Help Tuning A flexmod

[MisterWilling]

I am about to make use of an oscilloscope we have here at my work. I am going to tune my soundcard DAC with it. I have found a guide on how to do this, but while I'm tuning the DAC I would like to go ahead and tune my flexmods also.
It says in the manual that you should tune with an oscilloscope if you desire faster modulation (http://hacylon.case.edu/ebay/laser_d...2%20Manual.pdf). The other lasers I'm going to be using are 20k analog modulation so do I even need to tune my flexmods or should they work as is at this speed modulation? If I do need to tune how would I go about doing that?


http://hacylon.case.edu/ebay/laser_d...2%20Manual.pdf

[FourDee]

Feed them a square wave of the desired max operating frequency.
Measure the output current via the voltage over the sense resistor.
Adjust the speed so that the rise time is as small as possible without having overshoot ...

[drlava]

FourDee is correct, for tuning as fast as possible. However if the other lasers you are using are 20k, you're going to just want to gently turn the speed pot all the way counter-clockwise because 20k is slow! When you tune FlexMods 200-300k blanking rates are acheiveable, but it won't do you any good with the other lasers at 20k.

[MisterWilling]

Oh okay, thanks for the info. Hopefully one day I'll have lasers that I need to tune for speeds of 300K :-)

[buffo]

Oh okay, thanks for the info. Hopefully one day I'll have lasers that I need to tune for speeds of 300K :-)

I'd like to have SCANNERS that could tune to 300K!

Adam