Optima lens for reds

[steve-o]

I remember these lenses were popular for a while for the 638 diodes, but since Dave started selling the 2mm fl lenses for the G71 and the P73 mitsi diodes they really can't be beat/ are these better? What diodes are these being used with- like a 63133 or something?

[planters]

I have used a lot (dozens) of these with the LOC diodes and Dave sells a 9x 0.5 mm threaded mount for them that works a lot better than the company's 3/8x 64(?) mount. They sell direct and have a minimuim order of $100 (ie 6 lenses). For these diodes they perform extremely well as in 97% throughput and very round , 1/2 mrad divergence. If the world is fair and at twice the focal length of Dave's lenses they produce 1/2 the divergence, then I think they would be an interesting lens for a dual module where their 3-4mm high stripe would fit a scanner well and where stacking was not going to be used.

[steve-o]

So, these lenses are mainly used for 658-660nm diodes?

[andy_con]

depends which 638 diode your using

im using a single mode 638 and with these optima lens i get a beam of 1mm x 1.5mm @ 0.5mR

people are obsessed with 300mw of 638 diodes, im not.

[steve-o]

I believe that the reason that people are "obsessed" with the new higher power 635-638 diodes is that there will be less of them to align for a given power vs a nightmarish number of them to keep aligned for the same power. Single mode vs multimode doesn't matter too much if you can tame the beam to a respectable Gaussian profile. imho.

[planters]

Yes. This is exactly right. If power output is unimportant and so the presumption is that all I am willing to focus and align and replace is say 4 diodes, then a high quality beam out of the collimator makes sense. You also get to avoid the secondary correction optics. But if power does matter then the number of diodes needed with the single mode choice quickly mounts. I believe a single P73 might equal the output of 5 of the single mode diodes. To each his own, but considering the combined cost of mounts, lenses, drivers and mirrors this will also be a lot cheaper.

[LaNeK779]

apart from the LOCs and the opnext 63133 / 6385, these lenses perform really well with 445 diodes, too

[danielbriggs]

apart from the LOCs and the opnext 63133 / 6385, these lenses perform really well with 445 diodes, too

I don't suppose you know off the top of your head what the near field beam is with a vanilla 445nm diode and the Optima do you Sir?
Has anyone seen a coating or transmission curve (circa blue wavelengths) for this?

[LaNeK779]

it is very very (very) similar to the 405-g-2 and the losses are not bad at all, despite the different design wavelength. i;m talking something like 1-2% worse than the 405-g-2 or something of that sort

[LaNeK779]

aah! here it is
http://www.photonlexicon.com/forums/...715#post221715
http://www.photonlexicon.com/forums/...785#post221785

these are very similar to my own findings.
but i do have the habit of keeping very detailed notes on small pieces of paper which i later permanently misplace or blow my nose on (or worse), so i don;t have my own measurements at hand. sorry


edit aw crap.. i double posted....