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Laser Retrofit Light Bar

The clear/neutral mirrors on the live laser systems page are broadband coated 400-700nm ( should be dielectric ) and the colorful prism reflectors are dichroic with a tighter range for R/G/B knife edging.
 





RedCowboy said:
The same diodes, YES, works very well, all the N1h1a arrays are strings in series.

You can also get decent efficiency with a simple linear regulator with many diodes in series, I was running all of these off of a single lm338 configured as a current limiter.
If your laser diode needs 2A @ 5V and you have 10 laser diodes in parallel, then you need 20A @ 5V.
But in series you need 50V @ 2A for the 10 diodes.
It's actually safer to run in series because inconsistencies could cause 1 diode to draw more than another if in parallel, but in series that's not an issue.

sany4787-jpg.68989


RedCowboy

Thread 'Multiple beams'

Sheltering in place and being somewhat bored I bought a used projector for cheap with 2300 hours and harvested 24 x M-140 diodes that work very well, I am driving 4 laser diodes in series @ 1.6a using a LM338 as a current regulator using 0.8 ohms across the adj. and output pins and 8 x 18650 in series,.....my expideted mounts are angle brackets giving me X and Y adjustment so I can converge the beams where ever I want to.........thinking about what else I can do with all of these diodes.......maybe knife edge a bunch ? Anyway just goofing around and thought I would post a couple of...
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Absolutely! Laser diodes are current devices through and through!
 
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The single mode reds in the 630's range are nice for pointers.
 
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Fiddy said:
Ive got 3 G2 lenses and 3E glass in at the moment, just alliging the multimode planes so they are all the same.

The diodes im using are USHIO HL63193MG
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Yes I saw, they are 700mW powered even with just 1 32650 6A cell or a smaller one!
Driver 1A - Max 1.2A , the colour isn't pure red , but a red-orange, do you confirm?
 
SĤ𝕒∂όⓦŁ𝔸ŜєR said:
Yes I saw, they are 700mW powered even with just 1 32650 6A cell or a smaller one!
Driver 1A - Max 1.2A , the colour isn't pure red , but a red-orange, do you confirm?
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Im using a 120Ah 14.5V lead acid.
set current at 800mA for good life, It looks red.
The 2.5W mitsubishis should be here soon got a big block of alloy to mount em in.
GOBBLESS
 
Fiddy said:
Im using a 120Ah 14.5V lead acid.
set current at 800mA for good life, It looks red.
The 2.5W mitsubishis should be here soon got a big block of alloy to mount em in.
GOBBLESS
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We hope they arrive soon! I also have a battery with the pole + and pole - from 2nd it is small and rectangular I think it is mine too, but I have been sold separately the charged charger [220V] with the two mouth -mounts of the crocodile mouth
 
Update,
Put some of the ML562G84 tripple beam diodes into copper modules and run them on the bench.
With a small heatsink they ate CW current like a champ, upto 2.4A didnt want to push them super far, fair bit of light with 4 going at once.
Next i have to machine up a peice of 50x25x260mm solid alluminium as the heat sink, it fits nicely into the light bar, should be a very large thermal mass for 4 lasers running at once.
 
Fiddy said:
Update,
Put some of the ML562G84 tripple beam diodes into copper modules and run them on the bench.
With a small heatsink they ate CW current like a champ, upto 2.4A didnt want to push them super far, fair bit of light with 4 going at once.
Next i have to machine up a peice of 50x25x260mm solid alluminium as the heat sink, it fits nicely into the light bar, should be a very large thermal mass for 4 lasers running at once.
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Wouldn't it be better in copper?
 
RedCowboy said:
You can knife edge beams and yes your front surface mirrors need to be kept clean, otherwise they will rob power, but better yet is to use dielectric coated reflectors and again keep them free from dust/smoke contamination.

Prism Mirror

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Each diode will get an equal division of the voltage, so @ 50V each of 10 diodes will get 5V when in series, that's provided the necessary current is there to flow 5V each.

Remember laser diodes need current regulation to prevent runaway as they warm up, always regulate the current.

So for our 10 diodes in series, if the driver has 50V available and the current is limited to 2A at which 5V ( example NDB7875 ) will flow through each diode, then each diode will only get 5V..... however if you limited the current to say 1.25A then each diode would only flow the voltage needed, say 4.35V each even though 50V was available.
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This is wrong. Series diodes will have a common current, but the voltage will vary among the diodes. This is the opposite of what you would expect from parallel diodes. Actually, this applies to all components either in series or parallel.
 
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