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08-05-2015, 04:41 AM #1
 Class 3B Laser Join Date: Jan 2014 Location: Iraq Posts: 4,302 Rep Power: 2141
Class 3B Laser

Join Date: Jan 2014
Location: Iraq
Posts: 4,302
Rep Power: 2141
NDG7475 Raw Beam Output Diameter @ 4 inches?

Can someone do me a favor and measure the diameter of the output of a NDG7475 520nm green laser diode four inches away from it? I am away from home and trying to work on a new host and need to know.

Chris

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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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08-10-2015, 10:51 PM #2
 Class 1 Laser Join Date: Jul 2014 Posts: 57 Rep Power: 128
Eracoy
Class 1 Laser

Join Date: Jul 2014
Posts: 57
Rep Power: 128
Re: NDG7475 Raw Beam Output Diameter @ 4 inches?

With a G2 lens and focused to infinity, I get a spot size of 9.53mm by 1.59mm at 4 inches from the lens. With a 3 element lens, I get a better defined spot (less splash) which measures 6.34mm by 2.39mm.

If you'd like me to test it at a different focus or distance, let me know =)
__________________
405nm 700mW S06J 12X
405nm 800mW BDR-209 16X
405nm 900mW BDR-209 16X
445nm 800mW M140
462nm 1800mW M462
465nm 4W+ NUBM07E
520nm 200mW PLP520-B1
520nm 1400mW NDG7475
532nm 303
589nm 30mW Spartan
650nm 200mw
650nm 150mw
X10DR 10x Beam Expander

Last edited by Eracoy; 08-10-2015 at 11:10 PM.

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