Re: 1W 405 source

Posted by Zdenek Svindrych-2 on
URL: http://confocal-microscopy-list.275.s1.nabble.com/1W-405-source-tp7591310p7591323.html

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Hi Antonio,

We used to buy from Dragon lasers (China) many years back, now CNI Laser
(again China) seems like a great source (no commercial interest).

If you want to go super cheap, you can search eBay for laser engraving
modules, some are 405 nm (but mostly 445 nm), you want something like "7W"
at least, as it's the electric input power... And don't stare into the beam
with your remaining eye!

Andor uses a fiber shaker to homogenize the beam (and critical
illumination, like their Borealis technology) for their Mosaic DMD devices,
but I can't guarantee the amount of light you can couple into a 50 um or
100 um fiber from the eBay laser modules...

UV LEDs sound cool, but the problem is the coupling efficiency (etendue).
If your source is a 1 mm^2 LED chip, you can illuminate 1 mm^2 with a 1 NA
objective lens with good efficiency (if you try hard). If you try to focus
the light down to 0.3 mm^2, 90% of the light is lost... And higher power
(more LED chips) won't help you get more light trough, only the optics may
be simpler... Of course on top of that another 99% of light is blocked if
you only have few DMD pixels "on"...

I've seen papers where folks bolted a DMD digital projector to a
microscope. Lie this one:
https://drive.google.com/file/d/1IEfgKvZ0JrCUaaUPdnRFhUzT3phJO-D-/

Best, zdenek

On Mon, Sep 21, 2020 at 10:11 AM Antonio Jose Pereira <
[hidden email]> wrote:

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> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Dear all,
>
> I'm looking for a 0.5-1W , 405nm, can have many spatial as well as
> longitudinal modes, 405nm laser. This is to feed a photoconversion module
> (Mosaic), a DMD-based system that wastes most power. That's why we need
> such high power source.
>
> I appreciate if you could give suggestions on low-budget options, which
> I'm failing to find ...
>
> Thank you so much,
> Antonio
>
>
>
> Antonio Pereira
> CID lab
> i3S/IBMC, Universidade do Porto
> Room 001.S2B, [phone] Ext. 6127
>

--
--
Zdenek Svindrych, Ph.D.
Research Scientist - Microscopy Imaging Specialist
Department of Biochemistry and Cell Biology
Geisel School of Medicine at Dartmouth