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Old 07-29-2010, 02:46 AM #17
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Default Re: 445nm Firefly

This laser has a very fast axis and slow axis. It will always emit a "stripe" rather than a DOT or Gaussian type beam. 2 ways to correct this, anamorphic prism pair, or perfect cylinder lens mounted below focusing lens to slow down fast axis (LONG PART OF BEAM)
This is a problem for bar lasers too which emit the laser from a very, very fast axis or multiple facets. They usually couple with cylinder or glass ball lens.. So, yes, there are ways, but most people are just happy to get the beam out of it. The slow and fast axis are actually called parallel and perpendicular axis, it would show on a datasheet if we could ever find for sure who makes the diode for Casio.


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Old 07-29-2010, 02:49 AM #18
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Default Re: 445nm Firefly

This may be the wrong focal length lens in housing, the diode may be dying or being optically clipped by the small aperture.
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Old 07-29-2010, 08:18 AM #19
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Default Re: 445nm Firefly

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Originally Posted by RDTech View Post
This may be the wrong focal length lens in housing, the diode may be dying or being optically clipped by the small aperture.
I think you're right about wrong focal lens,

why do you say the diode may be dying? i use microboost set at ~750mA
and turn on my laser diode.
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Old 07-29-2010, 09:03 AM #20
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Default Re: 445nm Firefly

Laser diodes project an odd "tire track" shaped beam when they are damaged. It would look like a stripe along the fast axis of the laser diodes pattern on a wall with or without the lens at 10-20', less without lens.

I'm not sure where you obtained that housing. I also not sure how the laser diode is centrally mounted in the housing. Just my 2 cents
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Old 07-29-2010, 09:11 AM #21
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Default Re: 445nm Firefly

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Originally Posted by RDTech View Post
Laser diodes project an odd "tire track" shaped beam when they are damaged. It would look like a stripe along the fast axis of the laser diodes pattern on a wall with or without the lens at 10-20', less without lens.

I'm not sure where you obtained that housing. I also not sure how the laser diode is centrally mounted in the housing. Just my 2 cents
You can find in this thread all, see http://cjoint.........
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Old 07-29-2010, 01:52 PM #22
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Default Re: 445nm Firefly

Dead Link my friend
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Old 07-29-2010, 01:58 PM #23
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Default Re: 445nm Firefly

Ouups
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Old 07-29-2010, 02:21 PM #24
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Default Re: 445nm Firefly

It looks like th beam is being clipped by the lens aperture. Most of the 445nm lasers I have, the fast axis is longer than the one in your photo. Where did you get that housing? Doesn't look like enough heat dissipation for this type diode...
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Old 07-29-2010, 02:37 PM #25
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Default Re: 445nm Firefly

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It looks like th beam is being clipped by the lens aperture. Most of the 445nm lasers I have, the fast axis is longer than the one in your photo. Where did you get that housing? Doesn't look like enough heat dissipation for this type diode...
i purchased the module with glass lens G1 here in April
http://cgi.ebay.com/445nm-405nm-Lase...item5888d7cd63

and here the real heatsink full brass L 2.6cm X Diam 3.2cm
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Old 07-29-2010, 02:52 PM #26
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Default Re: 445nm Firefly

OK, fair enough...Call / e-mail the seller and ask him if this is the beam profile he would expect from the module/heat sink/lens combo you purchased. Most people on this forum are using Aixiz parts with little or no problem, or th ey are making them themselves. It sounds like a big enough heat sink, just not sure of the front focal length and lens aperture.
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Old 07-29-2010, 03:04 PM #27
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Default Re: 445nm Firefly

Sometimes those brass housings don't have threads that allow the lens to get reaaally close to the diode. It appears there's a substantial (relatively) gap between the diode and the lens in your photos.

In Aixiz modules, the diode actually sticks out of the inside area bit bit, allowing the lens to fit in really close to the diode. It may be that the 445nm diode needs that in order to properly focus.

The laser will also never have a reaaally clean dot. It'll always look like a bar, and there's a focus range where you can get it relatively small, but never a really nice spot like other lasers.
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Old 07-29-2010, 03:29 PM #28
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Default Re: 445nm Firefly

Yup, I agree. Still unless a small cylinder lens is used right over the laser facet (with can opened, patented btw), it is hard to get a square beam which when focused will look KIND OF ROUND..

Company I had done some work with. See information on their "uLens"
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Old 07-29-2010, 03:36 PM #29
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Default Re: 445nm Firefly

if i screw or unscrew it the actual blue square disappears
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Old 07-29-2010, 03:41 PM #30
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Default Re: 445nm Firefly

Get an AIXIZ module on eBay and use it. I do not know about the machining of this module you are using. There is a front and back focal length.. Unsure of what lens was used and it's characteristics. I do not know if anyone else has had these problems. AIXIZ is cheap and made relatively well.
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Old 07-30-2010, 08:36 PM #31
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Default Re: 445nm Firefly

That ebay seller you bought it from is a member here on the forums, laser66. He has been selling laser supply stuff since before ebay even existed. I'm sure he can help you out

Just pm him
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Old 07-30-2010, 08:45 PM #32
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Default Re: 445nm Firefly

Also that assembly you bought came with the G2 lens. It should have no problems with collimating the output.
One of the things to remember about the g1 and g2 lens. Is that they need to be very close to the diode, to do their best.

Strange, even when the g1 is not as close as it should be. I have never seen it produce a big square like in in your pictures. Have you tried reversing it, flipping the lens around??
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