I can't answer your diode questions but I can steer you towards some possible drivers for the project. there is a man in Europe who makes somewhat expensive 5A drivers, but since you need 10 that won't work unless you parallel a pair of them. I had to build a 30 amp adjustable constant current power supply for a large RGB array and I just paralleled several drivers together (12 of them), isolating each ones output with a diode and put the outputs together on one common copper bar. Since they were each current limiting and each set to the same current, no one driver would pull more than a few amps, each staying within their maximum designed output rating. It worked perfectly.
I have read reports on this forum where others have done the same thing with smaller drivers, just paralleled them together but not all drivers will function properly that way, best to isolate the output of each driver with a diode between where they both join together and each drivers negative output, this will prevent the possibility of an unfriendly interaction between the two from damaging them, depending upon their design. Of course, this will require two isolating diodes, one for each driver you are joining the outputs together from, if using two. For the positive side of each driver, since that won't be the hot side for your application, they can be joined together without a diode.
To give you some other ideas, I once built a 50 amp current regulated PWM driver for a 45 watt output FAP808 laser, well, six of them in series, by using an inexpensive HHO PWM module you can get on ebay too, here's a link to one which might be something you can use:
http://www.ebay.com/itm/Constant-Cu...526?pt=LH_DefaultDomain_0&hash=item233c99b08e - To get this to work for your use, you could string some power diodes in series with its output to get the voltage down to what you need for your laser diode. For my project I was using an auto battery with it and with the laser diodes themselves in series to drop the voltage down so no one laser diode received more than 2.1 VDC. This kept each of them within their individual voltage rating while using PWM to control the current.
I wired it together and played around with it for an hour but then never went any further with the project, boxed it all up and they are now sitting in storage. Whether PWM was a good way to go with these FAP bar units as far as specifications go I don't know, but I turned the frequency down to the lowest setting I could for the pulses and it worked. Long term, I don't know how PWM would have affected the devices.
Here's a link to the 5 amp driver I mentioned above:
http://www.ebay.com/itm/Laser-diode...537?pt=LH_DefaultDomain_0&hash=item35db838a01 - I think two of these in parallel, each isolated by a diode from one another would be a much easier way to go, if you don't need PWM.
this will probably be what I'll do.