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By Lan Xinju

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2-40)  Chapter 1 22 Laser Modulation and Deflection Technology Rs Electro-optic C0 crystal Vs Fig. 2-11 RL L The parallel resonance circuit of the modulator As it is, the modulation bandwidth depends on the specific application requirements. 2-42) By making use of Eqs. 2-43) where L is the length of the crystal, A is the cross sectional area of normal to L, and ε is the dielectric constant. It is known from the above equation that when the crystal’s category, dimensions, laser wavelength, and phase retardation required are determined, its modulating power will be proportional to its modulating bandwidth.

2-9) and Eq. 2-30)  Chapter 1 16 Laser Modulation and Deflection Technology where T is called the transmissivity of the modulator. Based on the above-mentioned relationship, the curve of the light intensity modulating characteristics can be plotted as shown in Fig. 2-6. It can be seen from the figure that, in general, the relationship between the output characteristics of the modulator and the externally applied voltage is nonlinear. If the modulator is operating in the nonlinear part, the modulating light will get distorted.

2-56). The ratio of the output light intensity (TM) to the input light intensity (TE) can be obtained from Eq. 2-60) 2 while 2πn30 γ L V Δϕ = 2κL = λ d where d represents the thickness of the waveguide thin film, whose transmissivity curve obtained by experiment is shown in Fig. 2-15. 7 I sin2 π V−12 2 84 I0 ( 6 ) I0/I1 5 4 3 2 1 10 Fig. 2-15 20 30 V/V 40 50 60 The transmissivity of a waveguide placed between intersecting polarizers /DVHU7HFKQRORJ\SGI/DVHU7HFKQRORJ\SGI  Chapter 1 28 Laser Modulation and Deflection Technology 2.

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