Old 08-25-2015, 04:10 PM #1
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Default Beam diverging lens?

Hi.

I'm putting together something where I need two lasers (red and blue) to each diverge to 1m diameter over a throw of 5m.

Any thoughts on a suitable lens? I'm thinking of using C Mount CCTV lenses. Would that work? 25mm seems about right. And should I be buying something with a fat beam?

Thoughts?

Cheers!



Last edited by FranB; 08-25-2015 at 04:11 PM.
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Old 08-26-2015, 09:26 PM #2
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Default Re: Beam diverging lens?

Do you care if the spot is round or a broad rectangular stripe? If you want it to be round, maybe a 532nm DPSS green laser you can defocus is all you need.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


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

YAG Power Calc. Laser Peak Power Calculator - Ophir

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

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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Old 08-26-2015, 09:56 PM #3
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Default Re: Beam diverging lens?

Why do you need two threads? Stick with your first one:

http://laserpointerforums.com/f42/ad...ml#post1376456
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Old 08-26-2015, 10:17 PM #4
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Default Re: Beam diverging lens?

well, there's a lot unanswered here...

i see you posted another thread about this but didn't get anywhere, avoid giving up on threads in the future, just add more info and if you need post again if anyone else can help.

i would reccomend these two lasers: https://sites.google.com/site/dtrlpf...m-pl450-diodes for blue, and this one: https://sites.google.com/site/dtrlpf...le-mode-diodes for red.

they are just modules, so you have to wire them up properly and have them set to the correct current for the desired output power. however, they do have adjustable focus, which means you can focus them and easily make them diverge to the size you need yourself.

this is not safe, and i don't really recommend it becuase of the point-like source of the light, which makes vision damage more likely.
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638nm HL63193MG @1.2A, S1 lens, 501B, 860mW
532nm 150mW HL from laserbtb
515nm 30mw HL-515 laserbtb
450nm 200mW PLT5 450B in Sanwu Pocket series
445nm 1300mw
405nm BDR-209 16x, 850mw, S4 host

Laserbee A 2W LPM 1mw resolution.

I have a good basic understanding of DPSS and gas lasers, so if you have questions, feel free to PM me! I don't know anything about electronics though.

Last edited by micheal rosen; 08-26-2015 at 10:18 PM.
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Old 08-26-2015, 11:29 PM #5
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Default Re: Beam diverging lens?

If these are going to be where someone could look directly into the beam or at the laser output, the bigger challenge is to find low enough power ones you can de-focus.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


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

YAG Power Calc. Laser Peak Power Calculator - Ophir

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

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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Old 08-26-2015, 11:31 PM #6
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Default Re: Beam diverging lens?

Quote:
Originally Posted by Alaskan View Post
If these are going to be where someone could look directly into the beam or at the laser output, the bigger challenge is to find low enough power ones you can de-focus.
or he can just ask DTR to set the drivers to a lower current and underdrive them, i can see a problem there.

is there a required light intensity for this project?
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638nm HL63193MG @1.2A, S1 lens, 501B, 860mW
532nm 150mW HL from laserbtb
515nm 30mw HL-515 laserbtb
450nm 200mW PLT5 450B in Sanwu Pocket series
445nm 1300mw
405nm BDR-209 16x, 850mw, S4 host

Laserbee A 2W LPM 1mw resolution.

I have a good basic understanding of DPSS and gas lasers, so if you have questions, feel free to PM me! I don't know anything about electronics though.
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