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  1. jors

    Laser vs. lamp. I've never heard a sensible answer to this. Help!

    Its about size of emitting point as well, Laser diodes have a very very small emitting point. Without taking other considerations (coherent etc) this is also the reason spot will be smaller when focused than with other light sources. You can't get so small emitter with that huge amount of...
  2. jors

    Research Group Using Blue Diode Lasers to Fight COVID-19

    Yes, ok, but these bluray diodes are multimode. Even if you get stable WL this is not a narrow band so I don't expect any coherent emission with SHG. Maybe 1-2mW of UV if lucky for a 1,5W 405nm? So if you need cooling control for just couple mW UV (or maybe nothing) I can't see the benefits for...
  3. jors

    Research Group Using Blue Diode Lasers to Fight COVID-19

    Why not 450nm for SHG? But I can't imagine how you could get SHG phase matching from a M2>5 MM blue TO Can diode. Moreover peak WL is going to change depending of current and temp, but also, from one diode to another.
  4. jors

    successfully lase Pr YLF crystal

    nice! did you measured 640nm power output? efficiency? thanks, great work!
  5. jors

    New! Sharp Diodes 1W 520nm & 5W 455nm & +2W 638nm

    Too big NF...
  6. jors

    New! Sharp Diodes 1W 520nm & 5W 455nm & +2W 638nm

    I purchased 2 units 638nm TO-5 1,2W FAC Square spot. Not useful for me. I can sell at lower price. PM if interested. Thanks!
  7. jors

    Fun with NUBM44

    Is that a NUBM44 with a can? So did you removed G-BALL and a added a can?
  8. jors

    Red Gball coming soon

    It seems this divergence is measured after Gball lens. Otherwise have no sense for me. It could be great to know divergence before Gball to compare with G84. I purchased one G84 (dual beam) direct from mitsu to test, and divergence from each beam is worse than even NUBM44. So maybe for pointer...
  9. jors

    FS: My new 635nm 900mW - diode two pins

    and what collimator? dot will be about the same if 3elem on red (say p73) and G2 on blue. Is that the trick? Nice host btw
  10. jors

    Super small YAG laser cavity

    Side or End pump with a 808nm diode
  11. jors

    Hello everybody

    Hey! this is the place! Welcome
  12. jors

    Adjusting Current With Multimeter?

    Yep, right. However dummy load is not exactly the same load than a Laser diode. So this is not 100% accurate, but yes, maybe the better approach. There are some drivers with current balance resistor on the output. On this drivers, Another way is to measure voltage falling across this resistor...
  13. jors

    Adjusting Current With Multimeter?

    or measure current on the dc input. Reading is almost the same.
  14. jors

    Hello again......pic heavy

    woooow! what an awesome work! High tech art. A pleasure for my eyes, thanks for sharing!!
  15. jors

    Knife-edging four NUBM44 in Lasertack micro module

    Agree. Thanks for the drawing. On side-to-side diode setup this is (as I know) the only way to get the same divergence/beam size each beam. A single cyl set is possible but beam length path for each diode must be the same when reaching the 1st CV. Because all we know distance from cyls affects...
  16. jors

    The Cyan Cannon Vll Build

    This is why I go with achromatics doublets/triplets positive lenses on my RGB SF, to minimise focal shift because of refractive index. They work pretty good..of course lenses must be high quality.
  17. jors

    The Cyan Cannon Vll Build

    I've been done lots of SF with combined wavelengths on my modules and yes, it clips 638 (if required) but also cleans both wavelengths, granted (you have to get a perfect NF/FF alignment first). You must go with achromatic lenses and find which aperture diameter better suits your needs (usually...
  18. jors

    The Cyan Cannon Vll Build

    It is possible to get a solid yellow on multimode diodes with a pair of PBSed P73 and one 700mW or 1W 520 green Nichia. You have to expand green until about 3mm to get 1mrad (better with cyls), and about 5mm for combined red to get 1mrad as well (cyls again). Accurate NF-FF beam measuring is...
  19. jors

    The Cyan Cannon Vll Build

    Great!! go go CDBeam! clap-clap-clap