Index-leveling for forced-flow turbulent face-cooling of laser amplifiers

TL;DR

This paper introduces an index-leveling technique that uses thermo-optical null points to mitigate turbulence effects in forced-flow face-cooling of laser amplifiers, enabling higher power laser operation.

Contribution

It presents a novel optical method to control flow turbulence effects in laser cooling, enhancing high-power laser performance.

Findings

Mitigates optical distortions caused by hydrodynamic instabilities.

Enables weakly turbulent flow regimes at high flow rates.

Potential to increase laser power scalability.

Abstract

Direct laser slab face-cooling by a fluid crossing the main and pump laser beams is an important method to reach high average laser powers. However, the flow regime is usually maintained at low Reynolds numbers, to prevent the onset of turbulence features in the flow, that would degrade wavefront quality. We show here how bringing the fluid temperature to the thermo-optical null point, close to the water/ice transition in the case of water, allows one to mitigate the optical consequences of hydrodynamic instabilities, by bleaching optically the temperature inhomogeneities within the flow. This optical process, dubbed 'index-leveling', opens the door to a highly efficient forced-flow, weakly turbulent face-cooling regime that should be instrumental to boost the kilowatt capabilities of next generation high-power lasers.