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07-03-2016, 08:30 AM #17
 Super Moderator Join Date: Jan 2014 Location: Qatar, land of the hot footed. Posts: 9,634 Rep Power: 1941186
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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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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: - https://laserpointerforums.com/f37

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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

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

07-03-2016, 09:11 AM #18
 Class 2 Laser Join Date: Dec 2015 Location: Bay area, California Posts: 257 Rep Power: 41666
green lasers rock
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Re: Question about 520nm 1.2 Watt

i thought you had a 1.2 watt 520.
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Skytech dual power pen 450nm 5/80 mw
Thor MII 445nm 1.3w(2 units)
Mits 500 c6 1w?, My first build
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)
NDG7475 520nm SS build 1.3w!
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: 7388
Yoshi1988
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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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07-03-2016, 07:09 PM #20
 Super Moderator Join Date: Jan 2014 Location: Qatar, land of the hot footed. Posts: 9,634 Rep Power: 1941186
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Join Date: Jan 2014
Location: Qatar, land of the hot footed.
Posts: 9,634
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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.
__________________

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: - https://laserpointerforums.com/f37

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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

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