What's the different between 637nm and 638nm?

[Draco]

sorry but i find this entire thread to be a little odd. is the laser in question 673 vs a 638 ? i saw in the first post the use of both 673 and 638?

[planters]

When I worked in a lab back in college I spent most of my time with the instruments, lasers, LN2 and chemicals, but we had several international grad students that asked me to edit their research papers. I knew just enough to grasp most of the technical content, but the improvement in grammar, spelling and sentence construction that I could suggest, made a real difference. Unlike the eventual reviewers, I could go back to the author and ask for clarification when I became hopelessly confused.

Bridge spontaneously offered this post and by the end of the OP, I could not tell why he made the post. It is an incredibly long winded lead up to "the other conclusion". Presumably, Laserwave has an optical table and a lab where they design and construct lasers. Why do we have to ask and only then get a couple of unlabeled beams, without measurements projected onto projector cases sitting on the floor in a hallway?
The bandwidth of all of these diodes is way more than 1nm. It would be more useful to give the actual model # and power output rather than a wavelength that varies more from diode to diode than the wavelength interval between diodes from different manufacturers!

I drive my P73s a little harder than you and cool them a lot more and I can get a little more than 4W after spatial filtering. But it is unlikely Laserwave is supercooling or spatial filtering. They probably should.

[catalanjo]

sorry but i find this entire thread to be a little odd.........

Not the only one mate !

Cheers

[bridge]

which we called 638nm you can see it is square beam, 637nm is round beam

sorry but i find this entire thread to be a little odd. is the laser in question 673 vs a 638 ? i saw in the first post the use of both 673 and 638?

[andy_con]

638 MM diode or
638 single mode diode?

[catalanjo]

638 MM diode or
638 single mode diode?

Neither !

"Sales mode"

Cheers

[drm916]

looks like he is just saying that he has mostly mastered the 638 optical train to have a similar beam size and divergence as a 637nm configuration.

The real question is what is the price difference between 637 and 638 modules. What is the price of a 1 watt 637 vs 638, What is price of 2 watt 637 vs 638, 3 watt, 4 watt, ETC. To me the 637 is almost always going to be nicer configuration, but at what price. At some point the lower price 638 becomes more attractive.

[catalanjo]

Aha! now we might be getting somewhere.

So what we "may" be discussing is whether stacking multiple (lots!) single mode diodes (using simple optics and a lot of patience)

Invariably give a better result than stacking a few (quad) multimode diodes (with possibly more sexy complicated optics)

Regardless of their colour but paying considerable attention to the price !

This just "might"......... get interesting !

Cheers