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11-03-2014, 03:15 AM #33
 Class 3B Laser Join Date: Jan 2014 Location: Iraq Posts: 4,291 Rep Power: 2141
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Re: Interested in Beam Expanders ???

Thank you, I have cut and paste' to a Word doc to study this further.

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http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

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11-03-2014, 03:30 PM #34
 Class 2 Laser Join Date: Jan 2011 Posts: 333 Rep Power: 184
lazeristasUVISIR
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Re: Interested in Beam Expanders ???

Another (free) software to use for an optical (telescope/expander) design
Psst! homepage

It has more features like a laser resonator design.
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11-06-2014, 11:30 PM #35
 Class 3R Laser Join Date: Feb 2009 Location: KY. Posts: 1,385 Rep Power: 389
Ehgemus
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Re: Interested in Beam Expanders ???

Will the optics in a rifle gun scope be usable for a beam expander?

11-07-2014, 01:04 AM #36
 Class 3R Laser Join Date: Jun 2007 Posts: 1,224 Rep Power: 340
steve001
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Re: Interested in Beam Expanders ???

Quote:
 Originally Posted by Ehgemus Will the optics in a rifle gun scope be usable for a beam expander?
Experiment.

11-07-2014, 02:48 AM #37
 Class 3R Laser Join Date: Feb 2009 Location: KY. Posts: 1,385 Rep Power: 389
Ehgemus
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Re: Interested in Beam Expanders ???

Quote:
 Originally Posted by steve001 Experiment.
I'm sure somebody can tell me if it's possible before I start tearing into gun scopes.

Reason why I suggested it because Walmart has gun scopes for about 11 bucks. Being as cheap as they are they probably have plastic lenses in them anyway.

11-07-2014, 03:49 AM #38
 Class 2M Laser Join Date: Jul 2013 Location: San Francisco Posts: 626 Rep Power: 90
upaa27
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Re: Interested in Beam Expanders ???

Quote:
 Originally Posted by Ehgemus Will the optics in a rifle gun scope be usable for a beam expander?
Should work. Just remember that the beam will not expand very quickly due to how the gun optics are made. Also plastic will get you a good bit off power loss if it's uncoated

12-13-2014, 01:58 AM #39
 Junior Member Join Date: Nov 2014 Location: Atlanta Posts: 27 Rep Power: 0
jaredsmitty
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Re: Interested in Beam Expanders ???

You can find some coated optics, glass lenses on the cheap from scopes. Best place for sampling would be a gun show. They aren't what they used to be. Now they're nothing more than 50% extended flea market full of alibaba.com dealers selling swords, optics, etc. 40% retail gun and gun part sales, 10% collectors.

You can find the optics for much less online, but going to a show will give you a good means to sample different brands and models. Barska often sells cheap optics with decent lenses.

The lenses are usually nice, but the assembly they come in is cheaply done and they often can't handle the kick of anything more than a .22 That's why they're typically cheap in price.

Last edited by jaredsmitty; 12-13-2014 at 01:58 AM.

12-13-2014, 02:29 AM #40
 Class 3B Laser Join Date: Jan 2014 Location: Iraq Posts: 4,291 Rep Power: 2141
Class 3B Laser

Join Date: Jan 2014
Location: Iraq
Posts: 4,291
Rep Power: 2141
Re: Interested in Beam Expanders ???

Watch out for small telescopes which turn the image back to the normal orientation, or back to upright, I believe most of them will have prisms in them which will cause extra loss you don't need in an expander.
__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

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

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

12-13-2014, 06:13 AM #41
 Class 2 Laser Join Date: Feb 2014 Location: Houston, Texas Posts: 347 Rep Power: 68
Jstr
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Re: Interested in Beam Expanders ???

That would be awesome if you started making these. I've always wanted one, but they're hard to find for the types of builds I have. I can't help much, but this got me thinking of the possibilities. You could make hosts with integrated beam expanders specially designed for each laser!
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