my lasers

Let me introduce my lasors
PICS HEAVY
They are fully hand made piece by piece.
Cabintets made by 1.6mm FR4 material.Lightweight but strong.
Dustproof optical deck AR windows from EO(2 x2")
Each of them include the S4 boards .
Laser drivers are reverse engineered LSP Dual drivers(sorry Dave)
TEC cooled laser diodes with temperature regulation(circuit by me)


2x 4W RGB
-dual PBS'd P73 with OPT lasers 6X cyl correction
-NDG7475 with techhood cyl correction
-M462 with techhood cyl correction
-PT20k galvo system
-200 x 150 x 150 mm without bracket
Output R/G/B : 1.3W / 0.8W / 1.3W


8W RGB
-quad P73 OPT Lasers 6X correction (a huge thanks for Jordi "Atenlaser" for his help! )
-dual NDG7475 with techhood cyl correction
-dual M462 with techhood cyl correction
-PT30k galvo system (with DT40 big mirrors from Rob)
-300 x 200 x 1600 mm without bracket
Output R/G/B: 2.6W / 1.8W / 3.2W


Powers measured by LaserBEE


PBS,Rotators ,Dichros and bounce mirrors from Rob.
FL2 lenses for quad P73 from HB-Laser, G2 lenses from Techhood
Laser Diodes are from DTR + Techhood

Apart from a bit of cable tidying inside they look great.

How do you attach the fibreglass sheets to each other, bonding or do you have corner blocks?

Awesome work Epyn!

Great to see builds again, missed it to be honest here on PL *warn*retardo

Quote:

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Originally Posted by White-Light

Apart from a bit of cable tidying inside they look great.

How do you attach the fibreglass sheets to each other, bonding or do you have corner blocks?

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Yeah,i have not skill in cable managment.
I'm using PCB so it is copper laminated and soldered to each other :)
Attachment 55184

Is there another set of optics before the scanners to down-collimate the beam diameter? Because the beams look really wide on the optical table (especially the red), but the output looks much smaller. Is it just some blooming in the camera maybe?

Nice looking units though! I've never heard of anyone using a copper plated PCB as a projector housing and then soldering them together. That's quite clever!

Adam

Oh,there is no achromats or telescopic optics before scanner.
Red is quite wide indeed a bit more than 5 x 5 mm but almost fits on the mirrors . Hence the loss is big as well. Have to get a scanner with bigger mirrors.
G/B are tight less than 4 x 4 mm and have nice divergence of ~0.6 mRad (with techood cyl lenses + G2)

The smaller lasers i have the beams are much tighter. Even the red. G/B in them have different techood CYL correction .
I found there is no point to have smaller beams, they are only hobby level lasers with acceptable divergence(very well divergence IMO).

nice work! I would have added a bit more green if I were you however to both projectors.

Very tidy and compact!

I love the soldered enclosure. What wattage iron did you use?

Quote:

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Originally Posted by masterpj

nice work! I would have added a bit more green if I were you however to both projectors.

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I have a few projectors with (1) M462 per (1) 1 watt 520 and I my opinion its about a perfect match.

Thanks,
I've been used to working with a 100 W soldering gun when need much heat.

Quote:

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Originally Posted by JRGixxerfreaK1

Awesome work Epyn!

Great to see builds again, missed it to be honest here on PL *warn*retardo

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Thank You Phillip.
As i'm not anymore on FB i miss our conversation also.
i'm always will be a PL member since my laser addiction is steady as rock.*warn:o

My next project.
8X NDG7475 (G2 )
Lasertack mounts+ right angle prisms
OPTLaser optics
Prism pair correction
DT-50B galvo
S4 panel , TEC cooled diodes.
I've measured the raw power of 4 diodes.
It's 2.5W @ 1A (panel meter reads 0.1010V means 1A )
I didn't go higher lack of the proper cooling and limit of my Laserbee.
Attachment 55491
Some pictures from the progress of build.

Looks good! How long did alignment take? My alignment efforts always take longer than I think it should . .

-David

Ditto....
I need a full weekend to align an RGB at least.
Sometimes i have to realign the optics because of the tense of the screws + other things . Warming and cool downs can do tricky things on this sensitive system.
Knok-knock i didn't have to realign for 4 months now.

I would like to ask many experienced laserists:
How much is the prism pair loss on 2X or 3X magnitudoes?
I've measured 25% on 2X and 38% on 3X
The prisms mounting template is from Lasertack (just like Zoof template)
Prisms are from Rob for 520 nm

I have never used a prism pair on the green diodes. I know on the P73 the losses are high due to the polarization. A waveplate before the prisms could help on the greens like it does on the reds. Worth a shot.

Quote:

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Originally Posted by epyn

I would like to ask many experienced laserists:
How much is the prism pair loss on 2X or 3X magnitudoes?
I've measured 25% on 2X and 38% on 3X
The prisms mounting template is from Lasertack (just like Zoof template)
Prisms are from Rob for 520 nm

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Hate to tell you....but your 25% and 38% optical power loss is typical when using a Prism Pair !!!
To reduce the beam astigmatism.... Drop the PP and go with a 6X set of Cylindrical Lenses....and suffer about 2~4% loss.

VERY nice build !!!!

CDBEAM

I hate to accept that loss is typical.

I know the advantages on CYL and my RGBs are corrected by them.

I'm working now horizontally stacked beams to get high power green so CYL can't be used.

Attachment 55529

Lightspace has the same template for their Green -and Blue as well- and using prisms.

Attachment 55530

Quote:

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Originally Posted by logsquared

I have never used a prism pair on the green diodes. I know on the P73 the losses are high due to the polarization. A waveplate before the prisms could help on the greens like it does on the reds. Worth a shot.

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I have the polarization rotator because of the PBS.
I don't measured the crossed beams on PBS(that doesn't requires rotator or WP) but i've already measured the raw beam without any optics .
Got high loss in any ways.
I think no optics help me out even a rotator/WP
Prisms are lossy.Have to accept.
With no any correction these NDG7475 diodes have incredible bad divergence so i sacrifice the power for benefit of quality.
Anyways it will be an 8W green. There is much power to loss from.

Well....I have had just GREAT results lately with coupling the NDG7475 with the new G8 Collimation lens from DTR. The 7475 starts out having a lower degree of astigmatism....than say the NUB044 or P73 LD....so... it needs somewhat less correction.

Now....this new lens is GREAT.....as it removes all Ghost Box artifacts from the 7475.....and....for whatever reason.....seems to somewhat correct the beam.

SO.....try this lens out !!!! Easy trial !! Low cost...Then....you MAY need less prism magnification....and therefore less power loss.

OR....although an added mechanical arrangement....take your entire Knife Edge assembly...rotate it 90 degree.....To do so... mount it on an Ally bracket ( Call this a.... Rotation Bracket ). In that way....you go from Horizontal stackage….to Vertical stackage...and then propagate into your Cyl. lenses in the working
orientation.

I would do the LD mount/Knife edge alignment procedure...with the Rotation Bracket unmounted from the main optical platform....so you are not working against gravity. Once the beams are at the optimal Beam/Beam/Beam/Beam alignment....then mount the Rotation Bracket.

Good luck,
CDBEAM

I give the shot for G-8 lens .
Thank you for the information!

Ferenc

Progress on my green laser
Installing 2x 24V PSUs for DT-50B scanner system
Ventilation system for proper cooling.
Some cable arrangments.
TECs get the final arragement. They will cool down 8 pcs of NDG7475 diodes with my temperature stabilization board.
The laser module cover. The module will be dust proof (EO 0.5" AR window) as well the whole optical deck (2" AR window)
The laser diode's PSU connected to S4 board 'mains' relay.

DT-50B has been ordered. Now i'm get some break. Waiting for scanner.....
Next and final step is the other LD bank.