Department of laser spectroscopy

Department of laser spectroscopy provide fundamental and applied researches in such domains:

  • Laser spectroscopy;
  • Physics of lasers;
  • Laser standard of time, frequency and length;
  • Resonant interaction of laser radiation and atoms, molecules, micro- and nanoparticles, biological systems;
  • Laser instrument engineering.

Main facilities and experimental methods:

  • iodine frequency stabilized He-Ne laser, cw and pulsed (Q-switched, modelocked femtosecond) lasers; gaseous (He-Ne, Ar+, excimer), solid-state (Nd:YAG), semiconductor: Toptica DL 100, home made single-frequency and frequency-shifted feedback diode lasers;
  • laser elements (dye doped polymer Q-switch modulators, iodine absorption cells, laser heads and discharge chambers of compact eximer lasers), holography elements for laser beams transformation and formation;
  • sub-Doppler spectroscopy of nonlinear absorption and nonlinear dispersion, absorption and fluorescence laser spectroscopy; optical heterodyne characterization of frequency stabilized lasers;
  • optical spectrometers, spectrophotometers, monochromator (Ocean Optics, Solar, LOMO etc), anti-vibration optical tables, acoustics and electrical noises protected room.
  • A new branch of the laser physics has been developed - physics of the resonant phenomena in the gas lasers, and several new methodics in the framework of this branch have been proposed and realised. One of them is intracavity frequency-modulated spectroscopy with sensitivity limited only by photon noise and with resolution . On the base of the spectroscopy stabilized gas lasers with frequency stability and with relative repeatability have been developed. There also has been realised a method of registration of subsmall displacements with sensitivity up to m. Switching to dynamic chaos in lasers of the visible range has been observed for the first time. Stabilised -lasers pumped by HF discharge and with frequency stability have been built up and certified.
  • A new theory has been developed and stimulated pressure on atoms in the field of modulated laser light has been first observed. This pressure greatly exeeds usual radiation resonant pressure. A conception of the optics of molecular beems has been made up and phenomenon of molecular deflection by resonant light has been first observed.
  • New methods of the laser control of quantum level populations of atoms and molecules have been proposed and experimentally realised. They are based on the using of adiabatic evolution of the system "atom + coherent laser field".
  • Magnetooptical coherent population trapping resonances in rubidium atoms excited by optical frequency comb was first observed.

Main results

  • A frequency-modulation technique with the intrinsic naturally buildin frequency scale was proposed and experimentally tested. The single-laser method provided the of measurements of the optical frequency difference in the whole range of laser tuning with an accuracy of 100 kHz, which can be further improved. This method was applied to study iodine hyperfine transitions near 640 nm 127I2 R(25) 8–5. (A. M. Negriyko, V. M. Khodakovskiy, I. V. Matsnev, L. P. Yatsenko).
  • Active laser media with organic dyes in a new polyurethane matrix based on aliphatic diisocyanate and oligomeric ester. The using of aliphatic polyurethanes instead of polyurethane acrylate compositions extends the fuctional spectral region and increases the lifetime of laser elements by more than an order of magnitude (V. Bezrodnyi).
  • The stimulated light force on atoms and molecules was first proposed in the late of 1980’s and experimentally observed using a pair of counterpropagating two-color laser beams acting on sodium atom and molecules. The fundamental limitation on the magnitude of optical force has been overcome due to stimulated processes involved in action of light on atomic particles (Voitsekhovich, V. S., Danileiko, M. V., Negriiko, A. M., Romanenko, V. I., Yatsenko, L. P.).

  • В.И. Безродный, Н.А. Деревянко, А.А. Ищенко, А.В. Кропачев. Высокоэффективные пассивные модуляторы добротности для неодимового лазера на основе тиопирилотрикарбоцианиновых красителей. // Квантовая электроника. - 2009. Том 39, № 1, с. 79-83.
  • Derzhypolskyi A., Gnatovskyi A., Negriyko A. Associative Image Reconstruction as a Method of Formation and Stabilization of the Energy Distribution in a Laser Beam. // Ukrainian Journal of Physics. – 2009 . - Vol.54, N 1-2, p.22-27.
  • V. Bezrodny, V.Yashchuk, O. Prygodiuk, V. Koreniuk. Random lasing in porous scattering medium. // Appl. Phys. B. – 2008 - V.92, N 4.
  • Malitskiy R.A., Pardalos P.M., Negriyko A.M., Khodakovskiy V.M., Ismaili K.M., Cheremnykh O.K., Udovitskaya E.G., Yatsenko V.A., Yatsenko L.P. Kozorez V.V., Cryogenic-Optical Sensor for High-Sensitive Gravitational Measurements. // Journal of Automation and Information Sciences – 2006. - Volume 38, 54-68.
  • V. I. Bezrodny , T. N. Smirnova, O. V. Sakhno, J. Stumpe., Nonlinear diffraction in gratings based on polymer–dispersed TiO2 nanoparticles. // Appl. Phys. B. – 2005 - V. 80, N 8.
  • Sergiy M Baschenko. Remote optical detection of alpha particle sources. // J. Radiol. Prot. – 2004. – Vol. 24. – p. 75-82.
  • V.Bezrodnyi, V.Yashchuk, O.Prygodjuk, E.Tikhonov. Multiple scattering effect on luminescence of the dyed polymer matrix. // Quantum Electronics & Optoelectronics. – 2004. - V.7, №1, Р.77-81.
  • А.М. Негрійко, К.Ю. Дмитрієв. Світловий тиск на вільні мікро- та наночастки: утримання та маніпулювання. // Наукові записки. Києво-Могилянська академія. - 2003. - Т. 21. - С.67-73.
  • A.M. Negriyko, O.V. Boyko, N.M. Kachalova, V.M. Khodakovskiy, O.I. Klochko. Design and testing of iodine cells for metrological laser application. // Фізика напівпровідників, квантова та оптоелектроніка. // - 2003. - vol.16. N3. - p.370-377..
  • 10. А.М. Негрийко, А.В.Бойко, Н.М.Качалова, В.М.Ходаковский. О влиянии примеси на частоту излучения стабилизированного лазера. // Квантовая электроника. - 2004. - N 34 - С.482.
  • N. Pojedinok, A. Buchalo, A. Gryganski, A. Negriyko, J. Potemkina. Influence of Low intensity Laser radiation on the Growth and Development of Hericium Erinaceus and Pleurotus Ostereatus. // International Journal of Medicinal Mushrooms (IJMM). - 2001. -N3. -p.199
  • Nonlinear laser spectroscopy of atoms and molecules in sationare ans pulsed laser fields (NAS Ukraine project, state registration No. 0112U002607).
  • Optical, electro physical, magneto transport properties of atom and molecular systems and solid materials with various types of electrical conductivity and structural organization (purpose-oriented program NAS Ukraine, state registration No. 0112U001716).
  • Luminescence of 3D photonic crystals at optical and electrical excitation Luminescence of three-dimensional photonic crustals at optical and electrical excitation (Joint Ukrainian-Rusian project of State Fund for Basic Research Russia and NAS Ukraine РФФД/4-11-24)
  • Mini- and microchip lasers with polymer and crystal Q-switch: time and spectral control (Ukraine-Belorussian project of State Fund for Fundamental Research Ukraine Ф29.1/021F)
  • Influence of Ionizing Radiation on Diode pumped Solid State Laser: investigation and minimum risk applications (STCU project #3128)
  • Development of new atomic clocks using coherent population trapping resonances excited by an optical frequency comb (INTAS Research Project for Space Technologies with CNES and NSAU # 06-1000024-9075)