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Homework Help: Wavelength and laser basics (ND:YAG)

  1. Jul 29, 2017 #1
    Hey guys!
    I hope my English skills are enough to describe my problems sufficiently.

    (The problem statement, all variables and given/known data)

    I. Following the following picture, what wavelength should a laser be used to process aluminum?

    II. What metal surface can be cleaned with a frequency-doubled NDYAG laser?

    To I:
    The literature says that both ND: YAG and CO2 lasers can be used for this. The high reflection rate can be operated by both laser types

    To II:
    Such a laser has a wavelength of 532 nm and is particularly suitable for reflecting surfaces, corresponding to a significant advantage over a Co2 laser. Which metals are primarily to be mentioned here? Silver? Or is my approach wrong?

    I am glad about every contribution and every help (:
    Last edited by a moderator: Jul 29, 2017
  2. jcsd
  3. Jul 29, 2017 #2


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    Doubling the frequency is half the wavelength. You are correct there. From the graph, all metals except silver will be absorbing a significant portion of energy at this wavelength.
  4. Jul 30, 2017 #3
    Many thanks for your response!

    However, I do not quite understand how the diagram is to be read. Is the value with the least absoption at 532nm to be read (ie Ag)?
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