共查询到19条相似文献,搜索用时 515 毫秒
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用时域ABCD矩阵对调Q锁模激光器的研究 总被引:3,自引:3,他引:0
用时域ABCD矩阵讨论了调Q锁模脉冲激光器输出脉冲的宽度和啁啾特性,主要给出了调Q元件作为幅度调制元件时的时域ABCD矩阵,并将光脉冲在激光腔中往返一周的ABCD矩阵写出,用此矩阵讨论了它对锁模脉冲的影响.给出了Nd:YAG激光器中用Cr4+:YAG作调Q元件时的调Q锁模脉冲激光器特性,并讨论了腔内色散、饱和吸收强度、增益带宽对输出脉冲特性的影响.用时域ABCD矩阵大大简化了计算过程. 相似文献
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本文从理论出发,分析抗共振环(Anti-ResonantRing-ARR)稳定调Q 激光脉冲的作用.将新型调Q晶体Cr4+:YAG置于ARR中心,在平-ARR介稳腔中获得能量起伏0.34%的高稳调Q单脉冲输出. 相似文献
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全光纤调Q掺铒光纤激光器的脉冲研究 总被引:5,自引:3,他引:2
报道一种全光纤调Q掺铒光纤激光器,在其结构中采用带有光纤光栅的光纤环形镜作为调Q装置此调Q方案同时具有对腔内损耗进行调制和对激光输出波长选择的功能理论上分析了不同臂长差时的脉冲出现情况,与实验基本相符并对激光单脉冲产生及稳定性进行了分析讨论. 相似文献
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针对单光子源对高性能纳米腔的需要, 采用“柔性束缚"光子限制结构和时域有限差分法, 通过把时域和频域的光电场分布与理想高斯函数进行比较, 设计出一种高品质因子的光子晶体缺三腔(L3), 其Q值达Q=2.8×105, 有效模式体积为Veff=0.1813(λ/n)3, 相应的Purcell因子超过F=1.2×105. 此外, 提出一种定量描述腔性能优劣程度的能量系数分析法, 通过定量对比二维高斯分布下的场分布能量与总能量, 提高了腔的优化速度与准确性. 计算结果表明, 随着腔性能的优化, Q值正比于能量系数γ值直至饱和. 相似文献
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The effect of thermal photons on the radiative properties of a one-atom maser is investigated. Stationary Pand Qdistribution functions are determined analytically in the approximation of strong interaction between an atom and a cavity field mode. The generation conditions are found for a one-atom maser. It is shown that taking into account thermal photons leads to a decrease in the threshold value of incoherent pumping. It is demonstrated that generation may occur in the absence of population inversion in the atomic subsystem and when losses exceed the intensity of incoherent pumping. A formula is proposed for the Fano factor of a one-atom maser in the form of the sum of the Fano factors of the microcavity radiation in the absence of thermal photons and the thermal radiation. 相似文献
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Harro G. Andresen 《Zeitschrift für Physik A Hadrons and Nuclei》1969,223(1):71-102
The conventional atomic beam preparation technique for hydrogen maser operation consists of a six pole magnetic field focussing in combination with adiabatically changing magnetic fields in the transition region between focusser and maser cavity, which results in a state selected, polarized ensemble of hydrogen atoms. Hydrogen maser operation with state selected, but unpolarized atoms has the advantage to reduce considerably the sensitivity of hydrogen maser frequency on coherently excited, low frequency,Δm F =±1 Zeeman transitions. The influence of the magnetic field pattern in the transition region on the energy level population probabilities for the focussed hydrogen beam has been analysed. Atomic beam preparation techniques using non-adiabatically changing magnetic field configurations in the transition region are described. The dependence of hydrogen maser oscillation on the energy level population within the atomic beam is theoretically investigated and the results are used for the analysis of the experimentally achieved atomic beam populations. It has been shown that a pulsed magnetic spin guidance field in the transition region, which switches between adiabatically changing magnetic field configurations and a sudden magnetic field reversal, results in an ensemble of hydrogen atoms with vanishing time averaged polarization, which does not deteriorate the conventionally achieved maser oscillation amplitude. 相似文献
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C. Mandache J. Nizet D. Leonard T. Bastin 《Applied physics. B, Lasers and optics》2012,107(3):675-677
In the construction and evaluation of the characteristics of a hydrogen maser, the oscillation parameter q remains an important parameter but somewhat difficult to determine precisely. Among the few techniques that exist to do such an evaluation we report on the technique using a variation of the quality factor of the microwave cavity. The results are compared to the standard theoretical model of operation of the maser accepted up to now. It is found that the technique described is extremely useful for determining the operational characteristics of such a maser. Furthermore, the experimental results and theoretical analysis are in reasonable agreement, which validates to a new level the hypothesis made in the development of the theory. 相似文献
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激光抽运铯束贮存泡激射器 总被引:1,自引:1,他引:0
本文提出一种铯原子束激射器的建议,其中利用了双束激光抽运选态技术和原子贮存泡方法。用密度矩阵理论分析了振荡条件,给出了激射器的振荡功率和进泡的原子束流之间的关系式。在使用TE021模腔和石腊作涂层的环状石英泡的情况下,计算了激射器的振荡功率、线宽和腔的填充因子,对激射器的短稳亦作了相应的估计。还给出了双原子束双隔离泡的此类激射器的设想。 相似文献
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V. V. Antsiferov 《Technical Physics》1998,43(10):1203-1208
Experimental results are presented on the achievement of single-frequency tunable lasing in ruby, Nd-glass, and Nd:YAG lasers
with electrooptic Q switching of the cavity by the injection of an external signal. An optimization of the parameters is carried out for lasers
on neodymium ions in yttrium aluminum garnet, lanthanum beryllate, chromium-doped gadolinium scandium gallium garnet, and
lanthanum hexaaluminate with passive Q switching of the cavity by means of lithium fluoride shutters containing F
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color centers. High-power single-frequency generation of giant pulses is achieved, with the output wavelength tunable over
the half-width of the gain lines of the active media.
Zh. Tekh. Fiz. 68, 74–79 (October 1998) 相似文献
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R. Schuch I. Bergström K. Blaum T. Fritioff Sz. Nagy A. Solders M. Suhonen 《Hyperfine Interactions》2006,173(1-3):73-83
We report here about measurements of reaction and decay Q values by precise determination of pairs of atomic masses. These were performed with the Penning trap mass spectrometer SMILETRAP.
Measurements with Penning traps give reliable and accurate masses, in particular Q values, due to the fact that certain systematic errors to a great deal cancel in the mass difference between the two atoms
defining the Q value. Some Q values that are of fundamental interest will be discussed here, for example, a new Q value for the 6Li (n,γ) 7Li reaction, for the β-decay of tritium, related to properties of the electron neutrino mass, and for the neutrino-less double
β-decay of 76Ge, related to the question of whether the neutrino is a Majorana particle or not. In case of the latter two we report the
most accurate Q values, namely 18,589.8(12) eV for the tritium decay and 2,038.997(46) keV for the neutrino-less double β-decay of 76Ge. 相似文献