My green 532 Lasever 150mW is like Frankenstein...

[ElektroFreak]

You DO need a diode with a FAC lens for that laser. Make sure that any replacement you consider clearly states either that it has FAC or fast-axis collimation. If you refer back to the picture I posted in post #14 on the previous page you can see that an integrated FAC lens is nothing more than a piece of fiber-optic fiber glued across the face of the diode (you can see it at the top of the diode). The cylindrical cross-section of the fiber acts as a cylinder lens which collimates the fast-axis.

[JimBo]

You DO need a diode with a FAC lens for that laser. Make sure that any replacement you consider clearly states either that it has FAC or fast-axis collimation. If you refer back to the picture I posted in post #14 on the previous page you can see that an integrated FAC lens is nothing more than a piece of fiber-optic fiber glued across the face of the diode (you can see it at the top of the diode). The cylindrical cross-section of the fiber acts as a cylinder lens which collimates the fast-axis.

I can't see any photo in post #14

Jim

[ElektroFreak]

Weird.. I'm not sure what's up with that.. Here's a direct link.

[JimBo]

Weird.. I'm not sure what's up with that.. Here's a direct link.

I just get a blank page for that too ?????

Jim

[hobbybob]

Me too, but since i became a member of lpf yesterday i can login and then access Elektrofreaks page:
http://laserpointerforums.com/member...fac1-zoomed-3/

But.... on my CURRENT diode there is NO such strand of glued fiberoptic in front of the diode. But since i believe in Elektrofreaks expertise i will order one WITH a FAC lens.

Just out of curiosity, what will happen if i order one without, will the diode spread it's light in the "cup" it's housed in, or will it still direct all the light upwards, through the small hole and through all optics ?

[JimBo]

Not 100% sure, but without the FAC the beam from the diode will still be pretty tight in such a short distance, so I would think it would be OK.
I'm no expert on C blocks though.

Jim

[ledfreak3d]

ahh yes thats a standard 808nm cmount with fast axiz lens
u can get those prety cheap of ebay.
just be sure u get one with a fac lens

in case u are wondering its that very small glas fiber infront of the chip on the cmount
u can hardly see it with the naked eye

woops to late somebody explained already

[ElektroFreak]

Me too, but since i became a member of lpf yesterday i can login and then access Elektrofreaks page:
http://laserpointerforums.com/member...fac1-zoomed-3/

But.... on my CURRENT diode there is NO such strand of glued fiberoptic in front of the diode. But since i believe in Elektrofreaks expertise i will order one WITH a FAC lens.

Just out of curiosity, what will happen if i order one without, will the diode spread it's light in the "cup" it's housed in, or will it still direct all the light upwards, through the small hole and through all optics ?

Are you 100% sure that that diode does not have FAC? I can see that it does in your pics.. Look VERY closely, perhaps with a magnifying glass..

[JimBo]

I've had to register at LPF to see the images, it now shows up in post #14 too.

Looking at that image is the "fibre" glued ALONG the top of the block, ie, side ways on the full width of the block, just protruding past the left hand side?
I was expecting to see it edge on, ie, the fibre sticking out the front of the mount.

I've replaced one in a blue and a green and I can't recal seeing the fibre on either of them.

Jim

[ElektroFreak]

Sorry about the image problems, I dodn't take into account the fact that you have to be a member of LPF to view my images there. I relocated the image to my album here on PL..

I can clearly see in the pics that hobbybobs diode also has a FAC lens like this.

A FAC lens of this type will only work if the beam passes perpendicularly through the cross section of the fiber. The cylindrical shape of the fiber causes it to act like a cylinder lens.