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It is for small scale periodic heating for a research project. Good idea on checking the output after the driver, I will do that. I checked the photodiode rise time and it is 1ns, so it should be able to keep up. I will also look at using the pwm signal on the laser power instead of the...

I am trying to see if the diode can modulate up to 100kHz. Using the ATmega PWM pins directly (https://www.arduino.cc/en/Tutorial/SecretsOfArduinoPWM) I know the arduino can output a 50% duty cycle square wave at 100kHz, I have checked the output on a o-scope as well. Here is an image of the...

This data sheet mentions an RF Oscillator https://media.digikey.com/pdf/Data%20Sheets/Atmel%20PDFs/ATR0885_Summary.pdf It says "An on-chip, low-EMI RF oscillator is available to reduce laser mode hopping noise". What does this mean? I have a phr-803t optical head from an xbox DVD player and...

Thanks for the response. To clarify, what determines the output voltage? How would I predict it or should I just use a multimeter? Thanks!

Hello, first post here. I'm not very knowledgeable in electrical engineering and haven't been able to clarify my understanding of a constant current driver. I have set up a typical constant current source with an LM317 and can set it to output the current I want. The circuit I followed uses a...