Optimal design of ultrahigh-energy laser amplifier chain with high storage energy extraction

Abstract

This paper presents the concept of constant-fluence amplification. It refers to the fact that laser fluence anywhere in the amplifier gain medium is identical to the design fluence E(design), which represents the maximum allowed fluence in consideration of the laser-induced damage threshold (LIDT). Based on this concept, we explore ideal amplifier model (IAM) and near-ideal amplifier chain (NIAC) and propose an optimal NIAC design method and analytically offer an indicator of the extraction efficiency. Finally, the paper discusses the influences of losses on the NIAC's extraction efficiency.

24 mJ Cr+4:forsterite four-stage master-oscillator power-amplifier laser system for high resolution mid-infrared spectroscopy

“…However, the efficiency can be significantly enhanced if stage and passage number increase simultaneously. 8 A step in this direction is the implementation of a four-stage amplifier with the two-pass configuration each to increase the extraction efficiency and the output energy. 6 In this work, we report a SF Cr:forsterite four-stage MOPA laser system with two-pass per stage which delivers up to 24 mJ, starting from a relatively low energy of the oscillator and without significantly affecting the beam parameters.…”