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1.
Kisel VE Troshin AE Tolstik NA Shcherbitsky VG Kuleshov NV Matrosov VN Matrosova TA Kupchenko MI 《Optics letters》2004,29(21):2491-2493
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%. 相似文献
2.
240-fs pulses with 22-W average power from a mode-locked thin-disk Yb:KY(WO(4))(2) laser 总被引:3,自引:0,他引:3
Brunner F Südmeyer T Innerhofer E Morier-Genoud F Paschotta R Kisel VE Shcherbitsky VG Kuleshov NV Gao J Contag K Giesen A Keller U 《Optics letters》2002,27(13):1162-1164
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 . 相似文献
3.
V. E. Kisel A. E. Troshin N. A. Tolstik V. G. Shcherbitsky N. V. Kuleshov V. N. Matrosov T. A. Matrosova M. I. Kupchenko 《Applied physics. B, Lasers and optics》2005,80(4-5):471-473
We report the efficient continuous-wave (CW) and Q-switched laser operation of a diode-pumped Yb:YVO4 laser. A CW output power of 1 W with a slope efficiency of 59% with respect to absorbed pump power was demonstrated. Passively Q-switched with a Cr4+:YAG saturable absorber, a Yb:YVO4 laser with Raman conversion was demonstrated. Q-switched 18.7- J pulses with a pulse duration of 17 ns and a peak power up to 1 kW were obtained at 1018-nm fundamental wavelength and 3.6- J pulses with a pulse duration of 6 ns and a peak power of about 0.6 kW were obtained at 1119.5-nm first-Stokes wavelength.This revised version was published online in March 2005. In the previous version, the published online date was missing 相似文献
4.
CW laser performance of Yb and Er,Yb doped tungstates 总被引:2,自引:0,他引:2
N. V. Kuleshov A. A. Lagatsky V. G. Shcherbitsky V. P. Mikhailov E. Heumann T. Jensen A. Diening G. Huber 《Applied physics. B, Lasers and optics》1997,64(4):409-413
Room temperature cw laser action of Yb3+-doped KY(WO4)2 and KGd(WO4)2 crystals at 1.025 μm and Er, Yb : KY(WO4)2 at 1.54 μm has been demonstrated under pumping by both Ti-sapphire laser and InGaAs laser diodes. A slope efficiency of Yb-lasers
up to 78% has been obtained.
Received: 19 June 1996 相似文献
5.
V. É. Kisel’ V. G. Shcherbitsky N. V. Kuleshov V. I. Konstantinov V. I. Levchenko E. Sorokin I. Sorokina 《Optics and Spectroscopy》2005,99(4):663-667
The temperature and concentration quenching of the luminescence of Cr2+ ions in Cr:ZnSe crystals is experimentally investigated and the radiative lifetime of the upper lasing level is determined. The values of the cross sections of absorption from the ground state of Cr2+ ions in Cr:ZnSe crystals are refined. It is shown that the absorption from the excited state of Cr2+ ions is negligible near 1.5 μm. Lasing in Cr:ZnSe single crystals is implemented with an efficiency of 31% and an output power of 186 mW using laser diode pumping at a wavelength of 1.77 μm. 相似文献
6.
V. P. Mikhailov N. I. Zhavoronkov N. V. Kuleshov A. S. Avtukh V. G. Shcherbitsky B. I. Minkov 《Optical and Quantum Electronics》1995,27(9):767-776
The results of absorption saturation measurements in the visible on chromium-doped Y2SiO5, Gd2SiO5 and Mg2SiO4 crystals are reported. The cross-sections for ground state and excited state absorption of Cr4+ ion in distorted tetrahedral sites are estimated at 694 nm. Saturable absorber Q-switching of a ruby laser using Cr-doped Y2SiO5 and Mg2SiO4 is described. 相似文献
7.
Kuleshov NV Podlipensky AV Shcherbitsky VG Lagatsky AA Mikhailov VP 《Optics letters》1998,23(13):1028-1030
The absorption saturation and the laser efficiency of Cr(4+): forsterite were measured with 1064-nm (E || b), 980-nm (E || c), and 780-nm (E || b) pulsed laser pumping. A slope efficiency of 32% was obtained for the 980-nm (E || c) pump wavelength, where the excited-state absorption losses were shown to be negligible. 相似文献
8.
NL Asfandiarov AI Fokin VG Lukin EP Nafikova GS Lomakin VS Fal'ko YV Chizhov 《Rapid communications in mass spectrometry : RCM》1999,13(12):1116-1123
A series of anthraquinone (C(14)O(2)H(8)) derivatives has been studied by means of electron capture negative ion mass spectrometry (ECNI-MS), photoelectron spectroscopy (PES), and AM1 quantum chemical calculations. Mean lifetimes of molecular negative ions M(-.) (MNI) have been measured. The mechanism of long-lived MNI formation in the epithermal energy region of incident electrons has been investigated. A simple model of a molecule (a spherical potential well with the repulsive centrifugal term) has been applied for the analysis of the energy dependence of cross sections at the first stage of the electron capture process. It has been shown that a temporary resonance of MNI at the energy approximately 0.5 eV corresponds to a shape resonance with lifetime 1-2.10(-13) s in the f-partial wave (l = 3) of the incident electron. The next resonant state of MNI at the energy approximately 1.7 eV has been associated with the electron excited Feshbach resonance (whose parent state is a triplet npi* transition). In all cases the initial electron state of the MNI relaxes into the ground state by means of a radiationless transition, and the final state of the MNI is a nuclear excited resonance with a lifetime measurable on the mass spectrometry timescale. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
9.
Podlipensky AV Shcherbitsky VG Kuleshov NV Mikhailov VP Levchenko VI Yakimovich VN 《Optics letters》1999,24(14):960-962
Passive Q switching of Er:glass lasers has been demonstrated with Cr(2+):ZnSe and Co(2+):ZnSe saturable absorbers. A pulse duration of ~50ns and an output pulse energy of 5 mJ were obtained with both Co:ZnSe and Cr:ZnSe passive shutters. A Q-switched conversion efficiency of as much as 26% was obtained for Cr:ZnSe. Theoretical modeling exhibits satisfactory agreement with experimental data. 相似文献
10.
W Wang Z Liu L Ma C Hao S Liu VG Voinov NI Kalinovskaya 《Rapid communications in mass spectrometry : RCM》1999,13(12):1189-1196
Electrospray ionization (ESI) combined with multiple-stage tandem mass spectrometry (MS(n)) was used to directly analyze the glycolipid mixture from bacteria Bacillus pumilus without preliminary separation. Full scan ESI-MS revealed the composition of picomole quantities of glycerolglycolipid species containing C(14)-C(19) fatty acids, some of which were monounsaturated. Two main components were identified from their molecular masses and fragmentation pathways. The fragmentation pathway of the known compound compared with the investigated compound verified the proposed structure as 1(3)-acyl-2-pentadecanoyl-3(1)-O-[beta-D-glucopyranosyl-(1-->6)-O-beta-D-glucopyranosyl]-sn-glycerols. A comparison of the multiple tandem mass spectra of the different alkali-metal cation adducts indicates that the intensity of fragments and the dissociation pathways are dependent on the alkali-metal type. The basic structures of glycerolglycolipids were reflected clearly from the fragmentation patterns of the sodium cations. The intense fragments of the sugar residue from the precursor ions were obtained from the lithiated adduct ions. ESI-MS(n) spectra of [M + K](+) ions did not provide as much fragmentation as [M + Na](+) and [M + Li](+) adducts, but their spectra allow the position of glycerol acylation to be determined. On the basis of MS(2) spectra of [M + K](+) ions, it was established that all components have a C(15:0) fatty acid at the sn-2 position of the glycerol backbone and C(14)-C(19) acids at the sn-1 position of the glycerol backbone. Copyright 1999 John Wiley & Sons, Ltd. 相似文献