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but purely theoreticaly,if I have 1mm fiber,all I really need is 1mm wide lense,is that correct? Or is there something going on that I dont understand that makes is that you need wider lense than the width of the beam you want to focus.

why are focal lenses so wide? if I need to focus laser from 1mm wide fibre,do I really need 30mm wide lense?

I wonder,if you send laser beam through thin optic cable,will the beam exit the cable already highly focused due to the thinnes of the cable so it doesnt even need focus lense? I reed the individual strands can be super thin and also have very big power carrying capacity.So theoreticaly can you...

Encap Thanks for link,I am going to read them all. I would like to ask all the smart members here to give me some good/interesting/information rich studies about this subject,also if you know some book that is about this air plasma phenomenon,then name it.I found so far "Applications of...

I will research it but I will ask anyway,how it exactly works that when gas is in normal state laser fly through it no problem,but the moment we turn it into plasma,it starts absorbing the laser beam.Why the wavelenght absorbion property changes?

I wonder,if alpha radiation is really better for making plasma than beta.One advantage I see is that it have maximum penetration in air about 2.5cm,so these flying particles hit the air in the focal point and not fly through it mostly like beta.Alpha decay is called ionising radiation,it...

Seoul_lasers Why do you think alpha radiation is best for it? I was thinking beta radiation was best becose it "shoots" free electrons away from atoms and I reed one study where they were turning air into plasma with laser and they said the free electrons in the focal point area are very...

You purposfully quoted only half of the sentence to really make it seem like my post was badly written.From wikipedia "Quoting out of context (sometimes referred to as contextomy or quote mining) is an informal fallacy and a type of false attribution in which a passage is removed from its...

you dont understand what I meant,I didnt meant generating x-rays with laser! I mean using radioactive material to lower ionisation threshold.This entire section you written completly missed the point,maybe I should be clearer,but when I explicitly described placing radioactive material "1cm"...

Lets imagine this,you have pulse laser with focus lense that you use to turn air or noble gases in hermeticaly sealed chamber into plasma.To ionise air with laser,the laser beam must reach certain power,it must get past the threshold required. Now,if we place a radioactive material,lets say...

1064nm is one of worst possible choices for ionizing air becose the absorption is very poor at this wavelenght,no wonder you need 1000s of watts.And thats exactly why I want to use wavelenght that is much more efficient so I dont need such powerfull laser

wait,so you want to tell me I need "1000s of watts" to do this? https://www.youtube.com/watch?v=AoWi10YVmfE https://www.youtube.com/watch?v=KfVS-npfVuY the first video there is small plasma,the second is alot bigger but it doesnt seem like 1000s of watts.I want to make something like in the...

hello everybody,I want to build laser,focus the beam and turn air into plasma. My problem is,I dont know what is the best wavelenght to do it with.I want a wavelenght that is most efficiently absorbed by air molecules.Please dont show me that chart of atmosferic absorption,its useless becose...