Old 01-22-2015, 07:37 PM #17
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Default Re: Green lasers beam combining

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Originally Posted by starlight View Post
I stared at his site and "never" looked to the left. I only was looking at the pictures as links to each category . Thanks
Thats funny - I've never once used the images as links, only the sidebar on the left!


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Old 01-23-2015, 12:00 AM #18
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Default Re: Green lasers beam combining

I dont understand how thats a good knife edge array for us. How are you going to adjust the mirrors after you attach them to the "fins" on that array?
I think its best to get mirror mounts and position them manually on a base plate.
That knife edge was probably scavenged from a video projector where the diodes where positioned perfectly so adjusting the mirrors themselves wasnt necessary, or the diode holders were adjustable instead, but for us this array seems useless.
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Old 01-23-2015, 03:10 PM #19
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Default Re: Green lasers beam combining

I'm sure you are right. Admittedly, I don't know anything about knife edge arrays. I just happened to see someone looking for some and remembered that I had seen some for sale from a reputable seller. I had no idea if they were any good or what you happened to be looking for. Just trying to help.

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Originally Posted by iroquois View Post
I dont understand how thats a good knife edge array for us. How are you going to adjust the mirrors after you attach them to the "fins" on that array?
I think its best to get mirror mounts and position them manually on a base plate.
That knife edge was probably scavenged from a video projector where the diodes where positioned perfectly so adjusting the mirrors themselves wasnt necessary, or the diode holders were adjustable instead, but for us this array seems useless.
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Old 01-24-2015, 11:10 PM #20
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Default Re: Green lasers beam combining

I always dreamed of several lasers mounted on a circular rack aimed at a large lens focusing onto an array of stearing crystals and finally concave lens lens. Sort of like a Deathstar configuration. I am not a machinist so I never attempted this. I'sure the focused dot would be like this. " * " depending on how many beams combined.
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Old 01-26-2015, 10:11 PM #21
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Default Re: Green lasers beam combining

YES- afaik all projectors from Kasio/BenQ etc have beam combining with knife edged mirrors and dichro mirrors HOWEVER I was never able to make much use of these and the mirrors themselves are NOT easy to 'harvest'-- BUt the dichro mirrors in these are usable for combining 3 or more wavelengths-

They (like the knife edging) need to be on an adjustable mount- w/o ...both near field and far field alignment will be difficult--
Knife edging works great for projects like LUMIA or SPIRO- where you dont care as much about how well the beams are 'stacked'

hope this has been helpful--hak

if you still want the 8 mirror kinfe edge from a Kasio - PM & I will mail you one for the cost to ship from Tx to Fl.
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Old 01-27-2015, 05:30 AM #22
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Default Re: Green lasers beam combining

I deleted all my old PM's before I sent the knife edge array out and haven't been able to remember who I owed it to and don't have the address anymore.
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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

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Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

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