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population   inversion
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An experimental observation on stimulated emission of radiation at liquid nitrogen temperature is reported. The paramagnetic material is synthetic ruby with about 0.1% chromium in Al2O3. The pumping frequency lies at X-band range while the signal freqe-ncy is set at S-band. The dependence of saturation factor on pumping power is measured . The negative temperatuve effect on population distribution is observeb with a pumping power about 10-2 Watt. The ratio of population inversion is 0.44.

本文报导了在液氮温度范围内进行的微波受激发射的实验现象,工作物质是铬离子浓度为0.1%的人造红宝石。抽运频率和信号频率分别在X带和S带。测量了饱和因子和抽运功率的关系。用10~(-2)瓦级的X带抽运功率观测到信号能级的负温分布。得到粒子数的反转比为0.44。

We consider the nonlinear saturation of a fast x mode instability near the electron cyclotron frequency due to electron population inversion. A quasilinear theory is discussed. The corresponding saturation time, amplitudes as well as the temporal evolution of the electron distribution functions are also studied.

在有弱相对论性电子时,在电子迴旋频率Ω_e附近存在快x模的不稳定性。从这一事实出发,我们用准线性理论分析了具有粒子数倒转的分布函数引起的不稳定性最后达到饱和的物理机制。进行了一些近似的计算,求出了电磁迴旋不稳定性的饱和时间和饱和能量及垂直、平行分布函数随时间的演化过程。发现用此理论算出的饱和能级与观察到的AKR结果是一致的。

Two-photon lasers and laser amplifiers are studied by using the rate equations. The steady solution is obtained and its stability is analysed. The time evolution of large deviation from the steady solution is studied by using computer simulation. The population inversion and the trigger input must exceed certain thresholds to operate a two-photon laser. The method for producing giant-pulse is discussed. The possibility of building a pratical two-photon laser is analysed basing on the known data....

Two-photon lasers and laser amplifiers are studied by using the rate equations. The steady solution is obtained and its stability is analysed. The time evolution of large deviation from the steady solution is studied by using computer simulation. The population inversion and the trigger input must exceed certain thresholds to operate a two-photon laser. The method for producing giant-pulse is discussed. The possibility of building a pratical two-photon laser is analysed basing on the known data. A Doppler-i'ree two-photon laser needs much lower threshold but much more serious frequency matching among the atom system, cavity and the trigger input. Such a Doppler-free two-photon laser could find applications in laser spectroscopy and in the accurate metrology. Two-photon laser amplifiers distort the input waveform seriously. This distortion depends strongly on the input intensity.

用速率方程的方法研究了双光子激光器和双光子激光放大器,得到了双光子激光器的基本方程,同时研究了稳态解的稳定性问题。用计算机模拟计算了大范围偏离稳态值时的时间演化。双光子激光器必须有高于阈值的集居数反转和起动的触发脉冲。讨论了产生巨脉冲的方法。根据已知的数值指出建立双光子激光器的可能性,无多普勒加宽的双光子激光器要求低得多的阈值和苛刻得多的频率匹配,但可望在激光光谱学和基准测量中得到应用。双光子激光放大器对波形有严重的畸变,并对输入脉冲的强度存在着强烈的非线性依赖关系。

 
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