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Topic: Looking for an appropriate LASER diode driver (Read 135 times) previous topic - next topic

olafwillocx

Greetings.

I have a 1W 445nm LASER diode. It's rated for 4.3 to 4.6V and pulls around 1A of current. I can't seem to find a proper LASER driver for this diode. All the ones I come across seem to be rated for 5V. It's not supposed to be anything fancy. It just has to work. Not even for long periods of time. I can use 7.4V or 5V input voltage.

Any suggestions for a driver? Thanks.

DVDdoug

#1
Sep 12, 2017, 07:38 pm Last Edit: Sep 12, 2017, 07:40 pm by DVDdoug
LASER drivers are "tricky".   They use feedback from a "3rd pin" on the LASER diode to measure the light-output.  The "5V" driver might work if the feedback & power setting is correct because it will automatically-continuously adjust the voltage & current for the right amount of power (voltage & current). 

The safest thing is to buy a laser module with a built-in driver, or get the recommended driver from the LASER manufacturer/supplier.    That's especially true if the LASER needs to be pulsed or modulated because most drivers are designed for continuous output.   

Here is a web page all about LASERS & drivers.

Quote
I have a 1W 445nm LASER diode. It's rated for 4.3 to 4.6V and pulls around 1A of current
Hmmm....  Power is Voltage x Current, so that would be around 4.5 Watts.

allanhurst

#2
Sep 13, 2017, 12:16 am Last Edit: Sep 13, 2017, 12:17 am by allanhurst
Various manufacturers make these for high data rates over fibre optics.

see eg www.analog.com/en/products/optical/fiber-optic-data/laser-drivers.html

Data up to 11.3 GB/s !

pretty impressive

I've used them up to 3GHz.

Allan

olafwillocx

LASER drivers are "tricky".   They use feedback from a "3rd pin" on the LASER diode to measure the light-output.  The "5V" driver might work if the feedback & power setting is correct because it will automatically-continuously adjust the voltage & current for the right amount of power (voltage & current). 

The safest thing is to buy a laser module with a built-in driver, or get the recommended driver from the LASER manufacturer/supplier.    That's especially true if the LASER needs to be pulsed or modulated because most drivers are designed for continuous output.   

Here is a web page all about LASERS & drivers.
Hmmm....  Power is Voltage x Current, so that would be around 4.5 Watts.
1W of light, ~3.5W of heat I'd imagine.

MarkT

[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

olafwillocx

How about telling us which laser diode?
Sure. It's this one from ebay: http://www.ebay.com/itm/1W-1000mW-Laser-Diode-Blue-445nm-TO-18-5-6mm-/171922444978.

olafwillocx

I also asked the seller of the LASER diode for advice. She said a 5V one will work, but no more than 1.4A of current. That really opens up a lot of options. I will definitely be able to find one with these specifications. Keeping you updated in case there's any comment from someone here. I'll wait a bit. Thanks for the help so far.

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