Wavelength and laser basics (ND:YAG)

[joslaz90]

Hey guys!
I hope my English skills are enough to describe my problems sufficiently.(Homework Statement )

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 (:

 

[scottdave]

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.

 

[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)?