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Old 12-16-2014, 05:44 AM #1
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Default Youtube video shows what a expander can do for your 445nm laser

If you want to see what a beam expander can do for your higher divergence 445nm laser, watch this to the end



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Old 12-16-2014, 05:59 AM #2
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Default Re: Youtube video shows what a expander can do for your 445nm laser

thanks for sharing. though I think someone can better demonstrate the difference. I can personally attest that with a 10X expander I made a NDB7A75 seem like single mode, albiet with a 1.5 inch wide beam, give or take. it's quite a feat considering the terrible divergence of that diode. some focusable lasers like the one I have/had can allow you to clip less of or none of the beam on the expander's sides by defocusing the laser. to fit that narrower waist in the BE's input. Mine is adjustable. you can greatly reduce artifacts as well.

only drawback is power loss, hence the interest in lasers that enter the diode's raw output directly into an expander setup, rather than through a regular lens then an expander. less optical losses
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Old 12-16-2014, 07:17 AM #3
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Default Re: Youtube video shows what a expander can do for your 445nm laser

Yes, the video could have been done better, but I haven't found one yet. I've found that you don't need an expander lens if you take the raw output from a laser diode and place a PCX lens at the appropriate distance in front of it, according to the FL. That way, you reduce from three lenses, down to just one, compared to putting a regular beam expander in front of a collimated laser.
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To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

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.........................
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