DTR's Laser Shop: Diodes-Drivers-Lenses-LEDs & More

[DTR]

Nichia NDG 700mW 520nm Laser Diode


They look just like the 1W version.




With the same off center pins.




Here it is. The little brother to the 1W 520nm Diode. Pretty much the same as the 1W version other than slightly less powerful and a lower pricetag. I won't bother with a picture of the output as it looks identical to the 1W version. I was not given the datasheet but maybe someone resourceful can dig it up like we did for the 1W version. The supplier is trying to avoid a big to do like there was when the 1W ones were leaked. Apparently they have been available all along but it was the 1W ones that originally escaped into the wild. It is a 1.4A rated diode and averages about 850mW there and a little higher if pushed. Also I am sure when TEC cooled it would produce a significant bump in output. Anyway here is the testing.

























Did a quick run pushing to 1.8A to show the stability of the diode.




There you are. I grabbed a bunch of them but I am not sure of the future availability on these.

[absolom7691]

Ask and ye shall receive. Thanks, Jordan! I may be picking one of these up soon.

[Photonbeam]

Is there a Lasorb for green?

[DTR]

Yea if you mean the 700mW and 1W ones you would just use the same one you would for the 445's since the forward voltage and current demands are close to the same.

[DTR]

Here is an interesting DLP breakdown. What we have is a laser/LED hybrid projector using a red, blue and green high power LED and two I would say without further testing 200mW 405nm diodes.

Seems to me the diodes were an after thought just so they could say it is a Laser/LED projector as I have no idea what 200-400mW of 405nm would do to help a projector.

Anyway here is the full breakdown.

[-bart-]

No sign of any phosphor wheel ?

Could they be used for some kind of auto-focus mechanism ? Unlikely because of the manual focus wheels.

Probably too late to measure the in vivo working voltage / current of the laser diodes ?

[DTR]

It seems to me this sketchy company just put them in there to say it is a laser hybrid. They clearly lied when asked they said:
"Thank you for your reply.
The laser projector LS1280 has two laser diodes, one blue laser diodes 10W, one green laser diodes 40W. I can only tell you that much. This is product technology, company has a rule we can not reveal too much. Hope you will understand and do not mind it."

They also keep saying it only has two LED's when it clearly has three.
"We used the 1 laser+2LED Light in our item.
About the lumens,we use the RGB lumens,but your test maybe white lumens.
Pls consider the final effect when you use.And we need our customer's feedback to encourage us to make prefect.Also I think Americans are friendly.
Indeed, creativity usually requires a willingness to be open to novelty and innovation.We will make our best to bring the best laser projector for our customers.

Hope you can understand us,and try to use it well."


Seems they picked the cheapest diodes they could find which are PHR style 405nm diodes. Tested and confirmed. The diodes have no collomating lens so the output is completely spread and they are pointed at a vertical dicro. Most all the light of the diodes are just hitting the wall of the housing.
As you can see here there are no lenses in these mounts.
Either in the picture the vendor sent.


or what I found when taking it apart



Here is a picture from the top of the dicro under the 405nm diodes. They do have two small pin sized reflective surfaces on top but that could only be catching a very small fraction of the light as it sits a measured 15mm away fromt he top of the can of the diode.



And here it is from a side view. Cut off some of the housing so you can get a better view. When powered most all the light just hits the bottom of the housing.

[-bart-]

They must have some kind of functionality, otherwise it is too bizarre!
There must be cheaper ways to incorporate placebo- lazors into a projector, IR lasers are much cheaper than UV.
The custom dichro probably costs more than the laserdiodes.

The laser pcb has 4 wires coming from it, yet the traces on the pcb suggest that the diodes are wired parallel, are the wires paired?

[Crazy]

I must have missed a few of those pics on LPF, I didn't realize how craptacular the construction is!

[DTR]

They must have some kind of functionality, otherwise it is too bizarre!
There must be cheaper ways to incorporate placebo- lazors into a projector, IR lasers are much cheaper than UV.
The custom dichro probably costs more than the laserdiodes.

The laser pcb has 4 wires coming from it, yet the traces on the pcb suggest that the diodes are wired parallel, are the wires paired?

Yea if they used UV diodes it would be hard to claim they offered anything to the light engine however I can't see what 200mW 405nm if it was even collecting the power from the diodes would do for it. Either way I am pretty sure this is not what what you would think of with a laser/led hybrid projector. Compare 200mW of 405nm to 24-50W of 445nm other projectors of that classification are getting from their laser source.
Well that comparison seems to have poor results in the relative brightness calculator.
http://lsrtools.1apps.com/relativebr...&useRaleigh=on


Yea it does look like they are wired in parallel. Maybe two wires for each terminal to help carry the massive current.