High power single crystal KTA optical parametric amplifier for efficient 1.4–3.5 µm mid-IR radiation generation

• Published in: Laser physics Vol. 34; no. 7; pp. 75401 - 75408
• Main Authors: Csanaková, Bianka, Novák, Ondřej, Roškot, Lukáš, Mužík, Jiří, Smrž, Martin, Jelínková, Helena, Mocek, Tomáš
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2024
• Subjects: high power laser; KTA; mid-infrared; nonlinear optics; optical parametric amplification; picosecond; ultrashort pulses
• ISSN: 1054-660X; 1555-6611
• DOI: 10.1088/1555-6611/ad45db

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 µ 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-infrared power was 17 W at the 2060 nm wavelength degeneracy point.