Wavelength and laser basics (ND:YAG)

AI Thread Summary
For processing aluminum, both ND:YAG and CO2 lasers are effective due to their high reflection rates. A frequency-doubled ND:YAG laser operates at a wavelength of 532 nm, making it suitable for cleaning reflective metal surfaces. Silver is noted as a metal that may not absorb significant energy at this wavelength, while most others will absorb more. The discussion also highlights confusion regarding interpreting absorption diagrams, particularly in relation to the absorption characteristics of different metals at 532 nm. Understanding these principles is crucial for effective laser application in metal processing.
joslaz90
Hey guys!
I hope my English skills are enough to describe my problems sufficiently.(Homework Statement )
Unbenannt.PNG


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 (:
 
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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.
 
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Likes joslaz90
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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