Papers by Sergei Sverchkov
Journal of Non-Crystalline Solids
Optics Letters, 2021
The first, to the best of our knowledge, mid-infrared Q-switched Ce3+-doped glass laser is demons... more The first, to the best of our knowledge, mid-infrared Q-switched Ce3+-doped glass laser is demonstrated. As saturable absorbers, Fe2+:CdSe and Fe2+:CdTe are used for the first time. When Q-switched by Fe:CdSe, the laser operates in a multi-pulse regime with an individual pulse width of 110 ns, centered at λ = 5.20 µm. With Fe:CdTe as saturable absorber, 1–3 giant pulses of 30 ns pulse width are generated at λ = 5.13 µm.
Advanced Solid-State Lasers Congress, 2013
ABSTRACT Fabrication and laser tests of a composite optical fiber with phosphate glass core in a ... more ABSTRACT Fabrication and laser tests of a composite optical fiber with phosphate glass core in a silica cladding are described. Laser action was demonstrated both with core and cladding pumping by ytterbium fiber laser and by laser diode respectively.
Optics Communications, 2007
Energy transfer and spectroscopic properties at high temperatures have been investigated in Er,Yb... more Energy transfer and spectroscopic properties at high temperatures have been investigated in Er,Yb:YAG crystals. It is shown that at elevated temperatures around 600-800°C these characteristics become similar to those in the efficient 1.5 lm laser medium-Er,Ybdoped phosphate glasses.
Chinese Physics Letters, 2006
ABSTRACT A laser-diode-pumped 1.54-μm passive Q-switched erbium doped glass laser was reported. W... more ABSTRACT A laser-diode-pumped 1.54-μm passive Q-switched erbium doped glass laser was reported. We utilize a laser diode with wavelength of 973 nm to pump a 1-mm Er/Yb co-doped phosphate glass with the erbium and ytterbium concentrations of 1 wt.% and 21 wt.%, respectively. A Co2+:MgAl2O4 slab crystal was used as a passive Q-switcher. Q-switched pulses with repetition frequency of 800 Hz, width of 7.4 ns, peak power of 2.2 kW and average power of 13.3 mW were obtained when absorbed pump power was 475 mW. A sandwich structure of the Q-switched microchip Er/Yb glass laser was demonstrated, which shows shorter pulse width of 6.8 ns. Dependences of pulse duration and repetition frequency on pump power were also investigated.
Optics & Laser Technology
Optical Materials Express
The influence of rare earth dopant concentration on selenide laser glass quality was investigated... more The influence of rare earth dopant concentration on selenide laser glass quality was investigated. A problem to be solved was identified – an increase in rare earth doping level leads to optical losses due to light scattering by heterogeneous inclusions and to the decrease of the optical damage threshold. The room temperature laser system consisting of 4.6 μm pulsed Fe:ZnSe pump laser and Ce3+:Ge20Sb10Ga5Se65 bulk glass was demonstrated. The slope efficiency of Ce3+:glass laser with respect to the absorbed pump energy reached 25% with a maximum output energy of 45 mJ.
Optics Express, 2021
An extensive study of a novel room-temperature mid-infrared Ce3+-doped Ge20Sb10Ga5Se65 glass lase... more An extensive study of a novel room-temperature mid-infrared Ce3+-doped Ge20Sb10Ga5Se65 glass laser is reported. An influence of output-coupler transmission on laser efficiency and emission spectra is investigated. Pumped by a pulsed Fe:ZnSe laser at 4.1 µm, a maximum output energy of 35 mJ is demonstrated at 5.2 µm, with a laser threshold of about 60 mJ and a slope efficiency of 21%. The tuning range of a mid-infrared Ce:glass laser is reported for the first time: with an intracavity prism, the laser is continuously tunable in the spectral range of 4.5–5.6 µm. The internal losses are determined to be below 9% per roundtrip.
Laser Physics Letters, 2018
This letter demonstrates the passive Q-switching possibility of a 2.3 µm Tm-doped tellurite glass... more This letter demonstrates the passive Q-switching possibility of a 2.3 µm Tm-doped tellurite glass laser with the help of a Fe2+:ZnS saturable absorber. In contrast to Cr2+—doped materials, this saturable absorber is transparent at the laser pump wavelengths (0.69 or 0.8 µm). Pulses as short as 150–200 ns were formed.
Optical and Quantum Electronics, 2016
We report the results of the experiments on the magnetic optical activity in Bi-doped Mg–Al–Si ox... more We report the results of the experiments on the magnetic optical activity in Bi-doped Mg–Al–Si oxide glass in the temperature range of 1.48–200 K and high magnetic fields—up to 6.5 T. Temperature dependences of the magnetic circular polarization of luminescence and magnetic circular dichroism indicate the spin multiplicity of the ground and excited states. The investigated system has at least three different defect centers. Experimental data are explained in the assumption of an even-electron system with axial and rhombic zero-field splitting components.
Advanced Solid-State Photonics, 2004
ABSTRACT A new crystalline medium for 1.5 micron Yb-Er lasers is proposed: GdCa4O(BO3)3 (GdCOB). ... more ABSTRACT A new crystalline medium for 1.5 micron Yb-Er lasers is proposed: GdCa4O(BO3)3 (GdCOB). Its melting point allows crystal growth using Pt instead of Ir crucibles. Spectroscopic and laser tests of the new material are described.
Lasers, Sources, and Related Photonic Devices, 2012
ABSTRACT Properties of Bi-doped “powder-in-tube” fabricated fibers were compared with the bulk gl... more ABSTRACT Properties of Bi-doped “powder-in-tube” fabricated fibers were compared with the bulk glass samples of the same Mg-Al-silicate glass composition. The losses in the fibers were an order of magnitude less than in Ir crucible melted glasses.
Applied Physics B, 2009
A new Bi-doped Mg-Al-silicate glass is suggested and investigated. It can be fabricated by modera... more A new Bi-doped Mg-Al-silicate glass is suggested and investigated. It can be fabricated by moderatetemperature routine technology. The characteristic relaxation time of 300-800 μs in combination with the high quantum yield (up to 85%) and wide excitation spectrum makes this glass a promising laser material. The obtained quadratic dependence of the visible absorption intensity is an argument in favor of the hypothesis that the absorption and infrared luminescence in Bi-doped glasses are caused by Bi 2 dimers.
Applied Optics, 2000
We report on passively Q-switched operation of a diode-pumped Er-Yb:glass laser with a Co(2+):MgA... more We report on passively Q-switched operation of a diode-pumped Er-Yb:glass laser with a Co(2+):MgAl(2)O(4) plate as a saturable absorber. Optical pulses with peak power exceeding 2 kW and a pulse length of 2.3 ns have been generated. Single-longitudinal-mode Q-switched operation at 1.53 mum has been obtained by use of the Co(2+):MgAl(2)O(4) plate as an intracavity etalon. A discussion of the optimal Er(3+) concentration as well as optimization of the cavity design is included.
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Papers by Sergei Sverchkov