The ultraviolet absorption peak narrows, absorption intensity increases, the absorption margin becomes steep and moves to longer wavelength, the optical band gap decreases as well.

紫外吸收峰变窄，强度增加，吸收边变得陡峭并向长波方向移动，光学带隙降低。

youdao

After technology stock bubble collapsed in 2001, optical component industry plummeted. But, it regained from 2004. The gross profit margin increased year by year, even peaked in 2007 and 2008.

光电子行业自2001年科技股泡沫崩溃后一落千丈，不过从2004年就逐渐恢复元气，毛利率逐年攀升，在2007、2008年达到巅峰。

youdao

The power margin of the optical fiber relay system is determined from the loss transfer function.

利用损耗传递参量确定中继系统功率容限；

youdao

Not exactly--Nortel was looking at shedding the low-margin bottom of its optical-components business, saving the jazziest lines for itself.

FORBES: Lighting up Nortel