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    General formula for the natural width of optical parametric oscillator spectral lines
Chirkin, A. S.
/ A. S. Chirkin // Laser Phys. Lett. - 2020. - Vol. 17, Is. 11. - Ст. 115401, DOI 10.1088/1612-202X/abb6e6. - Cited References: 21 . - ISSN 1612-2011. - ISSN 1612-202X
РУБ Optics + Physics, Applied

Аннотация: A new approach to the quantum analysis of the spectral linewidths of optical parametric oscillators (OPOs) is proposed. The approach is based on introducing a Hermitian frequency deviation operator. The spectral linewidths in the triply resonant OPO above-threshold regime have been calculated. It has been found that the width of the generated spectral line depends on the loss at all interacting frequencies, the photon number of frequency under study, and the threshold photon number of pump. The formula obtained for the spectral width is general; in particular cases, it yields the well-known results. The developed simple approach can be applied to the quantum analysis of the spectra of various oscillatory systems, for example, the multifrequency parametric and non-linear optomechanical interactions and lasers.

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Держатели документа:
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia.
Moscow MV Lomonosov State Univ, Int Laser Ctr, Moscow 119991, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Чиркин, Анатолий С.
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    Domain structure and magnetization reversal in multilayer structures consisting of thin permalloy films separated with nonmagnetic interlayers
/ B. A. Belyaev, N. M. Boev, A. V. Izotov, P. N. Solovev // Russ. Phys. J. - 2021. - Vol. 64, Is. 6. - P. 1160-1167, DOI 10.1007/s11182-021-02436-w. - Cited References: 30. - This work was financially supported by the Ministry of Science and Higher Education under agreement No. 075-11-2019-054 November 22, 2019 . - ISSN 1064-8887. - ISSN 1573-9228
РУБ Physics, Multidisciplinary

Аннотация: Using numerical micromagnetic modeling, we have investigated the development of domain structure and magnetization reversal in multilayer thin-film structures. The permalloy (Ni80Fe20) magnetic layers had the inplane uniaxial and perpendicular magnetic anisotropy. We found that as the thickness of nonmagnetic interlayers decreases, the in-plane configuration of magnetic moments in the permalloy layers transforms from a single domain state to stripe domains, which is caused by the increase of magnetostatic interaction between layers. In structures with "thick" interlayers, even weak magnetostatic interaction enforces the neighboring single domain permalloy layers to have opposite orientations of magnetic moments. The saturation field of such samples increases linearly with the number of layers. By analyzing the dynamic characteristics of multilayers, we determined the optimum number of layers ensuring the maximum conversion efficiency of wideband microwave microstrip sensors of weak magnetic fields.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Izotov, A. V.; Изотов, Андрей Викторович; Solovev, P. N.; Соловьев, Платон Николаевич; Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission
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