Investigation of the characteristics of a three-pass amplifier utilizing a neodymium glass plate

An experimental investigation was made of the energy characteristics of a three-pass telescopic amplifier with an active element made of neodymium glass. A simplified model calculation was made of the process of amplification of a short laser pulse in such an amplifier forming a part of a complex optical system. The high output energy (300 J) and gain achieved experimentally demonstrated the usefulness of such amplifiers in the output stages of high-power laser systems.