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DOI: 10.17586/1023-5086-2023-90-05-41-49
УДК: 621.373:535
Simultaneous generation of N coherent pulses of various areas under the self-diffraction in 87Rb vapours
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Publication in Journal of Optical Technology
Багаев С.Н., Мехов И.Б., Чехонин И.А., Чехонин М.А. Одновременная генерация N когерентных импульсов с различной площадью при самодифракции в парах 87Rb // Оптический журнал. 2023. Т. 90. № 5. С. 41–49. http:doi.org/10.17586/1023-5086-2023-90-05-41-49
Bagaev S.N., Mekhov I.B., Chekhonin I.A., and Chekhonin M.A. Simultaneous generation of n coherent pulses of various areas under the self-diffraction in 87Rb vapours [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 5. P. 41–49. http:doi.org/10.17586/1023-5086-2023-90-05-41-49
Subject of study. The process of self-diffraction of a resonant pulse in a dense extended resonant medium was studied for the first time, which leads to an angular deflection of the output radiation and sequential emission of a large series of N pulses with a variable area in the range (–3p … 0 … 3p). The pulses are emitted from a small focusing region (0.1–1 mm) of the pump pulse in a dense extended resonant medium. The pulse wavelength corresponds to the resonant transition D2 87Rb (wavelength 780.24 nm). Aim of study is to study the nonlinear effect of self-diffraction of a laser pulse with a cylindrical wave front in an extended resonant medium of rubidium vapor with the aim of developing new resonant microwave photonics devices using laser signal processing methods in the microwave spectrum. Method. In the caustic of a focused beam of a laser pump pulse with a cylindrical wave front, a transverse spatial profile of the electric field strength of a special shape f(x) is created. The pump pulse must have a converging (for example, cylindrical) wave front. The computer synthesized holograms developed by us can be used to create an arbitrary f(x) profile. Main results. The effect of self-diffraction of a pump pulse, which is accompanied by the process of emission of a series of N coherent resonant pulses with different areas in the range (–3p … 0 … 3p) from a short focusing region (0.1–1 mm) of a resonant laser pump pulse, is studied. With self-diffraction of the pump pulse, the number of emitted pulses with different areas reached 16. The distribution of series pulses over the diffraction angle was observed in the range of angles from –5° to +4°. At certain angles, nonlinear generation of 0p-pulses was observed. It is shown that the described method of nonlinear generation of 0p-pulses over a short interaction length between light and a resonant medium has been proposed for the first time. Practical significance. The obtained results of studying the effect of self-diffraction of a resonant pulse with a transverse spatial profile f(x) will serve as the basis for the development of prototype devices for signal processing problems using low-power laser diodes.
self-diffraction, pulse area, quantum microwave photonics, computer-generated hologram
OCIS codes: 230.1150, 050.1970, 090.2890
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