Question

1. KDP A typical electro-optic amplitude modulator is shown above. A linearly polarized beam with wavelength 633nm is sent a KDP crystal which is oriented such that when a voltage is applied across its faces the index of refraction along y-axis and x-axis make an angle of 45 degrees with respect to the input polarization. This results in a phase change between the x and y components of the input beam. For KDP, the electro-optic coefficient is given as r6 24.1E-12 m/V. no 1.502 and ne 1.462. a) What is the half-wave voltage? b) What is the quarter-wave voltage? c) If the crystal is 1cm long, what is the applied external electric field for the case in a)?

Answer 1

2. 丨.so2 633 m = ak ve レ Half 3 uo tapee 63 -12 3 Hal f - wave 3 63 633 x10 -1 2 13 8 V ˇ -1938V Knouw Civen lerg of the Cvjst. - 1Cm