实验4激光干涉仪测量位移实验-.ppt

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1、实验4激光干涉仪测量位移实验-Still waters run deep.流静水深流静水深,人静心深人静心深 Where there is life,there is hope。有生命必有希望。有生命必有希望2022/11/262Michelson interferometerSliver mirrorSliver mirrorSliver mirror with piezoSliver mirrorHeNe sourceEquipment2022/11/263nEquipment list1.He-Ne laser source2.Silver mirror3.Pizzo and contr

2、oller with power source4.Beam splitter5.Detectors6.Oscilloscope7.Analog signal source8.Other essential equipment in the optical experimentStep 12022/11/264Set up the HeNe laser source and make sure the beam can incident to the first collimation mirror in a straight line.Step 22022/11/265Set up the s

3、econd collimationmirror and then moving the beam to the other line and pass through the IrisStep 32022/11/266Using 2 Irises to collimate the beam.As shown in the picture,just confirm the beam light can across these two Iris perfectly.Step 42022/11/267Assembling the beam splitter and first reflect si

4、lver mirror according to the picture in this page.Step 52022/11/268Implement the second reflect mirror with Piezo and make sure all the reflect beam canbe intersected in the beam splitter.Step 62022/11/269Set up the detector to receive thecoherent beam from the beam Splitter and connect the detector

5、To 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.Piezo system tips2022/11/2610How to build up a piezo system?1)In order to drive a piezo,it is need a power supply and signal source.2)And als

6、o 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 Set up the APT2022/11/26111)Connect a 0-10V external source to the EXT IN connector on the rear panel.2)In the GUI panel,click

7、 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

8、 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.Expected results 2022/11/2612Questions2022/11/26131.Measure the lengths of the two arms of the interferometer and calculate the difference.The typical width of the spectrum

9、 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)