Search results

Is the goal to ultimately have a 3" aperture? If so, here is how I would do it.... I would use 4-6mm collimator lenses(g2 is fine). I would "stack" the beams like so ----. Not knife, as that would look like this llll. (it really the same thing, just with the diode turned 90deg). Next I...

Thank you for your help No prob. when you say do the correction individually, you mean a cylinder lens pair for each diode output? Yes, exactly. You could also use an individual spherical BE on each to get a large output beam with low divergence. When you say the gaps can be reduced by...

The best way I've found to knife MM diodes is to do the correction individually on each diode. This allows the beams to be converged at a distant point. If you knife first then go to a beam expander you will have large gaps between the beams. The gaps can be reduced by having the beams exit...

14um is the slow axis. The fast axis is much smaller, around 1um.

I believe the are both approx 14um wide.

The Fast Axis is actually the smaller dimension of the emitter. So, for the M140 the ~14um dimension is the wider dimension and the Slow Axis. The height is much smaller... around 1 or 2 um. The emitter dimensions can't be calculated from the raw divergence numbers. A known lens is needed to...

Same as the m140 diodes. ~14um.

This is the equation I use to get a rough idea: Emitter size in (mm) = divergence(radians) X focal length of lens (mm) The divergence is as measured after the collimation lens. M140 diode for example: .0036rad X 4mm = .0144mm (14.4um)

Unfortunately light can't be "trapped" in this way. The "waveguide" approach can't work because the beam(s) entering the side(s) will never reach TIR due to refraction as it enters the glass.

Bump. Anyone? DTR?

check this thread. http://laserpointerforums.com/f45/ndg4216-95106-3.html#post1381100

Got my diode today from DTR. Got a chance to do some quick tests. I used the green coat 3E lens from DTR. EDIT: added china G2 Threshold was at 70mA mA---- mW 3E---- mw G2---- nm 70------ 3.7------ 3.5------...

Awesome. Looks the same as the 7475. Looks like a really good value for a watt of green.

My bad! I just assumed when the word "beam" and "divergence" was used it was referencing the the typical spread of the beam in a device. Like the beam emitted from a laser pointer. But you are correct the raw "data sheet" divergence is what (plus the lens) determines the size and aspect ratio...

The spec sheet raw divergence numbers have very little to do with the divergence of the beam after collimation. Its the size of the emitting area(for some dumb reason its not listed on most spec sheets).

That would be great. To my knowledge the 7875 and 7475 have nearly the same size emitters.

I just went and measured my 7475's with a G2. At 25 feet I am seeing 29mm. Could be a bit less as its really bright. I also checked my notes and I was seeing 3.6mrad with a G2. This was measured at over 100 feet. Comparing my measurement to taters it looks like the nug is about 15% more...

I not sure if the labeling is correct on that image from DTR. If you click the link it says about 30mm at 25 feet with G2. 30mm is what I get with my 7475's with a G2. Makes for about 3.8mrad. It would be great to get a side by side of both the nug and ndg.

That seems very close to a 7475 with the same lenses.

This image is correct. This is true before the beam hits a collimation lens. Here is what is happening... The emitter of the diode is being imaged after the collimation lens at a distance. So, after collimation, you basically see a projected image of the laser emitter on the wall. For MM...