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Old 09-06-2017, 10:08 PM #33
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Default Re: Driver Specifications Compendium

Quote:
Originally Posted by kastymizilian View Post
Dear All,

First of all, super cool forum, lots of useful info. Im new here - building my first laser and digging for clues so please be merciful on my stupid questions

Im reading through glued posts regarding drivers and have very simple (i hope question)

Why different drivers are described as appropriate for certain laser diode wavelength type? Is it only about providing proper Vout and Io? or is there something more? My knowledge of electrical engineering is poor so I need simple explanation.

Welcome to LPF, you should create a thread in the welcome section to introduce yourself.

Different wavelength diodes have different voltage drops, so you need a driver capable of supplying an appropriate voltage. You also need a driver capable of supplying an appropriate current, some can only supply too much, others can't supply enough.

Laser diode drivers are constant current, meaning they always output the same current and adjust the voltage as necessary to meet that setting.


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Old 09-06-2017, 10:17 PM #34
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Default Re: Driver Specifications Compendium

OK, thanks, so in the end its about supplying appropriate voltage and current and drivers they are rated for different wavelengths just because that - is that correct?
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Old 09-09-2017, 12:14 AM #35
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Default Re: Driver Specifications Compendium

Drivers don't "know" what wavelength the diode is producing. They are constant current devices that are set to run at a certain current rated in mili-amps, or for higher powers, amps. When picking out a driver, however, you must be sure it is capable of supplying enough forward voltage to turn the laser diode on. There are many different types of drivers. Linear, Bucking, Boost, Sepic. Each has its strengths and weaknesses. If this concept is confusing to you, I suggest you search for laser diode drivers and try to learn about each kind. To build a laser pointer, though, you don't NEED to know all this because we have members like DTR who will sell you the laser diode, driver set to the correct current and pressed into a module with a collimating lens. All you need to do is find a suitable host and connect two wires to the contact board, or pill, and secure the module in the heat sink.

See this link: https://sites.google.com/site/dtrlpf/home
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Last edited by paul1598419; 09-09-2017 at 12:15 AM.
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Old 09-13-2017, 03:28 AM #36
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Default Re: Driver Specifications Compendium

Quote:
Originally Posted by paul1598419 View Post
Drivers don't "know" what wavelength the diode is producing. They are constant current devices that are set to run at a certain current rated in mili-amps, or for higher powers, amps. When picking out a driver, however, you must be sure it is capable of supplying enough forward voltage to turn the laser diode on.
Drivers being constant current I understand. As a welder I utilize both constant current and constant voltage welding machines for different welding processes. As a newcomer the question did peak my interest and I look forward to someday demystifying the care and feeding of different wavelength diodes.

Quote:
Originally Posted by paul1598419 View Post
There are many different types of drivers. Linear, Bucking, Boost, Sepic. Each has its strengths and weaknesses.
Sticky waiting to happen
On edit: existing sticky discovered and read...

Quote:
Originally Posted by paul1598419 View Post
To build a laser pointer, though, you don't NEED to know all this because we have members like DTR who will sell you the laser diode, driver set to the correct current and pressed into a module with a collimating lens. All you need to do is find a suitable host and connect two wires to the contact board, or pill, and secure the module in the heat sink.

See this link: https://sites.google.com/site/dtrlpf/home
And it is Greatly appreciated! I have a question emailed to DTR awaiting a response (probably playing catch up after vacation) about one of his modules that brought me to this thread.

The OSRAM PL520, I don't know what driver is on this module-

https://sites.google.com/site/dtrlpf...nm-laser-diode
But I assume it would be prudent to know it's specs to help decide what battery to use to run it for desired run time and duty cycle. If it isn't among those listed here and anyone knows it would be a helpful addition.

Last edited by Jon Richard; 09-16-2017 at 08:05 AM.
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Old 09-13-2017, 04:22 AM #37
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Default Re: Driver Specifications Compendium

I pair the PL520's with a Nano buck/boost. If going battery powered use a single Li-Ion. It will run unlimited duty cycle if your heatsink for the module can support it.
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Old 09-13-2017, 05:37 AM #38
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Default Re: Driver Specifications Compendium

Quote:
Originally Posted by DTR View Post
I pair the PL520's with a Nano buck/boost. If going battery powered use a single Li-Ion. It will run unlimited duty cycle if your heatsink for the module can support it.
I wondered if the nano buck/boost might be it but I thought "nah, the lowest setting is listed at 275mA", I was hoping for less juice but I can cope with it.

The only reason I haven't hit the buy button yet is I was hoping you could sell me a 120* fan angle cross spot pattern glass lens for it also (fingers crossed thinking the answer is no)
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Old 09-13-2017, 05:47 AM #39
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Default Re: Driver Specifications Compendium

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I wondered if the nano buck/boost might be it but I thought "nah, the lowest setting is listed at 275mA", I was hoping for less juice but I can cope with it.
No, that's the Nano Boost driver that has the 275 mA low end. The buck/boost driver has a pot and can be adjusted while the Nano Boost has resistors you solder bridge across.
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532nm 189mW pocket lab laser
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Old 09-13-2017, 05:57 AM #40
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Default Re: Driver Specifications Compendium

Quote:
Originally Posted by paul1598419 View Post
No, that's the Nano Boost driver that has the 275 mA low end. The buck/boost driver has a pot and can be adjusted while the Nano Boost has resistors you solder bridge across.
Well, I guess that means I have the option to go hotter and brighter, and if lasers are anything like hotrodding there's no doubt I eventually will.

Won't that end up around 130mW as is?

Last edited by Jon Richard; 09-13-2017 at 06:06 AM. Reason: Added remarks, Android emotions deleted- failed to emote
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