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1.
Passive Q-switching of a laser-diode-pumped intracavity-frequency-doubling Nd:NYW/KTP laser has been realized with GaAs semiconductor saturable absorber. The dependence of pulse repetition rate, pulse energy, and pulse width on incident pump power are measured. The coupled rate equations are used to simulate the Q-switched process of laser, and the numerical solutions agree with the experimental results.  相似文献
2.
A simple method to determine the thermal focal length of LD end-pumped solid-state laser with stable resonator is presented. The M2 factor describing the quality of the beam can be obtained by scanning a slit through the multi-mode Gaussian beam field. The waist width of the beam and the corresponding TEM00 under the same parameters of laser are then deduced through the law of multi-mode Gaussian beam propagation. Based on the standard matrix theory of stable resonator, the thermal focal length of the gain medium can be easily achieved. To show the application of this approach, the thermal focal length of an LD pumped Nd:YVO4 laser is measured and the experimental results are in agreement with the theoretical prediction.  相似文献
3.
Nd3+ : Ca4GdO(BO3)3, known as Nd : GdCOB, is a new self-frequency doubling laser crystal. Using Cr4+ : YAG as passive Q-switch, we have realized the Q-switched laser running at 0.53 μm with an Nd : GdCOB crystal. Meanwhile, the pulse width, the single pulse energy and the repetition rate under different small-signal transmission of Cr4+ : YAG and different pump conditions are measured and the numerical solutions of the coupling wave rate equations agree with the experimental results.  相似文献
4.
Beam quality factor (M2) and far-field scattering angle of LD end-pump Nd : YVO4 laser were measured by slit-scanning method. The experimental results showed that the laser operated on a multi-mode state. The corresponding analytical treatments for slit-scanning method and M2 factor measurement also were presented in this paper.  相似文献
5.
Nd:Sr5(PO4)3F, known as Nd:S-FAP, is a new material for efficient and miniature diode-laser pumped solid-state lasers. By using a laser-diode pump operating at 805.4 nm, Nd:S-FAP has been successfully lased at 1.328 μm. A slope efficiency of 33.5% and a laser threshold of 18.5 mW have been measured. The theoretical formulas for threshold power and slope efficiency were given and the theoretical estimation agreed with the experimental result.  相似文献
6.
考虑LD泵浦光强和腔内振荡光强的空间高斯分布以及晶体热效应的影响,给出了$山东大学信息科学与工程学院!山东济南250100晶体GaAs被动调Q 1. 06μm激光的耦合速率方程组,数值求解该方程组获得了输出激光的平均输出功率、脉冲宽度、重复率随泵浦功率的变化特性,所得理论值与实验结果相符.  相似文献
7.
A diode-pumped actively Q-switched Nd:GdVO4 green laser with periodically poled KTP (PPKTP) and Acoustic-optic (AO) modulator has been realized. The dependences of pulse energy, pulse width, and peak power on incident pump power are measured. At the pump power of 4.1 W and repetition rate of 10 kHZ, we can obtain a 19.2 ns pulse with pulse energy of 0.11 mJ and peak power of 5.8 kW, which are almost three times of that in the conventional KTP green laser, respectively. A rate equation model is introduced to theoretically analyze the results obtained in the experiment, in which the Gaussian spatial distribution of the intracavity photon density is taken into account. The numerical solutions of the rate equations agree with the experimental results.  相似文献
8.
The intracavity photon density and the initial population-inversion density in the diode-pumped passively Q-switched lasers are assumed to be Gaussian spatial distributions. The space-dependent rate equations are solved numerically. The key parameters of an optimally coupled passively Q-switched laser under Gaussian approximation are determined, and a group of general curves are generated for the first time. These key parameters include the optimal normalized coupling parameter and the optimal normalized saturable absorber parameter that maximize the output energy, and the corresponding normalized energy, normalized peak power, and normalized pulse width. The curves clearly show the dependence of the optimal key parameters on the parameters of the gain medium, the saturable absorber, and the resonator. In addition, the importance including the space variation is also shown. The optimal calculations for a diode-pumped passively Nd: YVO4 laser are presented to demonstrate the use of the curves and the related formulas.  相似文献
9.
By taking into account turnoff time of the slowly active Q-switch, the coupled equations of a slowly actively Q-switched laser are given. These rate equations are solved numerically. The key parameters of an optimally coupled actively Q-switched laser with the turnoff time are determined, and a group of general curves are generated for the first time. These key parameters include the optimal normalized coupling parameter which maximizes the output energy, and the corresponding normalized energy, normalized peak power and normalized pulse width. The curves clearly show the dependence of the optimal key parameters on the parameters of the gain medium and the resonator. In addition, the importance of including turnoff time of the slowly active Q-switch is also shown. The optimal calculations for an actively Q-switched Nd:YVO4 laser with acoustic–optic modulator are presented to demonstrate the use of the curves and the related formulas.  相似文献
10.
A simple method to measure the thermal focal length of solid-state laser with rate equation was presented. By measuring the output beam power of lasers, the beam waist of oscillating wave can be deduced from rate equation under the stable oscillation condition. Based on the ABCD matrix theory, the thermal focus of the gain medium was easily obtained. The thermal focus of a LD end-pumped Nd:GdVO4 laser was measured and the experimental results agreed with the theoretical predication.  相似文献
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