Abstract
We present the design of an ultrafast optical parametric chirped pulse amplifier (OPCPA) operating at 3 µm yielding few-cycle pulses and multi-mJ output energy. This design demonstrates that with a configuration of a single crystal or combination of crystals (KTA and MgO:LN) it is possible to achieve output energies above the mJ with sufficient bandwidth to allow compression to just 5-optical cycles. Here, we consider a 1 µm mJ-level picosecond chirped pulse amplifier (CPA), a typical pumping source for this type of non-linear amplifiers. Compression with a simple bulk material enables reaching close to the pulse Fourier-transform limited duration, paving the way to high energy, ultrafast mid-infrared pulses.
Highlights
We propose the individual and combined use of two non-linear crystals, potassium titanyle arsenate (KTA) and magnesium oxide doped lithium niobate (MgO:LiNbO3, MgO:LN), as an ultrabroadband mechanism for the optical parametric amplification of 3 μm pulses from the μJ up to the mJ-level pumped by 1 μm sources
The simpler configuration that allows achieving the mJ-level consists in a single-stage, KTA-based optical parametric chirped pulse amplifier (OPCPA) pumped at 63.8 GW/cm2
We show that up to 5 mJ, 5-cycle pulses can be achieved by a single stage configuration, either collinear or non-collinear, with reduced demand on the compression scheme
Summary
Citation: Alves, J.; Pires, H.; João, C.P.; Figueira, G. Multi-mJ Scaling of5-Optical Cycle, 3 μm OPCPA.Photonics 2021, 8, 503. https://doi.org/10.3390/photonics8110503Received: 15 October 2021Accepted: 4 November 2021Published: 9 November 2021Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland.Attribution (CC BY) license (https://creativecommons.org/licenses/by/
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