Laser Physics

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The Kuramoto-Sivashinsky equation for the defect-deformation instability of a surface-stressed nanolayer
Laser Physics - Tập 19 Số 3 - Trang 538-543 - 2009
V. I. Emel’yanov
Linearly-polarized Tm-doped double-clad fiber laser
Laser Physics - Tập 20 - Trang 1752-1755 - 2010
D. Z. Yang, W. Liu, T. Chen, W. Ye, Y. H. Shen
We report a linearly polarized Tm doped fiber laser. The fiber laser was set up by using a piece of polarization maintaining Tm doped double clad fiber of 5 m length as gain medium and a polarization beam splitter as a polarization selector. The fiber laser was pumped by a fiber pigtailed laser diode working at 790 nm with a maximum output power of 90 W. The linearly polarized Tm laser operated at...... hiện toàn bộ
Third harmonic generation of Nd:glass laser with novel composite deuterated KDP crystals
Laser Physics - Tập 20 - Trang 1923-1926 - 2010
W. Wang, J. Wang, F. Wang, B. Feng, K. Li, H. Jia, W. Han, Y. Xiang, F. Li, L. Wang, W. Zhong, X. Zhang, S. Zhao
A novel composite partially deuterated KDP crystal used for frequency tripling is experimentally demonstrated for the first time in this paper. The deuteration level is used as a degree of freedom to alter the phase matching wavelength so as to increase the bandwidth acceptance. The results show that the acceptance bandwidth based on such crystal can be increased by a factor of 3 comparing with th...... hiện toàn bộ
Optical parameters measurement for diagnostic and photodynamic therapy of human cervical adenocarcinoma (HeLa) cell line
Laser Physics - - 2012
Abdul Rehman, S. Firdous, M. Nawaz, Mushtaq Ahmad
Increasing efficiency of laser fluorescence diagnostics of microbial diseases
Laser Physics - Tập 17 - Trang 1416-1423 - 2007
M. T. Alexandrov, O. G. Gaponenko, M. A. Ivanova, V. A. Khomenko, G. P. Kuzmin, M. V. Makarova, E. P. Pashkov, G. M. Sorokoumova, E. N. Vasiliev
The laser-induced fluorescence spectra of five types of mycobacteria are studied in various associations. The results obtained are used to demonstrate the possibility of a diagnostic system for the differential diagnostics of microbial diseases. The method employed for the specific analysis of microbial species in the substrate that contain various associations is based on a regression of the spec...... hiện toàn bộ
Dressed states analysis of lasing without population inversion in a three-level ladder scheme: Approximate analytic time dependent solutions
Laser Physics - Tập 19 - Trang 290-304 - 2009
D. Braunstein, R. Shuker
A dressed-state study of lasing without population inversion from a three level atom interacting with a bi-chromatic laser field, in the ladder configuration, is formulated. We allow the atomic system to be dressed by both laser filed photons (double dressing). The evolution of the system under consideration is being explored both analytically and numerically, within the transient regime. Time dep...... hiện toàn bộ
Bidirectional-pumped L-band erbium-doped fiber amplifier with pump distribution technique
Laser Physics - Tập 22 - Trang 1252-1256 - 2012
N. Md. Yusoff, A. F. Abas, S. Hitam, M. A. Mahdi
A dual-stage erbium doped fiber amplifier (EDFA) having a flat gain wavelength response throughout L-band transmission window is presented. By applying pump power distribution technique, the pump power is distributed to two different stages with different length of EDF depending on the coupling ratio. By controlling these two parameters, gain of 19.1 dB with small gain variation of less than 0.5 d...... hiện toàn bộ
Diode-pumped Nd:GAGG-LBO laser at 531 nm
Laser Physics - Tập 22 - Trang 485-488 - 2012
J. Zou, H. Chu, L. R. Wang
We report a green laser at 531 nm generation by intracavity frequency doubling of a continuous wave (cw) laser operation of a 1062 nm Nd:GAGG laser under in-band diode pumping at 808 nm. A LiB3O5 (LBO) crystal, cut for critical type I phase matching at room temperature is used for second harmonic generation of the laser. At an incident pump power of 18.5 W, as high as 933 mW of cw output power at ...... hiện toàn bộ
Possibility of lasing on the Ne transitions in the afterglow of a background electron multiplication wave
Laser Physics - Tập 17 - Trang 1-4 - 2007
A. A. Fedenev, S. I. Yakovlenko
The possibility of lasing with the Ne + H2 Penning mixture in the afterglow of a background electron multiplication wave that emerges in the presence of a nanosecond high-voltage pulse with the subnanosecond leading edge across the discharge gap filled with the atmospheric-pressure gas is considered. The needed nonuniformity of the field is created with small-curvature-radius electrodes. It is dem...... hiện toàn bộ
Ablation induced by single-and multiple-femtosecond laser pulses in lithium niobate
Laser Physics - Tập 17 - Trang 1378-1381 - 2007
H. Chen, X. Chen, Y. Zhang, Y. Xia
We present results on the surface-damage threshold of lithium niobate after single-and multiple-femtosecond laser pulse irradiation at the pulse duration of 80 fs, with a 800-nm wavelength, and a repetition rate of 1 kHz. The surface-ablation threshold was found to decrease significantly with an increase in the pulse number applied to the surface until reaching an almost constant level due to an i...... hiện toàn bộ
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