoelectronic system for emergency shutdown of a laser radiation source, which ensures the safety of personnel when working with particularly powerful laser installations. The proposed system eliminates the possibility of a laser beam penetrating through the structure of the protective cabin enclosing the work area. A special feature of the technical solution is the use of hidden frameless photodetectors placed in the internal cavities of double-layer panels, which reduces the dimensions of the structure and simplifies the installation of the system in the structure of protective cabins.
Development and Testing of a Laser Radiation Emergency Shutdown System DOI: 10.22184/1993-7296.FRos.2025.19.7.544.556
The article presents experimental results of a study of the developed optoelectronic system for emergency shutdown of a laser radiation source, which ensures the safety of personnel when working with particularly powerful laser installations. The proposed system eliminates the possibility of a laser beam penetrating through the structure of the protective cabin enclosing the work area. A special feature of the technical solution is the use of hidden frameless photodetectors placed in the internal cavities of double-layer panels, which reduces the dimensions of the structure and simplifies the installation of the system in the structure of protective cabins.
Tags: emergency shutdown laser safety modular cabin optoelectronic system photodetector protective panel safety interlock аварийное отключение защитная блокировка защитная панель лазерная безопасность модульная кабина оптоэлектронная система фотодетектор
Lasers & Laser Systems
A. V. Reznikov, S. P. Nikitin, O. E. Naniy, G. Yu. Ivanov, E. A. Fomiryakov, A. Yu. Danilov, D. R. Kharasov, Yu. M. Sokolov, V. N. Treshchikov
E-LAS – a Low-Noise Narrowband C-band Laser with External Resonant Cavity DOI: 10.22184/1993-7296.FRos.2025.19.7.558.563
A narrow-band laser is a key component in the structure of the distributed sensors and security systems based on them, as well as in the coherent fiber-optic measurement systems (FOMS). Due to the highly coherent pulses of a narrow-band laser that provide a high-contrast interference pattern in the reflected signal, unique sensitivity of the optical fiber to the external influences is achieved. A narrow-band semiconductor laser has been successfully commercialized in Russia. This highly stable compact laser has many potential applications in the field of sensors, LIDAR systems, acoustic and seismic sensors, and radio-photonic devices.
E-LAS – a Low-Noise Narrowband C-band Laser with External Resonant Cavity DOI: 10.22184/1993-7296.FRos.2025.19.7.558.563
A narrow-band laser is a key component in the structure of the distributed sensors and security systems based on them, as well as in the coherent fiber-optic measurement systems (FOMS). Due to the highly coherent pulses of a narrow-band laser that provide a high-contrast interference pattern in the reflected signal, unique sensitivity of the optical fiber to the external influences is achieved. A narrow-band semiconductor laser has been successfully commercialized in Russia. This highly stable compact laser has many potential applications in the field of sensors, LIDAR systems, acoustic and seismic sensors, and radio-photonic devices.
Tags: coherent optical time domain reflectometer (cotdr) fiber-optic communication lines (focl) fiber-optic measurement systems (foms) instantaneous spectral linewidth narrow-band laser волоконно-оптические измерительные системы (воис) волоконно-оптические линии связи (волс) мгновенная спектральная ширина линии метод когерентного рефлектометра (cotdr) узкополосный лазер
Opto-electronic systems and complexes
A. L. Rukosuev, A. G. Aleksandrov, A. N. Nikitin, A. A. Soloviev, K. F. Burdonov, Yu. V. Sheldakova, A. V. Kudryashov
Stabilization of the Direction of Propagation of a Wide-Aperture Light Beam Using Quadrant Photodiodes DOI: 10.22184/1993-7296.FRos.2025.19.7.564.576
This article addresses the problem of stabilizing the propagation direction of wide-aperture laser beams when the beam size significantly exceeds the dimensions of standard quadrant photodetectors. Two fundamental stabilization schemes are analyzed: with dependent and independent control loops. It is shown that the former has a fundamental limitation due to the highly dependent nature of the influence matrix. As a solution, a system with two independent loops is proposed, which does not require matrix calculations and demonstrates high beam positioning accuracy sufficient for practical application in laser long-distance communication and focusing systems.
Stabilization of the Direction of Propagation of a Wide-Aperture Light Beam Using Quadrant Photodiodes DOI: 10.22184/1993-7296.FRos.2025.19.7.564.576
This article addresses the problem of stabilizing the propagation direction of wide-aperture laser beams when the beam size significantly exceeds the dimensions of standard quadrant photodetectors. Two fundamental stabilization schemes are analyzed: with dependent and independent control loops. It is shown that the former has a fundamental limitation due to the highly dependent nature of the influence matrix. As a solution, a system with two independent loops is proposed, which does not require matrix calculations and demonstrates high beam positioning accuracy sufficient for practical application in laser long-distance communication and focusing systems.
Tags: laser beam stabilization system laser long-distance communication quadrant photodetectors tilt corrector wavefront tilt correction квадрантные фотодиоды корректор наклонов коррекция наклонов волнового фронта лазерные системы дальней связи система стабилизации лазерного пучка
News
Materials & Coatings
V. G. Ralchenko, V. P. Pashinin, A. F. Popovich, A. P. Bolshakov, A. K. Martyanov, K. V. Zakharchenko, V. I. Konov, B. Dai
Diamond UV Detector with Graphite Electrodes Formed by Laser Ablation DOI: 10.22184/1993-7296.FRos.2025.19.7.578.586
A Diamond being a wide-bandgap radiation-hard semiconductor, is rather promising for the development of UV detectors, including the solar-blind ones. A version of an all-carbon UV detector has been implemented on a single-crystal CVD diamond wafer with the interdigital electrodes consisting of a system of shallow (near-surface) and deep graphitized grooves produced by laser ablation without any lithography. Simulation of the electric field distribution in the detector has demonstrated the advantage of using buried electrodes that provide a more uniform field distribution within the crystal. The photosensitivity spectra exhibit a sharp peak at 220 nm, with the buried electrodes providing a 75% higher response amplitude (14 A/W).
Diamond UV Detector with Graphite Electrodes Formed by Laser Ablation DOI: 10.22184/1993-7296.FRos.2025.19.7.578.586
A Diamond being a wide-bandgap radiation-hard semiconductor, is rather promising for the development of UV detectors, including the solar-blind ones. A version of an all-carbon UV detector has been implemented on a single-crystal CVD diamond wafer with the interdigital electrodes consisting of a system of shallow (near-surface) and deep graphitized grooves produced by laser ablation without any lithography. Simulation of the electric field distribution in the detector has demonstrated the advantage of using buried electrodes that provide a more uniform field distribution within the crystal. The photosensitivity spectra exhibit a sharp peak at 220 nm, with the buried electrodes providing a 75% higher response amplitude (14 A/W).