The seed laser amplifier system 1550 may include, e.g., a seed laser portion 1530, e.g., a solid state seed laser such as a Nd:YAG or a Nd:YLF or a Ti:Sapphire or a fiber laser or other solid state laser, or an excimer or molecular fluorine gas discharge seed laser, e.g., operating at around 12 kHz with a 1-2 mJ output energy pulse and a pair of amplifier portions 1532, each being supplied with, e