Until recently, fiber amplifiers were limited to relatively low peak power levels. Now, aeroGAIN rod fibers bridges and overlaps the fiber world with the DPSS crystalline rod based world. The non-coilable aeroGAIN rod fibers represents the ultimate fiber performance with a range of unique features: MW peak power handling No thermal lensing High single pass gain Guidance of signal and pump High beam quality Excellent beam pointing Free space coupling Polarization maintaining High efficiency (~ 70%) High pump acceptance angle (NA > 0.6) Polarization independent pump absorption The aeroGAIN rod fibers are typically used within three main applitions for pulsed laser systems: Output amplifier stage in fiber amplifier chains Intracavity Q-switched configuration Replacing Nd:YAG, Nd:YLF and Nd:YVO4 laser crystals