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Hello everyone! Ok I have a question I simply have been unable to answer using my google-fu. I am a electronics engineer but I am just now branching out into lasers above a class 2. Here is my question. I have a M140 diode with a G2 lens coming in shortly. I am using a custom constant source driver that uses a SDcard and a actual programming file where I can control specifically how may mA I can drive to the M140. My voltage source is 7.5-7.75 volts depending on battery charge. And I can push up to 2A on my primary channel.
I have a potential input of up to basically 15W but I'm trying to figure out how to calculate the out put of the M140. I have found many sights with loads of data. Looking at thermal variance and in put to out put seams leaner around 25-30deg C. Everywhere I read says that the M140 is not a voltage dependent device, and hooking it up straight to a power source would cause thermal runaway and kill it. I also know that I should stay under 1.8A. And my threshold value should be around 140ma (the G2) might lower this, I am unclear on this, according to the limited info I could find online.
My question is, is there a way to get a rough calculation on out put vs input with out a actual measuring device. Using good old math. I keep running into conflicting data and this is why I am posting here. This seems to be the best resource on the net for Laser hobbyist.
The board has the capability of switching between 1-3 files each file I can set to a different mA level. So does the input voltage affect the out put of the M140 in calculations because if so. P=AxV so the get 2w theoretically I only need around .250mA but I feel like I am missing some crucial information on how to figure out what I want to know. Any help would be appreciated.
I have a potential input of up to basically 15W but I'm trying to figure out how to calculate the out put of the M140. I have found many sights with loads of data. Looking at thermal variance and in put to out put seams leaner around 25-30deg C. Everywhere I read says that the M140 is not a voltage dependent device, and hooking it up straight to a power source would cause thermal runaway and kill it. I also know that I should stay under 1.8A. And my threshold value should be around 140ma (the G2) might lower this, I am unclear on this, according to the limited info I could find online.
My question is, is there a way to get a rough calculation on out put vs input with out a actual measuring device. Using good old math. I keep running into conflicting data and this is why I am posting here. This seems to be the best resource on the net for Laser hobbyist.
The board has the capability of switching between 1-3 files each file I can set to a different mA level. So does the input voltage affect the out put of the M140 in calculations because if so. P=AxV so the get 2w theoretically I only need around .250mA but I feel like I am missing some crucial information on how to figure out what I want to know. Any help would be appreciated.