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排序方式: 共有104条查询结果,搜索用时 468 毫秒
61.
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63.
S. A. Abrosimov A. P. Bazhulin A. P. Bolshakov V. I. Konov I. K. Krasyuk P. P. Pashinin V. G. Ralchenko A. Yu. Semenov D. N. Sovyk I. A. Stuchebryukhov V. E. Fortov K. V. Khishchenko A. A. Khomich 《Doklady Physics》2014,59(7):309-312
Results of the experimental investigation of the spallation phenomenon in polycrystalline and single-crystal synthetic diamond are presented. The shock-wave action on the target was formed by a laser pulse with a duration of 70 ps using a Kamerton-T installation. To attain the ablation pressure of 0.66 TPa on the face surface of the target, the laser radiation of the Nd:glass laser (second harmonics λ = 527 nm, the pulse energy is 2.5 J) was used at intensity up to 2 × 1013 W/cm2. The attained maximal spall strength of diamond σ* ~ 16.5 GPa is 24% of the theoretical ultimate strength. The Raman scattering indicates that a small amount of crystalline diamond is graphitized in the spall region on the back target side. 相似文献
64.
An analysis of the torsional spectrum of monodeuterated methanol CH(2)DOH is presented. Twenty nine torsional subbands have been assigned in the 20-800 cm(-1) region. The newly assigned subbands and those already available in the literature were analyzed with a theoretical approach accounting for internal rotation of an asymmetrical CH(2)D methyl group. Seventy six subband centers were reproduced with an rms value of 0.09 cm(-1). Spectroscopic parameters corresponding to the generalized inertia tensor and to the hindering potential were determined as well as rotation-torsion distortion constants. 相似文献
65.
We report the first experimental observation of a nonlinear laser effect, stimulated Raman scattering (SRS), in manmade diamond grown from the gaseous phase by the chemical vapor deposition (CVD) technique. Multiple Stokes and anti-Stokes generation in the visible and near-IR ranges was excited under nanosecond and picosecond pumping in a 350-μ-thick plate. All the registered Raman-induced lasing wavelengths were identified. We classify the CVD-diamond as a promising χ(3)-active material for Raman laser converters in a record wide spectral range. 相似文献
66.
A. N. Grigorenko P. I. Nikitin V. I. Konov A. M. Ghorbanzadeh M.-L. Degiorgi A. Perrone A. Zocco 《JETP Letters》1998,67(9):723-726
Experimental evidence for ferromagnetic behavior of liquid droplets produced by laser ablation from amorphous alloys is presented
for the first time. Thin films of amorphous magnetic materials are fabricated by a laser deposition technique in the presence
and in the absence of magnetic field. The differences in the parameters of deposited films are attributed to the ferromagnetic
properties of small liquid droplets.
Pis’ma Zh. éksp. Teor. Fiz. 67, No. 9, 686–689 (10 May 1998)
Published in English in the original Russian journal. Edited by Steve Torstveit. 相似文献
67.
68.
Sovyk D. N. Shershulin V. A. Ralchenko V. G. Khomich A. A. Komlenok M. S. Vorobyov V. V. Vlasov I. I. Akimov A. V. Pereverzev V. G. Konov V. I. 《Bulletin of the Lebedev Physics Institute》2015,42(2):63-66
Bulletin of the Lebedev Physics Institute - The method of epitaxial growth of localized photoluminescence sources in the form of the ordered microcolumn diamond structures with silicon-vacancy... 相似文献
69.
S.V. Terekhov E.D. Obraztsova A.S. Lobach V.I. Konov 《Applied Physics A: Materials Science & Processing》2002,74(3):393-396
A new method of a carbon nanotube purity estimation has been developed on the basis of Raman spectroscopy. The spectra of
carbon soot containing different amounts of nanotubes were registered under heating from a probing laser beam with a step-by-step
increased power density. The material temperature in the laser spot was estimated from a position of the tangential Raman
mode demonstrating a linear thermal shift (-0.012 cm-1/K) from the position 1592 cm-1 (at room temperature). The rate of the material temperature rise versus the laser power density (determining the slope of
a corresponding graph) appeared to correlate strongly with the nanotube content in the soot. The influence of the experimental
conditions on the slope value has been excluded via a simultaneous measurement of a reference sample with a high nanotube
content (95 vol. %). After the calibration (done by a comparison of the Raman and the transmission electron microscopy data
for the nanotube percentage in the same samples) the Raman-based method is able to provide a quantitative purity estimation
for any nanotube-containing material.
Received: 11 December 2001 / Accepted: 12 December 2001 / Published online: 4 March 2002 相似文献
70.
Solodyankin MA Obraztsova ED Lobach AS Chernov AI Tausenev AV Konov VI Dianov EM 《Optics letters》2008,33(12):1336-1338
We report a ring-cavity thulium fiber laser mode locked with a single-wall carbon nanotube absorber used in transmission. A carboxymethyl cellulose polymer film with incorporated carbon nanotubes synthesized by the arc discharge method has an absorption coinciding with in the amplification bandwidth of a Tm-doped fiber. This laser is pumped by an erbium fiber laser at 1.57 microm wavelength and produces a 37 MHz train of mode-locked 1.32 ps pulses at 1.93 microm wavelength with an average output power of 3.4 mW. 相似文献