相干驱动V能级原子的连续窄带激光
Continuous narrowband lasing with coherently driven V-level atoms
摘要：
同时强相干抽运两个衰减率相差很大的V能级原子，可以在较窄的跃迁上产生几乎完全的反转。以锶的蓝、红跃迁为例，说明在适当的工作条件下，相应的谐振增益可以用来连续地使激光器工作在箭形跃迁上.特别地，对于泵浦场相对于窄跃迁的强失谐，在接近裸原子跃迁频率处产生相干激光发射，散射到激光模的相干泵浦光的贡献可以忽略不计。计算腔输出光谱表明，由此产生的激光线宽可以远小于泵浦光的带宽，甚至小于窄线宽的自然线宽。原子跃迁对于适当选择的原子数，它的频率与原子跃迁频率密切相关。包括原子运动的模拟表明，多普勒冷却的强跃迁与激光跃迁的小运动加热，因此，在磁光阱的存在下的连续激光操作应该是可能的与当前的实验技术。
英文摘要：
Simultaneous strong coherent pumping of the two transitions of a V-level atom with very differentdecay rates has been predicted to create almost perfect inversion on the narrower transition. Usingthe example of the blue and red transitions in Strontium we show that for suitable operatingconditions the corresponding resonant gain can be used to continuously operate a laser on thenarrow transition. In particular, for a strong detuning of the pump field with respect to the narrowtransition, coherent laser emission occurs close to the bare atomic transition frequency exhibitingonly a negligible contribution from coherent pump light scattered into the lasing mode.Calculations of the cavity output spectrum show that the resulting laser linewidth can get muchsmaller than the bandwidth of the pump light and even the natural linewidth of the narrow atomictransition. Its frequency is closely tied to the atomic transition frequency for properly chosen atomnumbers. Simulations including atomic motionshow Doppler cooling on the strong transitionwith minor motion heating on the lasing transition, so that continuous laser operation in thepresence of a magneto-optical trap should be possible with current experimental technology.
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