LPC-840 discussion thread

[CDBEAM777]

I have everything set up to run this test but I cannot find my goggles!!! Most of my stuff is packed away in boxes now so I will continue to tear through it. One of the downfalls of living between two places is that I cannot ever get fully settled in...

Hurry...I wanna see beam shots....with my Seeing Balls !!! MMMMmmmmm....

" OctaDragon "......

Eight pounds'a sh$t.....ina One pound sh$t bag.....YEA...........A little Optical Visual VooDoo.....Can do !!

8 x 500mW per head...= 4W....less optical loss...= 3.6Watts'o' CHERRY RED......Maybe !!! ( SWAG...with 10% optics loss).....:drool:

 

[The Lightning Stalker]

Show that diode who's boss, styro. Bleed it of its photons! op:

 

[IsaacT]

CDBEAM are you going to knife edge them? Every group of two joining through a PBS cube and then the 4 resultant beams get knife edged?

Or two sets of 4 knife edged beams get combined with PBS cube as the last step?

 

[styropyro]

Just finished the test! I'm not impressed with the results, I got 268mW @ 500mA using an AixiZ glass lens (AR coated for 650nm). Will post the full PIV data in a bit.

 

[styropyro]

I'm too lazy to make a nice graph, so here is the raw data.

I expected more from this diode, oh well.

 

[IsaacT]

Those are very dissapointing results indeed. Maybe I'll just stick with my LPC826's and my GGW reds. I'm sure I can think of a use for the two I have coming though.

 

[The Lightning Stalker]

Chart

These results are disappointing to say the least. Hopefully it was just a weak diode.

 

[IsaacT]

We would get more power with a single element acrylic lens.

 

[crazyspaz]

yikes, rated 390mw at 380ma, and it does 268mw at 500mw...Yea, lets hope that was a bad diode. Styro, do you have any others to test?

 

[Rifter]

Re: Chart

These results are disappointing to say the least. Hopefully it was just a weak diode.

This is disappointing to say the least.

 

[CDBEAM777]

Oh *&%$#@......maybe a bad apple.....odd that it does not achieve the rated metrics !!!......

 

[styropyro]

I have another diode so I'll test that one out in a bit. Hopefully it was just a bad one, open can diodes can be finicky.

 

[CDBEAM777]

CDBEAM are you going to knife edge them? Every group of two joining through a PBS cube and then the 4 resultant beams get knife edged?

Or two sets of 4 knife edged beams get combined with PBS cube as the last step?

Well.....since these LD are SOOoooo low cost......Might be 120USD for eight.....so....how to cram eight nice and tight beams.....into one beam...I have seen the result of this in a Kvant projector....it is done....and it is almost older technology !!!.....But....but we have no stinkin'optics to deal with to correct EACH beam....as we do with the G71/P73 offering....this MAY be a HH project....NOT a small unit...but....doable !!!

Just pack the LD's as close as possible.....use the flemounts to control the pitch/yaw translation.....and dump'em thru the telescope optics !!!! Just looking for a CHEAP solid 500mw out the front door...single emitter !!!....and hoping the LPC-840 would be just that !!!

Yes....650nm is NOT the luminosity of a 635nm.....but....what a beautiful Ruby Red at the 650 line !!!!!!

All we need is for a little overdrive of the LPC-840.....and decent slope efficiency...and this may be my next mountain to climb !!!

Really....the optimal arrangement when using telescope optics is to have as square of an array as possible......so....really....this would be nine (9) individual LD...stacked like

...
...
...

With the rows being closer together....so the final pattern of ALL the beams is a box !!

Again....can all THIS fit into a HH....Well....if ya have bigger hands !!! Hahahahaha !!!

See attached pic !!!!

 

[IsaacT]

I may see how high I can get one. One of these days I will break down and buy a power supply.

 

[bdgreenb]

Lol Isaac. I had my finally break down and buy a ps moment about 6 months ago. Received a broken one but got to keep it and got a full refund as well as a bunch of ICs and heat sinks out of it. I'm itching again. I'll keep you in the loop if I find a good one for a good price.

 

[CDBEAM777]

FYI...Telescope optics are just two lenses. See attached pic and diagram.

Typical arrangement... a long focal length convex or biconvex lens coupled with a short focal length convex or biconvex lens.

In the pic.... are 2 achromatic convex lenses, one with f=120mm the other with f=30mm.

That's the VooooDoooooo !!!! Projector stuff...yea....be may be applicable to a HH...YES....HOW BIG ???? If I understand correctly....the distance between lenses = 120mm + 30mm = 150mm = about 6"

May be able to shorten this....a little....but....remember those pesky and bothersome "Laws of Physics/Optics" !!!!

Likely, another member has a more formal and superior education in this area !! Please correct if I am in TOooo deep !!! Thanx !!!

Update....info from Laser_man....Using a combination of NT47-348 and NT47-911from Edmonds will deliver a beam at 5mm dia !! AND.........lens to lens distance looks like about 3"......Much better !!! See last added pic !!

Maybe an " Over and Under " concept.....like the Dragon's Head design will yield enough room for optics,LD's+ mirrors and power supply.....just somewhat larger in diameter than the DH ???? Could be a winner.....or not !!!!