Phase noises research results of the laser interferometer for the SOIGA gravitational wave detector project

Gunin, P.M., Davlatov, R.A., Donchenko, S.S., Lavrov, E.A., Skakun, I.O., Sokolov, D.A.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Донченко С.С., Давлатов Р.А., Лавров Е.А., Соколов Д.А., Скакун И.О., Гунин П.М. Результаты исследования фазовых шумов лазерного интерферометра для проекта космического детектора гравитационных волн SOIGA // Оптический журнал. 2023. Т. 90. № 6. С. 3–14. http://doi.org/10.17586/1023-5086-2023-90-06-03-14

Donchenko S.S., Davlatov R.A., Lavrov E.A., Sokolov D.A., Skakun I.O., Gunin P.M. Phase noises research results of the laser interferometer for the SOIGA gravitational wave detector project [In Russian] // Opticheskii Zhurnal. 2023. V. 90. № 6. P. 3–14. http://doi.org/10.17586/1023-5086-2023-90-06-03-14

For citation (Journal of Optical Technology):

Sergey Donchenko, Ruslan Davlatov, Evgeniy Lavrov, Denis Sokolov, Ivan Skakun, and Pavel Gunin, "Analysis of phase noises in the laser interferometer for the SOIGA gravitational wave detector project," Journal of Optical Technology. 90(6), 289-295 (2023)

Abstract:

Subject of study. Sensitivity of the onboard interferometer layout for seminumerical modelling in SOIGA spaceborne gravitational wave detector project on GLONASS orbits. Aim of study. To evaluate and investigate sources of noise in the proposed implementation of a laser heterodyne interferometer which measures relative displacements of sample masses in the space gravitational wave antenna project. Method. Numerical modelling and experimental studies of the influence of layout components on measurement sensitivity of linear relative movement. Main results. The design of the SOIGA space gravitational wave antenna with different spacecrafts configurations is described. For intersatellite interferometric measurements, the transponder principle is proposed, where each spacecraft has a receiver and a repeater of laser radiation, which propagates in opposite directions. The principles of constructing an airborne heterodyne interferometer are described. A schematic layout of a ground layout for testing the basic technical solutions is proposed. Results of estimation of nonlinear optical noise for ambiguous optical paths of the interferometer, instability of the laser module frequency, temperature fluctuations, etc. are given in the paper. Studies of radiofrequency signals fed to acoustooptical modulators showed the absence of "ghost" harmonics at the heterodyne frequency; the optimum operating mode of the RF amplifier, in which higher harmonics do not contribute to measurement uncertainty, was also determined. The greatest contribution to the interferometer layout noise was made by temperature fluctuations. The total calculated noise budget does not exceed 20 pm in frequency range from 2 to 10 Hz. Suggestions for upgrading the layout to reduce noise to the required level (<30 pm) over the entire target frequency range from 100 mHz to 10 Hz are formulated. Practical significance. The results obtained in the work can be used in the development of the first Russian space gravitationalwave antenna.

Acknowledgment: the research was carried out with the financial support of the RFBR in the framework of the scientific project № 192911022\21.

Keywords:

inter-satellite laser interferometer, heterodyne interferometer, gravitational wave detection, interferometer noises, GLONASS

OCIS codes: 230.0230, 120.3180, 040.2840

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