3. If the wavelength of the light wave is, the wavelength difference is A2, and the corresponding frequency and - , prove that: frequency difference are marked as, Ay wavelength difference A2=2×10 nm, calculate the frequency difference and the coherence length. For the He-Ne laser with 2=632.8nm and the
3. If the wavelength of the light wave is, the wavelength difference is A2, and the corresponding frequency and - , prove that: frequency difference are marked as, Ay wavelength difference A2=2×10 nm, calculate the frequency difference and the coherence length. For the He-Ne laser with 2=632.8nm and the
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