High power single crystal KTA optical parametric amplifier for efficient 1.4-3.5 $\mu$m mid-IR radiation generation

TL;DR

This paper demonstrates a high-power, tunable, single-crystal KTA optical parametric amplifier pumped by a 1030 nm laser, achieving significant mid-IR power output for efficient 1.4-3.5 μm radiation generation.

Contribution

It introduces a novel high-power, tunable KTA-based optical parametric amplifier with record mid-IR power outputs and high conversion efficiency.

Findings

Maximum signal power of 8.9 W at 1750 nm

Maximum idler power of 6.2 W at 2500 nm

Achieved 17 W combined mid-IR power at 2060 nm

Abstract

In this paper, we present a single crystal, KTA (potassium titanyl-arsenate, KTiOAsO$_4$) based picosecond optical parametric amplifier pumped by an in-house built 1030 nm Yb:YAG thin-disk laser, capable of tunability from 1.46 to 3.5 $\mu$m, operating at 90 kHz, with high average power in the signal and idler beams. The highest output power of 8.9 W was reached for the 1750 nm signal beam with 19% conversion efficiency and the respective 2500 nm idler beam power was 6.2 W with 13% efficiency. The highest combined signal and idler mid-IR power was obtained at 17 W at the 2060 nm wavelength degeneracy point.