最新实验4激光干涉仪测量位移实验-PPT课件.ppt

实验4激光干涉仪测量位移实验-Michelson interferometerSliver mirrorSliver mirrorSliver mirror with piezoSliver mirrorHeNe source2022/11/22Step 6Set up the detector to receive thecoherent beam from the beam Splitter and connect the detectorTo the OSC and power supply.After that,all the preparations arefinished.Then,connect the analogsignal source to the piezo power supply to start the experiment.2022/11/29Piezo system tipsHow to build up a piezo system?1)In order to drive a piezo,it is need a power supply and signal source.2)And also need a software APT to control the power supply.In this experiment we are using the software download from Thorlabs http:/ connection can be find below:OutputSignal Source 2022/11/210Set up the APT1)Connect a 0-10V external source to the EXT IN connector on the rear panel.2)In the GUI panel,click the Settings button to display the settings panel.3)In the Drive Input Source(Open Loop)field,select Analogue Input(Ext In)+SW.4)In the Analogue Input Source(Ext In)field,select SMA Input.5)In the Feedback Loop field,select Open Loop.6)Click OK to save the settings and close the window.7)Two things need to remind,which are the voltage of signal source should be in the range of 8)0V10V,and the frequency needs keep blow 1KHz.2022/11/211Expected results 2022/11/212Questions1.Measure the lengths of the two arms of the interferometer and calculate the difference.The typical width of the spectrum of a HeNe laser is 1.5 GHz.Estimate its coherent length.Would you expect the length difference of the two arms of the interferometer has a significant effect on the interference visibility?Explain why.2.Discuss other effects that may reduce the interference visibility in your setup.Reference:Lecture notes on Coherent Optics(Advanced Optics I,week 18)2022/11/213