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Phy b15 2
1.
2 )12( 2 cos2 2 λλ γδ +=+=
ktn ↑↓↓→ kr ,)1( γ k k-1 k-2 λ λ /) 2 2( 2max += tnk ↑↑→ kt λ λ γδ ktn =+= 2 cos2 2 暗纹 明纹 CAI 返回 退出
2.
λ∆γ∆γ ktn =sin2-)2(
2 2 )12( 2 cos2 2 λλ γδ +=+= ktn λ λ γδ ktn =+= 2 cos2 2 暗纹 明纹 1+− kk γγ γ∆−= γ λ sin2 2tn =1=k∆ ↑↓↓ γ∆γ ,,r ↓↑→ γ∆t CAI 退出返回
3.
[例1] 如用白光垂直入射到空气中厚为320nm的肥皂膜上 (其折射率n=1.33),问肥皂膜呈现什么色彩? 21 2 − = k nt λλ λ knt =+ 2 2 nm170041
== ntλk = 1 红外光 nm567 3 4 2 == ntλ nm341 5 4 3 == ntλ k = 2 黄光! k = 3 紫外光 退出返回
4.
[例2] 平面单色光垂直照射在厚度均匀的油膜上,油膜覆盖 在玻璃板上。所用光源波长可以连续变化,观察到500nm 与700nm波长的光在反射中消失。油膜的折射率为1.30, 玻璃折射率为1.50,求油膜的厚度。 按照相干条件,相邻两个干涉极小条纹所 对应的光程差满足: n1 n2 2 )12(2 1 1 λ +=
ktn 2 ]1)1(2[2 2 1 λ +−= ktn 2 )12( 2 )12( 21 λλ −=+ kk 21 nn < )mm(1073.6 4− ×=t3=k 退出返回
5.
a b wave train 波列 2.
相干长度 CAI 波列在真空中的长度x∆x∆δ > 无干涉 x∆δ <<0 实现相干叠加,产生干涉条纹 退出返回
6.
a b CAI 光程差为零,完全重叠,干 涉条纹的可见度最大。 0=δ 退出返回
7.
光程差增大,部分重叠,干 涉条纹的可见度减小。 x∆δ <<0 光程差超过波列本身的长度, 完全不能重叠,不能产生干 涉,干涉条纹的可见度为零。 x∆δ > CAI xm
∆δ = 相干长度 时间相干性 c t mδ ∆ = 相干时间 退出返回
8.
时间相干性是与光源的单色性联系在一起的 λ单色光 tcx ∆∆ = 波列 2 λλ∆∆
≈⋅x λ∆ 频谱宽度 λ∆ λ δ 2 ≈m 谱线宽度 光谱的单色性越好,相干长度就越长,时间相干性越好。 退出返回
9.
3. 薄膜的等厚干涉 (1)劈尖的干涉 CAI 返回 退出 半波损失
10.
ne θ n L d 2 )12( 2 2 λλ +=+ kne 暗纹 λ λ kne =+ 2 2 明纹 CAI 由于存在半波损失,棱边为零级暗纹 退出返回
11.
条纹级次 k 随着劈尖的厚度而变化,这种干涉称为等 厚干涉。条纹为一组平行于棱边的平行线。 λ λ knek
=+ 2 2 λ λ )1( 2 2 1 +=++ knek ke 1+ke θ n L d 明纹 明纹 CAI n eee kk 2 1 λ ∆ =−= +相邻条纹所对应的厚度差 退出返回
12.
n ee kk 2 1 λ =−+ CAI l n L d 2λ θ
=≈ ke 1+keθ 1+ke ↓→↓ ↑→↓ l l λ θ L n l dθ nl L d 2 λ = l L N = N n d 2 λ = 条纹数 退出返回
13.
2 1 λ =−+ kk ee a b ∆h b
a ∆h ke 1+ke 21 / h ee h b a kk λ ∆∆ = − = + 2 λ ∆ b a h = 退出返回
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