The specimens have large absorption and emission cross section.
样品具有较大的吸收和发射截面。
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。
It is found that these kinds of glasses have good thermal stability, broad FWHM and large stimulated emission cross-section.
结果表明：这种玻璃具有较宽的荧光半高宽、较大的受激发射截面，较好的热稳定性。
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