We review recent work in which we developed a phase-matched model to study the transverse mode instability (TMI) in high-energy laser amplifiers. The standard models for TMI have contributions that vary rapidly compared to the beat period between the fundamental mode and the higher-order modes in the problem. In the phase-matched model, we neglect these rapidly varying contributions. We consider a realistic example with a Yb-doped fiber amplifier that is similar to the amplifier that was considered by Naderi et al. [Opt. Exp., 21(13), 16111 (2013)], but with a more realistic 10-m length. In this example, only one higher-order mode is present. We show that the computational speedup of the phase-matched model is on the order of 100 with no loss of accuracy even in the highly-saturated nonlinear regime.
Laser communications (Lasercomm) for long distance airborne applications offer the potential for secure, high capacity communications outside the traditional radio frequency (RF) spectrum. This paper will present laboratory and field experiments evaluating curvature adaptive optics for Lasercomm terminal architectures to enable long-range (<200 km) and high rate (10’s Gbps) communication links for airborne applications. In particular, the benefits of and requirements to implement higher order adaptive optics correction for airborne systems in addition to tip/tilt correction will be discussed.
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