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下图所示调Q红宝石激光器的两面反射镜的透过率分别为T 2 =0，T 1 =0.2，光束截面积A=0.8cm 2 ，腔长L=15cm，红宝石工作物质长度l g =10cm，折射率η g =1.78，发射中心波长λ 0 为694.3nm，发射截面σ=2.5×10 -20 cm -2 ，为方便计算，假定能级的统计权重相等。Q开关长度l s 为2cm，折射率η s =2.7；Q开关打开时的附加损耗系数α s =0.1cm -1 ，腔内其他参数如图中所示。若该器件被泵到阈值增益的4倍，试求其Q开关打开时的起始反转粒子数密度，调Q脉冲峰值功率、脉冲输出能量和脉冲宽度。
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【简答题】n. 丑闻 首字母s
【简答题】物业管理专业学生在学习过程中会有两个重要实习,分别是( )和( ),这两门课同时也是物业管理专业的专业核心课。
【单选题】The main reason why two major airlines went bankrupt recently was that
A.
the recession had reduced the overall number of air passengers.
B.
the companies failed to attract an adequate number of passengers.
C.
competitions from other airliners took away all their trade.
D.
they introduced cheap flights for all categories of passengers.
【简答题】In the meantime, consumers are forced to make a choice between just two US and two UK airlines, which provide 95 percent of transatlantic services from Heathrow.
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