najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2016-7-2-384-393najo-841Research ArticleCONTRIBUTED TALKSCONTRIBUTED TALKSLaser generation without inversion on the fine levels of the helium atomLaser generation without inversion on the fine levels of the helium atomPetrashenA. G.PetrashenA. G.

197101, Saint Petersburg

197101, Saint Petersburg

apetrashen@mail.ruSytenkoN. V.SytenkoN. V.

197101, Saint Petersburg

197101, Saint Petersburg

ITMO UniversityITMO University20161308202572Special Issue384393Copyright © Petrashen A.G., Sytenko N.V., 20252025Petrashen A.G., Sytenko N.V.Petrashen A.G., Sytenko N.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/841

By using the example of transfer between fine structure levels in the helium atom, the possibility of laser generation without inversion has been studied.

By using the example of transfer between fine structure levels in the helium atom, the possibility of laser generation without inversion has been studied.

coherent exitationdehsity matrix evolutiondark statescoherent exitationdehsity matrix evolutiondark statesThis work was partially financially supported by the Government of the Russian Federation (grant 074U01), by Ministry of Science and Education of the Russian Federation (GOSZADANIE 2014/190, Projects No. 4.Z50.31.0031 and No. 1.754.2014/K), by grant 16- 11-10330 of Russian Science Foundation.This work was partially financially supported by the Government of the Russian Federation (grant 074U01), by Ministry of Science and Education of the Russian Federation (GOSZADANIE 2014/190, Projects No. 4.Z50.31.0031 and No. 1.754.2014/K), by grant 16- 11-10330 of Russian Science Foundation.ReferencesKocharovskaya O., Hanin Ia.I. Coherent amplification of the ultra shot impuls in the three level madium without the population iunversion. Letters to JETP, 1988, 48, P. 581–583.Kocharovskaya O., Hanin Ia.I. 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The authors declare that there are no conflicts of interest present.