Laser Physics

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Influence of pre-heat treatment and different light-curing units on Vickers hardness of a microhybrid composite resin
Laser Physics - Tập 19 - Trang 1276-1281 - 2009
E. G. Saade, M. C. Bandeca, A. N. S. Rastelli, V. S. Bagnato, S. T. Porto-Neto
The aim of this study was to evaluate the hardness of a dental composite resin submitted to temperature changes before photo-activation with two light-curing unite (LCUs). Five samples (4 mm in diameter and 2 mm in thickness) for each group were made with pre-cure temperatures of 37, 54, and 60°C. The samples were photo-activated with a conventional quartz-tungsten-halogen (QTH) and blue LED LCUs ...... hiện toàn bộ
Harmonic generation beyond the Strong-Field Approximation: Phase and temporal description
Laser Physics - - 2010
J. A. Pérez-Hernández, José Luis Martínez Ramos, L. Roso, Luis Plaja
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
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
Laser frequency stabilization for atom cooling and magnetic-field compression of the trap
Laser Physics - Tập 17 - Trang 1176-1182 - 2007
S. Chakrabarti, A. Ray, A. Bandyopadhyay, D. Bhattacharyya, B. Ray, B. N. Jagatap, K. G. Manohar, P. N. Ghosh
We report a frequency stabilization technique of a diode laser in a Doppler-free atomic transition used for obtaining the magneto-optical trapping of Rb atoms. This technique, based on side locking to an atomic transition using a servo controller, is very simple and can be implemented straightforwardly to lock the laser at the red detuned frequency position required for laser cooling experiments. ...... hiện toàn bộ
Capillary discharge soft X-ray lasing in Ne-like Ar pumped by low main current pulses
Laser Physics - Tập 18 - Trang 1526-1529 - 2008
Y. Xie, Y. P. Zhao, M. Z. Mo, T. Liu, Q. Wang
Under the condition of the low main current pulse, the capillary discharge soft X-ray laser is obtained. The laser energy of the same discharge current amplitude at different Ar pressures and of different current amplitudes at the same Ar pressure are compared, respectively. At different Ar pressures, the amplitude of the main current pulse evidently impacts the soft X ray, especially at a pressur...... hiện toàn bộ
Laser gốm Yb:YAG bơm diode với cấu trúc gương chủ động Dịch bởi AI
Laser Physics - Tập 22 - Trang 652-655 - 2012
X. J. Cheng, B. X. Jiang, L. Li, J. L. Wang, Zh. G. Yang, W. B. Cheng, X. Ch. Shi, Y. B. Pan
Bài báo này trình bày về các laser từ gốm Yb:YAG ở các nhiệt độ khác nhau. Laser gốm Yb:YAG với cấu trúc gương chủ động được bơm bằng một diode laser có bước sóng trung tâm là 940 nm. Tại 80 K, với nồng độ pha tạp 5 at % gốm Yb:YAG, năng lượng đầu ra đạt 0,68 J với tần suất lặp lại 10 Hz dưới năng lượng bơm là 2,49 J, tương ứng với hiệu suất độ dốc 40% và hiệu suất chuyển đổi 27,3%.
#laser gốm #Yb:YAG #gương chủ động #năng lượng đầu ra #hiệu suất độ dốc #hiệu suất chuyển đổi
30.6 W CW Tm3+ fiber laser of seed amplification
Laser Physics - Tập 22 - Trang 1606-1609 - 2012
Y. Liu, H. R. Wang, W. H. Li
We use all fiber single-mode lasers as seed source, all fiber amplifiers and pump laser coupling amplifier has been experimentally investigated, respectively. The max output power of all fiber amplifier is 30.6 W, corresponding slope efficiency is 39.1%. The two setups, amplifier output laser spectrum finely holds the property of seed laser spectrum, the wavelength of output laser are both 1947.6 ...... hiện toàn bộ
Optimization of Brillouin pump wavelength location on tunable multiwavelength BEFL
Laser Physics - Tập 19 - Trang 2110-2114 - 2009
Z. Abd Rahman, M. H. Al-Mansoori, S. Hitam, A. F. Abas, M. H. Abu Bakar, M. A. Mahdi
Optimization of Brillouin pump (BP) wavelength location on tunable multiwavelength Brillouin-erbium fiber laser (BEFL) with BP pre-amplified technique is experimentally investigated. The tunable multiwavelength BEFL is achieved by utilization a tunable band-pass filter in a laser cavity. The optimum BP power and BP wavelength location within the filter bandwidth is determined in order to obtain th...... hiện toàn bộ
Cold bosons in optical lattices
Laser Physics - Tập 19 - Trang 1-110 - 2009
V. I. Yukalov
Basic properties of cold Bose atoms in optical lattices are reviewed. The main principles of correct self-consistent description of arbitrary systems with Bose-Einstein condensate are formulated. Theoretical methods for describing regular periodic lattices are presented. A special attention is paid to the discussion of Bose-atom properties in the frame of the boson Hubbard model. Optical lattices ...... hiện toàn bộ
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