Browsing by Author "Yumashev, K."

Now showing items 1-12 of 12

    • Anisotropy of thermo-optical coefficients of alexandrite laser crystal 

      Loiko, P.; Ghanbari, S.; Matrosov, V.; Yumashev, K.; Major, A. (БНТУ, 2018)
      Anisotropy of thermo-optical coefficients of alexandrite laser crystal / P. Loiko [и др.] // Приборостроение-2018 : материалы 11-й Международной научно-технической конференции, 14-16 ноября 2018 года, Минск, Республика Беларусь / редкол.: О. К. Гусев (председатель) [и др.]. – Минск : БНТУ, 2018. – С. 404-406.
      2019-05-02

    • Continuous-wave microchip laser operation of YB-doped gallium garnets 

      Serres, J. M.; Jambunathan, V.; Loiko, P.; Mateos, X.; Yu, H.; Zhang, H.; Liu, J.; Lucianetti, A.; Mocek, T.; Yumashev, K.; Griebner, U.; Petrov, V.; Aguilo, M.; Diaz, F. (БНТУ, 2018)
      Continuous-wave microchip laser operation of YB-doped gallium garnets / J. M. Serres [и др.] // Приборостроение-2018 : материалы 11-й Международной научно-технической конференции, 14-16 ноября 2018 года, Минск, Республика Беларусь / редкол.: О. К. Гусев (председатель) [и др.]. – Минск : БНТУ, 2018. – С. 412-414.
      2019-05-03

    • Graphene Q-Switched Compact Yb: YAG Laser 

      Serres, J. M.; Jambunathan, V.; Mateos, X.; Loiko, P.; Lucianetti, A.; Mocek, T.; Yumashev, K.; Petrov, V.; Griebner, U.; Aguilo, M.; Diaz, F. (2015)
      We describe a compact Yb: YAG laser Q-switched by a graphene-based saturable absorber and pumped by a laser diode at 932 or 969 nm. The compact laser generates a maximum average output power value of 185 mW at 1032 nm with a slope efficiency value of 12%. The shortest duration of the Q-switched pulse achieved is 228 ns at a repetition frequency of 285 kHz. The maximum pulse energy ...
      2018-03-06

    • Microchip laser operation of Tm,Ho:KLu(WO4)2 crystal 

      Loiko, P.; Serres, J. M.; Mateos, X.; Yumashev, K.; Kuleshov, N.; Petrov, V.; Griebner, U.; Aguilo, M.; Diaz, F. (2014)
      A microchip laser is realized on the basis of a monoclinic Tm,Ho-codoped KLu(WO4)2 crystal cut for light propagation along the Ng optical indicatrix axis. This crystal cut provides positive thermal lens with extremely weak astigmatism, S/M = 4%. High sensitivity factors, M = dD/dPabs, of 24.9 and 24.1 m−1/W for the mg- and pg- tangential planes are calculated with respect to the ...
      2017-11-15

    • Non-linear optical properties of transparent glass-ceramics based on Co2+:Zn(Al,Ga)2O4 spinel nanocrystals 

      Glazunov, I.; Malyarevich, A.; Yumashev, K.; Dymshits, O.; Alekseeva, I.; Zhilin, A. (БНТУ, 2021)
      Transparent glass-ceramics containing Co2+:Zn(Al,Ga)2O4 spinel nanocrystals with sizes of 6–11 nm were studied. Absorption band of the Co2+ ions in the material is shifted to longer wavelengths as compared with glass-ceramics with no Ga2O3 addition. Absorption saturation at 1.54 μm was observed. The developed glassceramics is promising as saturable absorbers for 1.6 μm erbium lasers.
      2022-02-02

    • Optical properties of spinel based glass-ceramics of the Zno-Al2O3-Ga2O3-SiO2 system doped with Co2+ ions 

      Malyarevich, A.; Yumashev, K.; Dymshits, O.; Alekseeva, I.; Zhilin, A. (БНТУ, 2022)
      Transparent glass-ceramics containing Co2+:Zn(Al,Ga)2O4 spinel nanocrystals with sizes of 6–11 nm were studied. Absorption band of the Co2+ ions in the material is shifted to longer wavelengths as compared with glass-ceramics with no Ga2O3 addition. Absorption saturation at 1.54 μm was observed and its characteristics (absorption recovery time, ground-state and excited-state ...
      2022-12-28

    • Thermal expansion of KYbXY1-X(WO4)2 crystals 

      Yumashev, K.; Trusova, E.; Guretskii, S.; Karpinsky, D.; Trukhanova, K.; Kuleshov, N.; Malyarevich, A. (БНТУ, 2022)
      Average and differential linear thermal expansion coefficients of KYbxY1-x(WO4)2 crystals are determined in the directions of the optical indicatrix axes Np, Nm and Ng using dilatometric technique. Dependence of the average and differential linear thermal expansion coefficients on the temperature in the range of 75–290 C and ytterbium contains x from 0 to 1.0 are discussed.
      2022-12-28

    • Thermal Lensing and Multiwatt Microchip Laser Operation of Yb:YCOB Crystals 

      Loiko, P.; Serres, J. M.; Mateos, X.; Yu, H.; Zhang, H.; Liu, J.; Yumashev, K.; Griebner, U.; Petrov, V.; Aguilo, M.; Diaz, F. (2016)
      Thermal lensing is studied in monoclinic Yb:Ca4YO(BO3)(3) (Yb:YCOB) oxoborate crystals cut along the optical indicatrix axes. For all orientations, the thermal lens is positive. In the Z-cut crystal, the sensitivity factors of the thermal lens are MZ-X = 2.4 and MZ-Y = 2.8 m(-1)/W (for E parallel to X), and the astigmatism degree is as low as S/M = 14%. The positive thermal lens ...
      2018-03-18

    • Thermal lensing properties of Alexandrite laser crystal 

      Loiko, P.; Ghanbari, S.; Matrosov, V.; Yumashev, K.; Major, A. (БНТУ, 2019)
      Thermal lensing properties of Alexandrite laser crystal / P. Loiko [и др.] // Приборостроение-2019 : материалы 12-й Международной научно-технической конференции, 13–15 ноября 2019 года, Минск, Республика Беларусь / редкол.: О. К. Гусев (председатель) [и др.]. – Минск : БНТУ, 2019. – С. 441-443.
      2020-01-03

    • Thermo-optic coefficients of monoclinic Er3+:(GdY)2SiO5 crystal 

      Yumashev, K.; Malyarevich, A.; Hertsova, A.; Goman, V.; Pavlovski, L. (БНТУ, 2022)
      Thermo-optic coefficients of the Er3+-doped gadolinium-yttrium oxyorthosilicate crystal Er3+:GdYSO are determined at a wavelength of 632.8 nm for light polarizations E // Np, Nm and Ng. Linear thermal expansion coefficients are estimated for this crystal in the directions of the optical indicatrix axes Nm and Ng.
      2022-12-28

    • Thermo-optic properties of orthorhombic BeAl6O10 crystal 

      Yumashev, K.; Malyarevich, A.; Vilejshikova, E.; Goman, V.; Pavlovski, L. (БНТУ, 2021)
      Thermo-optic coefficients dn/dT were determined for orthorhombic BeAl6O10 crystal for light polarizations E || Np, Nm and Ng in the wavelength range of 0.4–1.1 m. Thermo-optic dispersion formulas for principal thermo-optic coefficients of BeAl6O10 are presented for this spectral range. The principal dn/dT are positive and show a polarization-anisotropy: dnp/dT = 6.4, dnm/dT = ...
      2022-02-02

    • Tm:KLu(WO4)2 microchip laser Q-switched by a graphene-based saturable absorber 

      Serres, J. M.; Loiko, P.; Mateos, X.; Yumashev, K.; Griebner, K. U.; Petrov, V.; Aguilo, M.; Diaz, F. (2015)
      We report on the first Tm-doped double tungstate microchip laser Q-switched with graphene using a Tm:KLu(WO4)2 crystal cut along the Ng dielectric axis. This laser generates a maximum average output power of 310 mW with a slope efficiency of 13%. At a repetition rate of 190 kHz the shortest pulses with 285 ns duration and 1.6 μJ energy are achieved.
      2017-11-18