The Spectroscopy Laboratory conducts research in the following areas:

• Raman spectroscopy
• UV, visible, and IR spectroscopy
• Measurement of the spectral dependence of the refractive index of solid-state materials
• Laser calorimetry of bulk materials
• Computer modeling of materials

Main research areas:

• Oxide glass-based glasses and light guides
• Tellurite glass and light guides based on them
• Chalcogenide glass and light guides based on them, silicon dioxide, geochemistry

Available equipment: Raman spectrograph T 64000; IR Fourier spectrometer; Bruker Lambda 900; Ar+ Laser Spectra Physics

Collaboration:

• Institute of High-Purity Chemistry of the Russian Academy of Sciences (Nizhny Novgorod) https://ichps.ru/
• Physical Institute of the Russian Academy of Sciences (Moscow) https://lebedev.ru/ru
• Nizhny Novgorod State University (Nizhny Novgorod) http://www.unn.ru
• Giredmet (Moscow) https://giredmet.ru/ru/
• VNIIFTRI https://www.vniiftri.ru/
• Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences (Moscow) http://www.geokhi.ru/
• Russian University of Chemical Technology (Moscow) https://www.muctr.ru/
• Institute of Crystallography, Russian Academy of Sciences (Moscow) http://www.crys.ras.ru

2026

1. V.V. Koltashev, M.V. Sukhanov, V.V. Likhov, B.I. Denker, B.I. Galagan, S.E. Sverchkov, E.N. Lashmanov, A.P. Velmuzhov, V.G. Plotnichenko, A.G. Okhrimchuk, 5-μm Tb3+ doped chalcogenide glass fiber laser with Bragg grating Infrared Physics & Technology, Vol. 155, 106455 (2026)
2. I. S. Glebov, S. S. Fedotov, Yu. V. Mikhailov, A. S. Lipatiev, A. G. Okhrimchuk & V. N. Sigaev, Micromodification of Float Glass Structure by Femtosecond Laser Pulses for Analog Sound Storage Glass and Ceramics Vol. 82, p. 469–472 (2026)

2025

1. Vasily S. Tsarev, Filipp O. Milovich, Andrey D. Pryamikov, Grigory K. Alagashev, and Andrey G. Okhrimchuk, Violation of axial symmetry during micro-modification by a linearly polarized Gaussian beam in the bulk of fused silica in the single ultrashort pulse regime Optics Express Vol. 33, Issue 17, pp. 36586-36596 (2025) •https://doi.org/10.1364/OE.564865
2. Vasily S. Tsarev, Vladimir K. Mezentsev, and Andrey G. Okhrimchuk, "Simple spherical aberration control in the direct laser writing deep under the plane surface of dielectrics," Appl. Opt. 64, 2009-2014 (2025)

• Laser generation over a wide wavelength range of 5–6 μm has been demonstrated for the first time in chalcogenide optical fibers doped with Tb3+, Ce3+, and Nd3+ ions. Laser generation parameters acceptable for practical applications have been achieved: generation at room temperature, power up to 200 mW, pump efficiency up to 6.4%. The longest-wavelength laser (λ~6.01 μm) among all rare-earth-doped glass lasers was created using the 4I11/2–4I9/2 Nd3+ transition. The developed lasers are intended for use in widely sought-after devices for special, medical, analytical, and diagnostic applications, which urgently require efficient and compact (especially fiber-based) sources of coherent mid-IR radiation. At the General Meeting of the Physical Sciences Division of the Russian Academy of Sciences on May 27, 2024, the results obtained were recognized as outstanding achievements in condensed matter physics, laser physics, and the physics of nonlinear phenomena by institutes of the Physical Sciences Division of the Russian Academy of Sciences over the past 25 years.


• A femtosecond laser beam was used to create spirals in the bulk of phosphate glass with a pitch on the order of the wavelength of light in the IR range. These spirals have a lower refractive index than unexposed glass. The created spirals are the cladding of a low-mode waveguide with an embedded Bragg grating. The reflectivity spectrum of the resulting Bragg structures was studied. It was shown that the beam reflected from the Bragg gratings has a helical wavefront and carries orbital angular momentum.


• Research on direct laser writing in quartz glass has revealed that a single ultrashort laser pulse of a tightly focused Gaussian beam creates axially asymmetric voxels. These voxels exhibit birefringence, the slow axis of which lies in the plane of laser beam polarization. Rotating the plane of laser beam polarization results in a corresponding rotation of the birefringence axis. The anisotropic formation of a voxel by a single laser pulse is explained by the vector nature of the electromagnetic field, which manifests itself in the formation of an axially asymmetric waist when focusing with a high numerical aperture. The axial asymmetry arises primarily due to the longitudinal component of the electric field, which has two maxima equidistant from the optical axis in the plane of beam polarization.


• A directional splitter (DS) architecture is proposed. It consists of curved single-mode waveguides with a structured cladding of low refractive index. The DS are written in the bulk of industrial K8 glass using a femtosecond laser beam. The dependence of the proportion of optical power transferred between the DS arms in the telecommunications band on the length of the communication section was experimentally and theoretically studied. The maximum proportion of transferred power was 56%, limited by the asymmetry of the DS arms. The modal propagation loss was 0.8 dB/cm.