<!DOCTYPE html><html><head>
<style type="text/css">body { font-family:'Times New Roman'; font-size:13px}</style>
</head>
<body><div>You can find cheaper lasers with good beam quality, but if you have a laser which can't be controlled from uManager, your sample will be illuminated all the time, also during moving or timelapse waiting periods. For some samples this will be a problem.</div><div><br></div><div>However, if that's acceptable for you, in the first version of my setup I was able to make a cheap diode laser work by focusing it onto a small pinhole. It's a similar solution to the fiber one, but somewhat cheaper. However, whether you use pinhole or fiber, you'll need a very precise XY positioner for effective coupling which is also not cheap (I was using a borrowed one).</div><div><br></div><div>Regards,</div><div>Monika Pawłowska</div><div><br></div><div>W dniu .02.2018 o 08:40 Emmanuel DUFOUR <quelleordure@gmail.com> pisze:<br></div><br><blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px solid; padding-left: 1ex"><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></div>
</blockquote><br><br><br><div id="M2Signature"><div>-- </div><div>Monika Pawłowska<br>Nencki Institute<br>Laboratory of Neurobiology<br>3, Pasteur Street<br>02-093 Warsaw, Poland<br>phone: (+48) 22 5892 382</div></div></body></html>