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<p>Hi, Emmanuel,</p>
<p>As far as I know, diode lasers always give a beam elongated in
one axis. I would consider coupling a diode laser to a single-mode
fiber, this will clean up all other modes except Gaussian
(TEM_00). The output of the fiber can be collimated into a
high-quality beam using an off-the-shelf collimator (Thorlabs
sells them, for example).</p>
<p>I hope this helps,</p>
<p>Nikita<br>
</p>
<br>
<div class="moz-cite-prefix">On 12/02/2018 08:40, Emmanuel DUFOUR
wrote:<br>
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cite="mid:CAKWGfdKsh0kcGUqjv0n6ycwdDWRvK4gPxTOSm3eQhYcFpHt3sA@mail.gmail.com">
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<div dir="ltr">Hello<br>
The laser parts listed in openSPIM are expensive (7000 euros).<br>
Is there a way to get cheaper lasers work ?<br>
I've been trying to make a very small focus point with a cheap
red laser diode without success. I often see several points
instead of one. And I cant make the point(s) smaller than 0.1 mm
.<br>
But I dont know if it's because of the cheap lenses I use, or
the aperture that is too big, or the diode itself (transverse
mode pattern ?).<br>
So, what are the bare requirements for the laser in order to
make it focus to a size of about 10 um ?<br>
<br>
Thanks for your help<br>
Emmanuel DUFOUR<br>
<br>
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<br>
<pre class="moz-signature" cols="72">--
Nikita Vladimirov, PhD
Preibisch Lab
Berlin Institute for Medical Systems Biology (BIMSB)
Max Delbrück Center for Molecular Medicine (MDC)
Robert-Rössle-Str. 10
Bld. 89, room 1.08
13125 Berlin
twitter.com/nvladimus
github.com/nvladimus</pre>
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