TTL modulation and rise time

[SimonApers]

dear all,

for the calibration of a photomultiplier tube, I am using a roithner STAR405F5 violet diode laser (http://www.roithner-laser.com/datasheets/lasermodules/405/star405f5.pdf).
I want it turned on for a minimal time. I know the TTL modulation has to be below 300kHz, leading to a pulse time of above 1.66 microseconds.

However I am wondering if this is really the lower limit? I can understand that this might be the limit for periodic modulation but if I just want to pulse it once, can't I do this for a shorter time?

I guess this is set by the turn-on time of the laser, this however I cannot find anywhere. Any clues on that?

thanks in advance!
simon

 

[Sigurthr]

That's likely the limit of the driver and not the diode (as diodes can be modulated well into the MHz range).


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[SimonApers]

ok thank you for the quick response sigurthr.

So do you think that if I want to single pulse it, it might be possible to get shorter pulses? If so, any thoughts on the pulse time limit?

thanks
simon

 

[Sigurthr]

You'd likely need to eliminate the built in driver; and at that point you might as well just DIY a constant current source and one-shot and your pick of cheap diode to get your single short pulse.


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[Mark Twain]

In this paper we explore the dierences between modulation modes and pulsed modes of laser diode modules and theresulting performance of the lasers. While some applications only require a laser diode to be run in continuous wave (CW)mode, some applications require the laser diode to either be pulsed or modulated.

 

[SimonApers]

Could you give me the name of the paper?