Hi.
5mW green dot laser modules not surviving 5 minutes on.
Even 'industrial' lasers are meant for 45 seconds on - 15 seconds off, as in

----> https://www.ebay.com/itm/3pcs-INDUS...559507&hash=item33e8b8acf7:g:hpoAAOSw--Fa4UBI

I do not need more than 5mW optical, but 12 hour on, 12 hour off for at least 1 year, in that small package. Suggestions ?

And: its control electronics is supposed to limit current/power and compensate for batteries getting lower; so what is the real expectation for power supply ? Does it have to be 3.000 V or can 4.2 to 2.4V make them work reliably ?

 

They need a constant current driver.

Bob

 

Isn't its circuitry constant current drivers ? If not, what is their circuitry for ?

 

Sorry, I didn’t look at the link. Yes, that probably is a constant current driver, which means changing the input voltage woll have no effect.

Bob

 

Does it have to be 3.000 V or can 4.2 to 2.4V make them work reliably ?

Says 3.0-3.7V working voltage(supply)

 

Thanks.
Yes. but Chinese lie too much. Having spring contacts, the 'industrial' ones on link look more like for pointer/pen; for 2x AAA. Which would be under 3.0 V after a minute, and thus then, stop working. So that is obviously a misleading 'spec' invented by sales people.
Infrared laser diodes for DPSSL are supposed to work down to Vf around 1.8-2.2V = spent 2xAA cells...

 

Thanks.
Yes. but Chinese lie too much. Having spring contacts, the 'industrial' ones on link look more like for pointer/pen; for 2x AAA. Which would be under 3.0 V after a minute, and thus then, stop working. So that is obviously a misleading 'spec' invented by sales people.
Infrared laser diodes for DPSSL are supposed to work down to Vf around 1.8-2.2V = spent 2xAA cells...

Good luck with your assumptions and stereotyping..
Maybe intended for a 3.6V lithium battery...

What supply voltage were you using?

 

18650 cell.

 

I'm on Externet's side: Asian spec sheets are rife with errors.
The most common I see is using peak current / short duration retold as constant current.
An occasional oversight is one thing, this is pervasive fraud.

 

I'm on Externet's side: Asian spec sheets are rife with errors.
The most common I see is using peak current / short duration retold as constant current.
An occasional oversight is one thing, this is pervasive fraud.

Don't take my responses as falling on or taking the "Asian" side..
If you don't know by now that when you purchase that stuff that all bets are off then I really feel bad for you..
"fool me once, fool me twice" saying..

 

There are two types of green laser modules. Using an infrared laser and a nonlinear optical converter. Such modules can work from 2.5 volts. But there are modules with a true green laser. The operating voltage of such lasers can reach 8 Volts. The Chinese solved this problem using a stabilizer on a charge pump. But the minimum supply voltage is 3 Volts. I solved this problem using a DC / DC boost converter with an output voltage of 5 volts. But maybe 3.3 volts too. The fee for this turned out to be quite small.