Old 03-01-2018, 09:58 PM #17
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Default Re: The best chance to get real 1w green laser.

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Originally Posted by Alaskan View Post
Copy cats! For these multimode diodes, Iím surprised everyone is still using those small 6.3 mm adpheric lenses because the divergence is so bad with those you canít put a spot on a cloud base, 2.5 mRad and above are too wide after a few hundred feet, needs to be no greater than 1.5 mRad for a 3,000 to 5,000 ft cloud base, but much better at 1.2, might seem like not much difference, but it is. I suppose it isnít a big deal if all you want it for is close in, lots of people donít care about divergence, they just want to see a pretty beam coming out the end, or burn. To each their own.
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Originally Posted by Radim View Post
Nothing to my Optobeast, but if you like JL PLE-Pro host (and maybe cannot afford original) and/or wish to have cheapo laser, why not? Still the beamspecs are not really what I would go for - anyway nice "flashlight".
I hope the next laser evolution will be lasers combining high power with low divergence (= or < 1.2mrd and beam shaping optics.


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Old 03-01-2018, 10:06 PM #18
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Default Re: The best chance to get real 1w green laser.

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I hope the next laser evolution will be lasers combining high power with low divergence (= or < 1.2mrd and beam shaping optics.
Ahhh I really hope so! It seems that high powered diodes are being used either for projectors or engravers, both of which don't mind the high divergence. The engravers just used the focal point and the diodes don't need low divergence either. But one can hope!
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Old 03-02-2018, 11:20 AM #19
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Default Re: The best chance to get real 1w green laser.

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I mean compare with blue laser. green laser is good at brightness, blue laser is good at burning.
In my world.... 1 Watt of Laser Power is 1 Watt....

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Old 03-02-2018, 09:24 PM #20
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Default Re: The best chance to get real 1w green laser.

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In my world.... 1 Watt of Laser Power is 1 Watt....

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Mine, too. But, power density depends on beam profile, or spot, size.
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Old 03-02-2018, 09:44 PM #21
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Default Re: The best chance to get real 1w green laser.

Since no one will make them for multimode diodes, we are having to build our own laser pointers incorporating both beam correction and a larger diameter collimation lens to get the divergence down to 1.5 or lower mRad, but very uncommon to see even those being built. I keep hoping someone will build them for us, but not holding my breath, I'll turn 450 nm and pass out if I do.
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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'.

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Old 03-02-2018, 10:59 PM #22
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Default Re: The best chance to get real 1w green laser.

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Originally Posted by Alaskan View Post
Since no one will make them for multimode diodes, we are having to build our own laser pointers incorporating both beam correction and a larger diameter collimation lens to get the divergence down to 1.5 or lower mRad, but very uncommon to see even those being built. I keep hoping someone will build them for us, but not holding my breath, I'll turn 450 nm and pass out if I do.
Sanwu could for their Challenger series. Those have modular construction.
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Old 03-03-2018, 02:17 AM #23
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Default Re: The best chance to get real 1w green laser.

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Originally Posted by Alaskan View Post
Since no one will make them for multimode diodes, we are having to build our own laser pointers incorporating both beam correction and a larger diameter collimation lens to get the divergence down to 1.5 or lower mRad, but very uncommon to see even those being built. I keep hoping someone will build them for us, but not holding my breath, I'll turn 450 nm and pass out if I do.
That nobody bothers is a business decision--probably because it would have no effect on sales and just be another thing to worry about building, stocking and warrantying, would not sell well if at all, and be expensive to do.
Is a small niche within a small niche within a micro-niche market --not many people know enough to consider the questions much less purchase an answer.
Even on LPF there are what 3 or 4 people that care enough to want to play with cylinder pairs, beam correction, and beam expanders for correcting the nature of laser diodes not intended for or designed by the diode makers for use in hand held lasers.
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Old 03-03-2018, 03:32 AM #24
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Default Re: The best chance to get real 1w green laser.

Yeah, I think it highly unlikely any Chinese laser suppliers would consider using cyl lenses to correct divergence in these MM diodes. Far too much trouble for a tiny number of sales. It's a lot easier and more profitable to sell BEs as an accessory.
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Old 03-03-2018, 04:13 AM #25
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Default Re: The best chance to get real 1w green laser.

Maybe true for fancy beam correction of the slow axis output of a diode to even things up, or make the shape more square, but I am not sure it is a looser for reducing the divergence of the newer higher power laser diodes without beam correction, or without using cylinder lenses, just a longer focal length, larger diameter lens wold help a lot. More and more this will become an issue as power is increased due to wider emitters, NUBM44 an example, I believe pointers with that diode in them would sell better if their divergence was brought way down from the current ~11 mRad offerings.
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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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Old 03-03-2018, 05:26 AM #26
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Default Re: The best chance to get real 1w green laser.

That is true of experienced buyers, but I think they sell plenty to young, inexperienced people who see 7 watts and don't ask another question. The only thing going through their minds is, "I've gotta have that."
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Old 03-03-2018, 07:53 AM #27
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Default Re: The best chance to get real 1w green laser.

Well, JL offers beam expanders to reduce divergence and they are selling, not as fast as pointers without them I am sure, but they have reduced divergence that way and are making money on them. Although in that case, as an add on to help sell their main product.
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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
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Old 03-03-2018, 11:13 AM #28
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Default Re: The best chance to get real 1w green laser.

I'm familiar with the Challenger series which is completely modular in construction. For that model an accessory could be constructed either by Sanwu or anyone with a lathe.
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