当上能级粒子数处于未反转分布态时，具有较大的发射截面与吸收截面比值的波长信道拥有相对较大的增益竞争优势。
When the upper state population is not reversed, the channel with greater ratio of emission and absorption cross-section has greater competitive advantage.
当上能级粒子数处于未反转分布态时，具有较大的发射截面与吸收截面比值的波长信道拥有相对较大的增益竞争优势。
When the upper state population is not reversed, the channel with greater ratio of emission and absorption cross-section has greater competitive advantage.
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