What a LASER needs to set off PLASMA (ex. in mid-air)

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Hello, I didn't got an answer in the thread I posted this, so here I go with my own thread..:)

I got informed and read that the ionization of the air highly depends on the different wavelengths of the beam. About the short wavelengths was said that they are 'ionizing' and about the long wavelengths that they are 'not ionizing'. Now my problems started since I am also surrounded with informations which say that air ionization in the practical science world is being achieved with Infrared lasers o_O

Does that mean that it is much easier to build up the power of an Infrared laser than to use an Ultraviolet laser instead?

..Actually this is the real thing I want to know,

How do the different wavelengths of the laser beam relate to the needed power/energy per square cm when it comes to air ionization? And what is the reason for that?

I would really appreciate if I get the answer sooner, thanks :)
 
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