Very fast (100+ MHz) LED or laser diode switching

[mixedgas]

If I can find them again, I have seen some papers on RF changing carrier lifetime in the diode and shortening the pulses, drastically.

Steve

[mixedgas]

I sent him the links to some papers.

If you do a little grating feedback and inject RF on a DC bias, many small diode lasers will modelock with very large peak powers at ~100-200 Mhz. I hope that works for him.

The peak powers can be enough that a ordinary 100-200 mW diode can start working with single pass doubling crystals.

Steve

[shrad]

Steve, would you mind transfering these links to me, if it is disclosable?

cheap modelocking at such frequencies could be interesting, and most cheap detectors would integrate at nanosecond scale, so it could be nice for spectroscopy

thanks a lot in advance

[MatthiasH]

Thanks for the links Steve. Almost sure mode locking won't help me here, since I'm looking for frequencies that can be sweeped over a wide range (10 - 120MHz), and a rectangle or sine (-ish) profile.

(Please excuse brevity: it's 6:24 am, diaper changing time :-))

[mixedgas]

So are we now at the point you just need a 20-30 watt RF Amp with 2 decades of bandwidth? Do you have access to a VNA to check the diode's impedance when conducting?

The other groups use the picosecond stuff I sent you...

Matt, you need to make a friend at IXYS Colorado. They used to sell IXLD02SI and now have a division that does high speed diode drivers.

(Shrad, Can do, pm me with a email)

Steve

[VDX]

Hi Steve,

pm-ed you too, but can't find the PM in the sent folder - did you receive something?

Viktor

[MatthiasH]

Steve,

Looking through the IXYS diode driver range, I only found devices capable of obscenely short pulses, but at a max 100kHz repetition rate. How close a friend would I have to make there - close enough she'd engineer something new for me?

Locating a VNA shouldn't be too hard around the EE department. I'll see if I can find one and measure the diode's impedance.

[mixedgas]

IXYS makes a lot of RF amps and other items not on the catalog.

Steve

[LPR]

Maybe this scheme will help you http://www.repairfaq.org/sam/laserdps.htm#dpsldd317