Mitsubishi 638nm 300mW CW

[Antimony Trioxide]

Has anyone put this diode into a pointer? Because I definitely want one.

 

[Prototype]

I don't think anyone here even has one. They're over $320 each, a lot of money to put down on one red diode, despite it's wavelength or power. Besides, most everyone's caught up in 445nm fever, just give it some time, someone will eventually.

 

[Antimony Trioxide]

So the Wicked Lasers 200mW 660nm sells for $50, and the new Mitsubishi 300mW costs >$320. :thinking:

 

[Prototype]

The 638nm diode is a lot brighter than 660nm. In fact I think 200mW of 638nm looks like 400mW of 660nm. I got those numbers from a thread by drlava, his kryton sale thread a while back.

 

[RA_pierce]

The 638nm diode is a lot brighter than 660nm. In fact I think 200mW of 638nm looks like 400mW of 660nm. I got those numbers from a thread by drlava, his kryton sale thread a while back.

I think the diode in Dr.Lava's laser was 642nm. The 638nm wavelength will be even brighter.

I want one of these...

 

[KGB_Productions]

Has anyone put this diode into a pointer? Because I definitely want one.

Check out the GB section @ PL. They are having a GB for the 500mw version of this diode. $280-$297


-Brooks

 

[Prototype]

Here's the pricing post from the group buy thread. This is for the 500mW model.

ML520G72 638nm 500mw Diode Group Buy

 

[flogged]

People over at <photonlexicon> seem happy with the diode thus far, at least for projection purposes. This would make good pointer also.

One thing to keep in mind is manufacturing tolerances mean each diode will have a unique lasing frequency at spec'ed temp (25C). The spread is from 632-644nm (My guess is statistically most of diodes lase close to 640nm). This is at 25C. There's a wavelength shift of .23nm/C, so assuming a die temp of at least 40C during operation this means add 5-10nm to this wavelength. Upshot is most of these diodes are gonna be lasing at >= 645nm during operation.

Perhaps not dramatically brighter than a good 300mW DVD diode? Because of the non-linear nature of the eye it takes something like 4x the power to appear 2x as bright.

See the spec sheet (for the 1/2 watt red!):
http://www.dpss.ro/manuals/spec_ML520G72.pdf

 

[Benm]

I guess this means cherry picking... 632 is so much brighter than 644 that it makes a factor two difference in visible light for the same output power. Spending this amount on a 644 diode would be a waste of money - you'd be just as well off with a good LOC at a fraction of the price.