摘要
对导入一分为二光纤的激光进行强度调制,改变其调制频率,经光电转换后送入示波器监测X-Y合成的李萨茹图形,使两路激光输出信号相位差为2π整数倍.利用调制频率和光程差即可计算出光速.
After variable frequency modulation,a laser beam exported from a fiber is divided into two ways.By frequency adjustment the phase difference of the two laser beam can be fitted to integer multiples of 2π through observation of the synthesis graph in oscillograph. By using the value of the frequency,the speed of light can be calculated.
出处
《大学物理》
北大核心
2015年第6期33-35,共3页
College Physics
关键词
频率
光纤
光速
相位差
frequency
fiber
light speed
phase difference
