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07-03-2016, 08:30 AM #17
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,279 Rep Power: 2124
Class 3B Laser

Join Date: Jan 2014
Location: Near Mosul, Iraq
Posts: 4,279
Rep Power: 2124
Re: Question about 520nm 1.2 Watt

If I remember correctly, the NDG7475 1W 520nm laser diode has about 3 mRad divergence when using a 6mm diameter G2 lens, does anyone have solid figures?

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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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Last edited by Alaskan; 07-03-2016 at 08:40 AM.

07-03-2016, 09:11 AM #18
 Class 1M Laser Join Date: Dec 2015 Location: Bay area, California Posts: 217 Rep Power: 137
green lasers rock
Class 1M Laser

Join Date: Dec 2015
Location: Bay area, California
Posts: 217
Rep Power: 137
Re: Question about 520nm 1.2 Watt

i thought you had a 1.2 watt 520.
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My Notable Lasers

Skytech dual power pen 450nm 5/80 mw
Thor MII 445nm 1.3w(2 units)
Prome red 650nm 200mW
Laserlands 635nm 5mW(2 units)
EBAY 08-3 532NM ?mW(much brighter than 303s)
Sanwu 303 with pattern caps 532nm 70mW(2 units)

650nm, 532nm, and 405nm overspec 301/303s and pens

07-03-2016, 10:06 AM #19
 Class 2 Laser Join Date: Mar 2016 Location: Minnesota U.S.A Posts: 321 Rep Power: 262
Yoshi1988
Class 2 Laser

Join Date: Mar 2016
Location: Minnesota U.S.A
Posts: 321
Rep Power: 262
Re: Question about 520nm 1.2 Watt

I actually have a 1.4W 520nm... This post was from before I bought the laser.
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405nm 200mw Xpro
405nm 1000mw Alien
445nm 1600mw Sanwu
450nm 7300mw Alien
465nm 4700mw Alien
470nm 1900mw Alien
520nm 1400mw Alien
532nm 200mw Xpro
638nm 1000mw Alien
650nm 200mw Xpro

07-03-2016, 07:09 PM #20
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,279 Rep Power: 2124
Class 3B Laser

Join Date: Jan 2014
Location: Near Mosul, Iraq
Posts: 4,279
Rep Power: 2124
Re: Question about 520nm 1.2 Watt

I found a post from someone two years ago who had a newly released NDG7475 and he was getting 2.7 mRad with a bit less than a 1mm wide beam diameter using a 4.6 FL aspheric lens. That seems to be a very low amount of divergence for a 1mm wide beam, I expected that amount of divergence with a 3 to 4mm beam diameter. I wonder if he was measuring correctly? Still looking for divergence figures.
__________________

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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