Electro optic modulation experimental apparatus

Electro optic modulation experimental apparatus（DGT-1)

Main parameters:
Electro optic crystal:LiNbO3(Lithium niobate); The light source is a semiconductor laser; wavelength650nmPower ≥2.5mW; Guide rail1000mmPolarizing film20mm；1/4Waveplate; Crystal bias voltage:0~400V(Digital display), AC internal modulation signal voltage0-40VPP; Frequency1KHZ(Continuously adjustable)

Experimental objective:

1.Master the principles and methods of crystal electro-optic modulation

2.Learn to use experimental equipment to measure the half wave voltage of crystals and calculate their electro-optic coefficients

3.Observation of the interference phenomenon of crystal focused polarized light caused by the electro-optic effect of crystals

4.Understand the demonstration process of optical communication

Experimental content:

1.Adjust the optical path system and observe the cone light diagram

2.Based on the transmittance curve of lithium niobate crystal, select the operating point, measure the half wave voltage, and calculate the electro-optic coefficient and compare it with the theoretical value

3.Change the DC bias voltage, select different operating points, and observe the modulation characteristics of the sine wave voltage

4.use1/4Use waveplates to change the operating point and observe the output characteristics

5.Demonstration of Optical Communication

Guo