N. V. Kuleshov
Belarusian National Technical University
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Publication
Featured researches published by N. V. Kuleshov.
Optics Letters | 1997
N. V. Kuleshov; A.A. Lagatsky; A. V. Podlipensky; V. P. Mikhailov; G. Huber
Spectroscopic properties and laser performance of Y b-doped tungstates at pulsed Ti:sapphire laser pumping are reported. Room-temperature lasing near 1025nm is demonstrated in Yb:KY(WO(4))(2) and Yb:KGd(WO(4))(2), with a slope efficiency as great as 86.9%.
Optics Letters | 2002
F. Brunner; Thomas Südmeyer; E. Innerhofer; F. Morier-Genoud; Rüdiger Paschotta; V. E. Kisel; V. G. Shcherbitsky; N. V. Kuleshov; J. Gao; K. Contag; A. Giesen; Ursula Keller
We demonstrate what is to our knowledge the first passively mode-locked thin-disk Yb:KY(WO(4))(2) laser. The laser produces pulses of 240-fs duration with an average power of 22 W at a center wavelength of 1028 nm. At a pulse repetition rate of 25 MHz, the pulse energy is 0.9microJ , and the peak power is as high as 3.3 MW. The beam quality is very close to the diffraction limit, with M(2)=1.1 .
Optics Letters | 2005
A.A. Lagatsky; A.R. Sarmani; C.T.A. Brown; W. Sibbett; V. E. Kisel; A. G. Selivanov; I. A. Denisov; A. E. Troshin; K. V. Yumashev; N. V. Kuleshov; V. N. Matrosov; T. A. Matrosova; M. I. Kupchenko
We report the first demonstration, to our knowledge, of soft-aperture Kerr-lens mode locking in a diode-pumped femtosecond Yb3+:YVO4 laser. Near-transform-limited pulses as short as 61 fs are generated around a center wavelength of 1050 nm with an output power of 54 mW and a pulse repetition frequency of 104.5 MHz. This is, to our knowledge, the shortest pulse generated directly from an Yb laser having a crystalline host material. The femtosecond operation has a mode-locking threshold at an absorbed pump power of 190 mW. The nonlinear refractive indexes of the Yb3+:YVO4 crystal have been measured to be 19 x 10(-16) cm2/W and 15 x 10(-16) cm2/W for the sigma and pi polarizations, respectively, at 1080 nm.
Optics Letters | 2004
V. E. Kisel; A. E. Troshin; N. A. Tolstik; V. G. Shcherbitsky; N. V. Kuleshov; V. N. Matrosov; T. A. Matrosova; M. I. Kupchenko
The growth, spectroscopic properties, and laser performance of Yb:YVO4 crystal with laser diode pumping are reported. A peak absorption cross section of 7.4 x 10(-20) cm2 at 985 nm, a radiative lifetime of 0.25 ms, and a stimulated-emission cross section of 1.25 x 10(-20) cm2 at 1008 nm for pi polarization were determined for the Yb3+ ions in YVO4. Continuous-wave laser action of Yb:YVO4 at 1020-1027 nm was demonstrated with an output power of 610 mW and a slope efficiency of 49%.
Optics Communications | 1999
A.A. Lagatsky; N. V. Kuleshov; V. P. Mikhailov
Abstract Room temperature CW laser action of Yb 3+ -doped KY(WO 4 ) 2 and KGd(WO 4 ) 2 crystals at 1026–1044 nm has been demonstrated under pumping by 980 nm fiber-coupled InGaAs laser diode. A slope efficiency of Yb lasers up to 53% has been obtained.
Optics Letters | 2000
A.A. Lagatsky; Amin Abdolvand; N. V. Kuleshov
We report on the laser performance of a diode-pumped Yb:KGd(WO(4))(2) laser that is passively Q switched with a Cr(4+):YAG saturable absorber. Raman conversion of fundamental laser emission in the laser crystal was demonstrated. Q-switched 3.4-mu;J pulses with a pulse width of 85 ns were obtained at the 1033-nm fundamental wavelength and 0.4-mu;J pulses with a pulse width of 20 ns were produced in a first Stokes at 1139 nm.
Optics Express | 2009
F. M. Bain; A.A. Lagatsky; Robert R. Thomson; Nicholas D. Psaila; N. V. Kuleshov; Ajoy K. Kar; W. Sibbett; C.T.A. Brown
We demonstrate laser action in diode-pumped microchip monolithic cavity channel waveguides of Yb:KGd(WO(4))(2) and Yb:KY(WO(4))(2) that were fabricated by ultrafast laser writing. The maximum output power achieved was 18.6 mW with a threshold of approximately 100 mW from an Yb:KGd(WO(4))(2) waveguide laser operating at 1023 nm. The propagation losses for this waveguide structure were measured to be 1.9 dBcm(-1).
Optics Letters | 2007
N. A. Tolstik; Sergey V. Kurilchik; Victor E. Kisel; N. V. Kuleshov; Victor V. Maltsev; O.V. Pilipenko; E. V. Koporulina; N. I. Leonyuk
We report the spectroscopy and high-power continuous-wave (CW) diode-pumped laser operation of Er:Yb:YAl3(BO3) crystal. Absorption and stimulated emission spectra, emission lifetimes, and efficiency of energy transfer from Yb3+ to Er3+ ions were determined. A CW Er:Yb:YAB laser emitting at 1602, 1555, and 1531 nm with output power as high as 1W and slope efficiency up to 35% was demonstrated.
Optics Letters | 2005
V. E. Kisel; A. E. Troshin; V. G. Shcherbitsky; N. V. Kuleshov; V. N. Matrosov; T. A. Matrosova; M. I. Kupchenko; F. Brunner; Rüdiger Paschotta; F. Morier-Genoud; Ursula Keller
A diode-pumped Yb:YVO4 laser has been passively mode locked for the first time, to our knowledge. 120 fs pulses with an average output power of 300 mW and a peak power as high as 14.5 kW are obtained by use of a semiconductor saturable-absorber mirror for passive mode locking. The optical spectrum has a 10 nm bandwidth (full width at half-maximum) and is centered at 1021 nm.
Optics Letters | 1992
M. I. Demchuk; V. P. Mikhailov; N.I. Zhavoronkov; N. V. Kuleshov; P. V. Prokoshin; K. V. Yumashev; M. G. Livshits; B. I. Minkov
Saturation of near-infrared absorption in Mg(2)SiO(4):Cr is observed, and the absorption cross section at 1.08 microm is estimated to be sigma(alpha) = (2.3 +/- 0.3) x 10(-18) cm(2). Q switching and passive mode locking of a Nd:YAG laser have been realized with a Mg(2)SiO(4):Cr saturable absorber.
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