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New 1.2w 638 diode CHECk IT OUT!

CaliKirk

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Yeah I had the hopes up on the title as id love to see more red, but it's still promising that new 638s are still coming out. I'd be a happy man if I could have a 2w+ 638! Really, who wouldn't be?
 



Podo

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BONUS :D

Starting from the top:
Mitsu 500mw
NEW Hitachi 1.2W diode
Mitsu Dual beam diode
Mitsu G84 Tri beam diode

viuBepP.jpg



gp6mxHc.jpg
 
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Atomicrox

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+rep for that great comparison picture. It would be *really* cool to have one of these with most of the diodes available to us!
 

Pman

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Yup, I've got the same 1.3W with one of my mits also;)
Cool pics Podo
 

Encap

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Then I thought about the wavelength, typically, the longer the wavelength, the higher the divergence and combining long wavelength with multimode and you get the worst of the worst in regards to mRad for the size of the emitter.

The divergence and beam shape of this diode would be acceptable if you used corrective optics and expanded the beam out to one inch diameter or more, but one inch/25 mm minimum for what I like to see. I love fat beams but the wider they are the more power you need to see them well, and red being a long wavelength our eyes are not as sensitive to that color requiring even more power to make an awesome looking beam. PBS combine two of these diodes, use a 30mm collimating lens and then you might have a decent fat beam pointer project using these, even without corrective optics if doing that with a + shaped output.

I've taken the time to go through how this works for the newbies, although fairly simple it took me a long time to catch on to what is happening with something like this.

Hey Alaskan---you're an optics and divergence enthusiast/specialist ---check out post #18 in this thread here for something I am pretty sure you have never encountered but is way out there X-files cool--- See #18 of thread:http://laserpointerforums.com/f44/world-first-high-power-underwater-handheld-laser-98630-2.html

"The optical properties of water can be manipulated with very intense laser light to act like a focusing lens, allowing nonlinear self-focusing to take place. At the same time slightly different laser wavelengths travel at different speeds in water due to group velocity dispersion and can be arranged so that a laser pulse also compresses in time as it travels through water, further concentrating the light"
 
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badboybilly

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Hey Podo
I just saw your NUBM47 A1 laser on utube hitting 8.8w, old video but I'm curious what current you had it set to, was it a freak diode, did you just take it out of the freezer before the LPM test, I have 2 A1s set at 5a and both average 7.2w!
 

Alaskan

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E ncap, responded in the water thread, interesting stuff, now I'm wondering what cool stuff could be done with a water lens of some type.
 

Podo

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Hey Podo
I just saw your NUBM47 A1 laser on utube hitting 8.8w, old video but I'm curious what current you had it set to, was it a freak diode, did you just take it out of the freezer before the LPM test, I have 2 A1s set at 5a and both average 7.2w!

Yes, I put the laser into freezer first and there is actually a ice pack cooling it when I did the test to see how strong the diode can go with such setting.
 
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Alaskan

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What happened with the G84 tri-beam 638nm laser diodes, were they just a limited run, I don't see them on eBay anymore.
 

Light superglue

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Hi Podo,

I wanted to start a new thread but maybe to revive this one is not a bad idea...
I saw you have a good colection of red LDs to compare.
Did you accidentaly have a chance to check out this one - I found it on goldenstarlaser page:

RED 638 2500mw

Seeing that the name ends with G84 it might be a chinese version of Mitsu 3-beam diode or maybe something completely new?
Not cheap anyway and min 10 pieces to buy...
 

Light superglue

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Mitsubishi Tri-beam has code ML562G84,
this one JLD6325ZA-G84.

Why do you think it is the same, do the LD codes mean nothing?

Yes, they both end with G84 (this is why my question) but rest of signs are different.
 




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