Red Oclaro 700mW Dimmed @ 1.25A boost

[r4mn33k]

Hi, I bought 2 Oclaro 700mW diodes off ebay
I put them in a 1.25A boost driver host. Both the times I made them (2 diff lasers) both times the laser turns on bright but then dims to very low.
I dont know what I am doing wrong, I purchased JAD kit from well known member, so all I can go wrong is in either the diode pressing, or soldering leads.
I am putting in a single 3.7V battery 18650 I believe.
Any help would be appreciated.

Thanks.

 

[Nexgen]

Why boost driver? Oclaro voltage is around 2V... I think 1.25A is far overdrive. You should use buck driver for red diodes.

Most likely diode is dead already

 

[deadshadow]

exactly what Nexgen said,if you are using a boost driver on this diode probably you fried either diode or driver or both,this is a very low vf diode and you need a buck driver to power it. if your diodes are still alive i suggest to lower the current around 1A as those diodes are not that robust on overdriving

 

[r4mn33k]

oh now I understand, since both the diodes get really dim I guess diodes are gone. I was under the impression for red lasers a boost driver is needed, this is my first time making red lasers. Now since my diodes are done, Can I run a m140 on 1.25A boost? I usually use regular non-boost for m140 and the 9mm diodes

 

[diachi]

oh now I understand, since both the diodes get really dim I guess diodes are gone. I was under the impression for red lasers a boost driver is needed, this is my first time making red lasers. Now since my diodes are done, Can I run a m140 on 1.25A boost? I usually use regular non-boost for m140 and the 9mm diodes

Buck/Boost depends on what voltage your diode needs and what supply voltage you're using. If your diode voltage is higher than your supply voltage you need a boost driver. If your diode voltage is lower than your supply voltage you need a buck driver.

 

[waffailtrager101]

If you need some of the data on the Oclaro 700mW diode here it is:

Wavelength: 638nm typical @700mW
Output power: 700mW *
Current :900mA typical @700mW
Threshold current :200-250mA *
Working voltage :2.3 V typical @700mW
Package: TO-18 5.6mm
Working temperature: -10 to +40 degrees Celsius *
Storage temperature: -40 to +85 degrees Celsius *
Working life: more than 10,000 hours*

I got this info off of Laserlands where I recently purchased the same diode. I hope this helps

 

[r4mn33k]

If you need some of the data on the Oclaro 700mW diode here it is:

Wavelength: 638nm typical @700mW
Output power: 700mW *
Current :900mA typical @700mW
Threshold current :200-250mA *
Working voltage :2.3 V typical @700mW
Package: TO-18 5.6mm
Working temperature: -10 to +40 degrees Celsius *
Storage temperature: -40 to +85 degrees Celsius *
Working life: more than 10,000 hours*

I got this info off of Laserlands where I recently purchased the same diode. I hope this helps

Thanks guys, I came back to making lasers after 2years and dug up my old supplies I had.

Since you bought same diode, mind sharing which driver you are using? since the boost provides higher voltage, would you use a buck driver with 2 3.7V batteries?

 

[diachi]

since the boost provides higher voltage, would you use a buck driver with 2 3.7V batteries?

Yes.

Character limit...

 

[r4mn33k]

Yes.

Character limit...

I mean I use that for all the blue ones I make, but I may be wrong, but a couple years ago someone told me that red lasers should be running on 1 battery, not 2, thats what made me buy the boost driver. I have been looking around, and now I see that I can run both 2W blue m140 and the Oclaro 700mW using buck driver, 2 3.7V batteries, but only difference is the Amps, I need to run the red at much lower amps.

 

[paul1598419]

Red diodes can be run with one battery in a buck driver, but you can also use two. With a buck driver you need the supply voltage to be around 1.5 volts higher than the Vf. It can be much higher than that, but not lower than ~1.5 volts above Vf.

 

[Bacon]

That sucks. If its any help, I used a BlackBuck driver with my Oclaro 700. It can take an input of 7-12v