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在原子衰减常数相等、单光子失谐不太大且饱和不太深的条件下,对于两个适当的原子-场耦合常数,简并双光子激光系统一方面能够呈现无反转激光,另一方面又能够呈现无激光反转。In this paper, it is revealed that, degenerate two-photon lasers can show both lasing without inversion and without lasing, for two proper atom-field coupling coefficients, under the condition of equal atomic decay rates, not too large single-photon detunings, and not too saturation.
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