574nm 36 mW Yellow Laser

[RedCowboy]

It's an 808nm pump is it not ?

1.53v sounds low, you would think current could be increased until you are see 1.8-2.2v

Or is that all the driver will put out ?

 

[paul1598419]

It's not an 808nm pump diode. In fact, the consensus is that it is a higher wavelength than that. It is the same driver. I have matched them out part for part. And 1.53 is the Vf of my diode at a 400 mA higher current than when I got it. Also, no matter what voltage I put into the driver, it never pulls anywhere close to 1 amp. Mine starts at 550 mA and after 90 seconds falls to 500 mA. If you are pulling a full amp, it is way over driven.

 

[Alaskan]

I saw earlier in the thread it wasn’t 808 so stands to reason, not going to go look again using my iphone at work, but saw some discussion being tossed about whether SHF or not, then someone chimed in why it couldn’t be that. Although the driver is pulling that amount, at this point, I don’t believe the diode is taking 1 amp from it, a lot being turned into heat.

 

[ultimatekaiser]

1.53, I don't see that low of a voltage for the shorter wavelength NIR laser diodes, so that matches the longer wavelength findings for the diode.

yeah. this gives us alot of information ironically. so yeah that probably is true it might be something a bit longer. might search through diodes later and see if I can find anything. I dont have one of these to test on unfortunately

 

[paul1598419]

Sure, a lot of that is waste heat. But, my point is, it shouldn't pull an amp at any input voltage under 12.5 volts. If it does, it is only because it is being severely over driven. You are not going to expect to get that much output power for the increase in current, but it is pulling far too much and a lot of that is going up as heat and your pump diode will be the worse for it.

 

[diachi]

Sure, a lot of that is waste heat. But, my point is, it shouldn't pull an amp at any input voltage under 12.5 volts. If it does, it is only because it is being severely over driven. You are not going to expect to get that much output power for the increase in current, but it is pulling far too much and a lot of that is going up as heat and your pump diode will be the worse for it.

Are the drivers all the same? Do they all have the switching regulator? If not and they're purely linear they'll pull the same current regardless of input voltage.

 

[paul1598419]

The drivers are the SAME! SAME drivers. Yes. They have both used the exact SAME driver. And mine pulls about the same current at any voltage. I can also increase or decrease it with the pot.

 

[deadshadow]

i just ordered one of each 565 and 575nm from alibaba with a better shippment price for both of them,i hope that they will arrive soon for some testing.

btw this driver looks like linear which is used alot from chinese lasers.if it was a buck it should draw much less than 500ma at 12v to convert it to 1,5-2v

 

[ultimatekaiser]

The drivers are the SAME! SAME drivers. Yes. They have both used the exact SAME driver. And mine pulls about the same current at any voltage. I can also increase or decrease it with the pot.

time to bust out the oscilloscope?

In all seriousness it makes me wanna put this on my lab-grade driver.

 

[Skittles]

You don't say which unit you ordered. I ordered two of the Oplaser units from Alibaba on May 25th. Got notification on Mon June 4th my order was being prepared to ship.

Got a text on Tues the 5th that they were in transit and would arrive by Weds the 8th by 8pm.

They actually showed up about 3pm!

I have only just powered both units up to make sure they work, and they do!

Very, very nice yellow!!!

I ordered the 575nm from the Alibaba seller, he has replied to me so I think everything is good so far...

 

[Alaskan]

I just don’t have time to measure the diode current, maybe Sunday, but when I increase to 12 VDC, the current drawn by the driver goes way down.

 

[RedCowboy]

i just ordered one of each 565 and 575nm from alibaba with a better shippment price for both of them,i hope that they will arrive soon for some testing.

btw this driver looks like linear which is used alot from chinese lasers.if it was a buck it should draw much less than 500ma at 12v to convert it to 1,5-2v

Do you have a link to that 575nm at alibaba ?

I would love to buy some, I can't find it in a search as yet.

I have found this only :

565&575nm laser specs
Output power 45-55mW will peak at 60mW
Wavelength 565nm or 575nm available
Beam diameter 3-4mm at aperture
Beam divergence 1.3-1.4mRad
Fan cooled
Modulation TTL but Analog available on request
Laser type DPSS
33*33*50mm H*W*L
AUSTRALIAN STOCK

For price and more info please email
sales@laserlandaustralia.com
or
+61421227361


-------------------------------

I just don’t have time to measure the diode current, maybe Sunday, but when I increase to 12 VDC, the current drawn by the driver goes way down.

If you are measuring at the input then yes, the higher your input voltage the lower the current draw will be with a switching driver for a given load, the efficiency might not stay exactly the same across it's range, but basically watts is watts. So if the numbers don't add up, or come close ( volts x amps ) then you will know when the voltage is too low and the driver is out of regulation/below cutoff

The drivers like it that I see on ebay do say 12v and yellow DPSS is known to be very inefficient, the driver they matched to the head may not be up to the task but works when under driven ? The spec I saw says 45-55mw with peaks at 60mw

 

[deadshadow]

Do you have a link to that 575nm at alibaba ?

I would love to buy some, I can't find it in a search as yet.

actually he doesen't have a listing i just messaged him and asked if he has 2 different wavelength lasers at 565 and 575 and he said yes but informed me that will be both around 20mw,i don't mind that so we had a deal.

 

[RedCowboy]

I sent an email to sales@laserlandaustralia.com

When I get one I will measure the current going into the pump diode with an inductive meter, are there any specs as to what voltage the driver is meant to operate at ?

I had expected to see these for sale on ebay by now, it may be they are having issues, 20mw is less than the original spec.......I will see what they say is available from LLAustralia


---edit---

OP said the device draws 6W, is that to the driver or the head? Driver input I suspect. Still the driver seems it may be overloaded. < Obvious statement yes I know.

 

[paul1598419]

Yep, it draws 6 watts to the driver. That was based on 500 mA at 12 volts. That is where mine settles after 90 seconds of working time. It seems to stay there after warm up. I did increase the diode current by 400 mA after heat sinking the output transistor and driver IC.

 

[RedCowboy]

I received a message from LLAustralia, they are out of stock but expecting samples, prices will be 50-75usd before shipping, maybe they will be upgraded ??