andy_con
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cos i build lots of module so have worked out my own system for spacing etc...
waveplates can be purchased from laser-wave.co.uk they are only £30 odd so not expensive
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ArcticMyst Security by Avery
10 diode 445 build
- Thread starter andy_con
- Start date
cos i build lots of module so have worked out my own system for spacing etc...
waveplates can be purchased from laser-wave.co.uk they are only £30 odd so not expensive
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Wow! and i thought the 8 diode was epic.
I lol'd at the melted ruler xD you must need to snap the pic quickly before you ruin it.
I'm also into machining so i can say it sports a neat finish considering the surfacing was probably done with a flycutter right? Also, what kind of lenses is this build sporting?
I lol'd at the melted ruler xD you must need to snap the pic quickly before you ruin it.
I'm also into machining so i can say it sports a neat finish considering the surfacing was probably done with a flycutter right? Also, what kind of lenses is this build sporting?
andy_con
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yes i had to borrow a big vice so i could fly cut in two halfs. but ive got some wet and dry to try for next time.
im using olike lens
bobhaha
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What does the wave plate actually do?
On Laserwave-uk the description says "for adjusting the polarity of a laser beams"
I cant find any simple info via google... What is the polarization of a normal laser? Why does it need to be adjusted? Does this just rotate the beam 90 degrees so you get a square beam?
Me no understandy...?
On Laserwave-uk the description says "for adjusting the polarity of a laser beams"
I cant find any simple info via google... What is the polarization of a normal laser? Why does it need to be adjusted? Does this just rotate the beam 90 degrees so you get a square beam?
Me no understandy...?
andy_con
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a laser beam is polarized in a certain directions.
so take two seperate laser beams in this directions I and shine them into a cube, both will go straight through and out the outside. this is no good. so if you rotate one of the beams to -, so you have one I and one - shine them into a cube one will go straight through the other will be bounced at 90 degrees inside the cube and come out the same direction as the one going straight through. so you can combine both beams and you get a + shape
now the problem with a + shape is its not a dot or a square its a bit gay. so we use a waveplate. a waveplate does not rotate the beam. shine a beam at I direction into a waveplate and it will stay at I, but its changed the polarization. so now you can shine two beams at I direction into a cube add a waveplate to one and out you get a I shape beam.
make any sense?
so take two seperate laser beams in this directions I and shine them into a cube, both will go straight through and out the outside. this is no good. so if you rotate one of the beams to -, so you have one I and one - shine them into a cube one will go straight through the other will be bounced at 90 degrees inside the cube and come out the same direction as the one going straight through. so you can combine both beams and you get a + shape
now the problem with a + shape is its not a dot or a square its a bit gay. so we use a waveplate. a waveplate does not rotate the beam. shine a beam at I direction into a waveplate and it will stay at I, but its changed the polarization. so now you can shine two beams at I direction into a cube add a waveplate to one and out you get a I shape beam.
make any sense?
bobhaha
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Ok that makes sense... but why would it matter if the beams are "I" or "-" when combining in a PBS?
andy_con
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cos - or I changes the polarization of the beam
bobhaha
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I know... but why can't you combine two I's?
andy_con
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cos as i said if you put two I into a cube both will go straight through, cos both polarizations are the same.
bobhaha
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Ok a little bit of research is telling me that the PBS works by reflecting a polarized laser beam. I never knew the actual PBS works this way... now things are making sense.
So basically by shifting an incoming "I" beam to a "-" beam you are effectively changing the polarization of the beam in order for the PBS to reflect the incoming beam (otherwise it would pass right through). But if you use a 1/2 wave plate... it basically changes the polarization without changing the beams shape.
Is that correct?
So basically by shifting an incoming "I" beam to a "-" beam you are effectively changing the polarization of the beam in order for the PBS to reflect the incoming beam (otherwise it would pass right through). But if you use a 1/2 wave plate... it basically changes the polarization without changing the beams shape.
Is that correct?
andy_con
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spot on 
DrSid
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Why aren't we seeing this thing burning stuff ? Like cars, intercontinental missiles, aliens, and so on ?
andy_con
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i didnt build a £5000 to burn some fooking tape or pop a balloon
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how much power is lost through the cube?
andy_con
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not much a few 100 mw's
but remember i cam putting 10000mw in
but remember i cam putting 10000mw in
Last edited:
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i assumed more cool!:eg:
