Higher power DPSS Lasers need larger crystals, most assuredly. They also require much larger pump diodes and precise alignment as when you get into the higher end of the power curve with DPSS you have to consider that composite crystals don't exist. Once you start dabbling in professional level...
Ok, I am launching a startup Company which amongst other things, will be providing both (a) Bare Modules and (b) Laboratory Quality, Narrow Linewidth, 'Drever-Pound-Hall' Stablised (ie. Temperature, Frequency, etc. modulated) Laser Modules for Diode Lasers.
I'm aiming to try and bring them in...