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第 3 章 PowerPoint PPT Presentation


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第 3 章. 光辐射 的调制. §3.4 磁光调制. 磁光效应 当 光波通过某种磁性物质时 ,其传播特性发生变化,这种现象称为磁光效应 包括 法拉第旋转效应 、 克尔效应 、 磁致双 折射效应 等. 下面以 法拉第旋转效应 为例说明磁光调制的原理与过程. 3.4.1 法拉第旋转 效应. 一束线偏振光在有外加磁场作用下的介质中传播时,其偏振方向会发生旋转。旋转角度  的大小与沿光束方向的磁场强度 H 和光在介质中传播的长度 L 之积成正比  = VBL V 称为韦尔代 ( Verdet ) 常数

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第 3 章

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3

3


3

3.4


3 4 1

3.4.1

  • H L

    VBL

    • V(Verdet)


3

    • +c/nR -c/nL L :


3

A

A

AL

AL

AR

z

  • ZAAALARLAR(vLvR)ALA

= /2 nR nLL/


3


3 4 2

3.4.2

  • ()


3

  • (YIGGaYIG)zYIGz

  • Hdc


3

  • YIG H

  • HdcHdc

s

H0sinHt


3

3.5

  • (LDLED)


3

  • It()()


3

3.6

y

x

  • xy

  • xy()

    • A(x,y)A0T(x,y)

    • A(x,y)A0Texp[i(x,y)]


3

SLMSpatial Light Modulator

  • ()


3

  • ()

  • ()


3

Flash

- 3.0


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