[Laser] medium power IR diode

[Andrew T. Flowers, K0SM]

Hi folks
I was looking around at laser diodes the other day and I came across a 
120mw IR (784nm) diode made by Sharp:
http://rocky.digikey.com/WebLib/Sharp/Web%20Data/GH078JA2C.pdf

I was thinking of getting one or two and building a constant current 
source to drive it about halfway between Ith and Iop.   This should keep 
it from blowing up when I take it to a mountain in January.  Anyone know 
how I might go about collimating this thing?   Would I need to find some 
way of cooling it?   Digikey is selling them for $20, which seems to be 
a good value in terms of $/mw.  If I can get it going it would probably 
be ideal for cloudbounce/troposcatter experiments with Silicon-based PIN 
photodiode.
Ideas??

Andy
K0SM