A back biased photodiode such as Thorlabs DET-10A works wonders in this time regime. You'll need a 50 ohm terminator on your scope if it does not have a internal 50 Ohm setting. 1 ns is good, as it lets you see any ringing/missing pulse issues with the Q-switch etc.
The Thorlabs FDS010 low area photodiode (1 ns rise time) would be fine if you reverse bias it, and its 1/2 the cost of a DET-10.
You simply need a silicon photodiode with a very, very, small area and about 9-12 volts of reverse bias.
You don't need to put the PD in the beam, you have lots of light, the scatter from a beam terminator should be more then enough.
I could dig and find something cheap at Digikey, however it is best that you get a screened device with a known risetime.
Steve
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When I still could have...