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本文报道了一种测量飞秒激光脉冲宽度的扫描自相关仪，其扫描频率为２５Ｈｚ，测量范围从２０ｆｓ到９００ｆｓ．采用的是ＢＢＯ倍频晶体，测量光谱范围从７００ｎｍ～１０００ｎｍ．
The letter reports a scanning autocorrelator which can measure mode locked femtosecond laser pulse duration.Its scan rate is 25Hz.Measurement scope is 20fs～900fs.It uses BBO as frequency doubling crystal.Measurement spectral scope is 700～1000nm.
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