Multi-mJ Scaling of 5-Optical Cycle, 3 µm OPCPA

Alves, Joana; Pires, Hugo; João, Celso P.; Figueira, Gonçalo

doi:10.3390/photonics8110503

Photonics

2021

DOI: 10.3390/photonics8110503

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Multi-mJ Scaling of 5-Optical Cycle, 3 µm OPCPA

Joana Alves

Hugo Pires

Celso P. João

et al.

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 t… Show more

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Mid-infrared quasi-parametric chirped-pulse amplification based on Sm:LGN crystals

Ding

Liu

et al. 2023

Opt. Express

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We numerically demonstrate highly efficient mid-infrared quasi-parametric chirped-pulse amplification (QPCPA) based on a recently developed Sm3+-doped La3Ga5.5Nb0.5O14 (Sm:LGN) crystal. At pump wavelength around 1 µm, the broadband absorption of Sm3+ on idler pulses can enable QPCPA for femtosecond signal pulses centered at 3.5 or 5 µm, with a conversion efficiency approaching the quantum limit. Due to suppression of back conversion, such mid-infrared QPCPA exhibits robustness against phase-mismatch and pump-intensity variation. The Sm:LGN-based QPCPA will provide an efficient approach for converting currently well-developed intense laser pulses at 1 µm to mid-infrared ultrashort pulses.

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Mid-infrared quasi-parametric chirped-pulse amplification based on Sm:LGN crystals

Ding

Liu

et al. 2023

Opt. Express

View full text Add to dashboard Cite

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Breakdown of the single-collision condition for soft x-ray high harmonic generation in noble gases

Chevreuil¹,

Brunner²,

Thumm

et al. 2022

Optica

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High harmonic generation (HHG) in atomic gases is generally assumed to originate from photoelectrons that are not perturbed by neighboring particles. In this paper, we study theoretically and experimentally the regime where this approximation breaks down. At high laser intensities, we experimentally find that producing soft x-rays beyond this single-collision condition leads to a strong reduction of the coherent HHG response and appearance of incoherent radiation. We generalize our results to phase-matched HHG with mid-infrared drivers, and determine that a minimum pulse energy is needed to simultaneously phase match the HHG process and keep photoelectrons unperturbed by surrounding particles. Therefore, while previous research showed that HHG efficiency is independent of the driving pulse energy if other experimental parameters are scaled accordingly, we find that this rule no longer applies for high photon energies. Our study thus provides important guidelines for the laser parameters needed for the generation of high flux soft x-ray high harmonics.

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Multidisciplinary Laser Facility Driven by New-Generation High-Repetition Laser

Vaz,

Alves,

Hariton

et al. 2024

Photonics

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For many years, high-power laser technology has been divided between industrial applications, which prioritize higher average powers and repetition rates, and academic research, which focuses on achieving higher peak powers and ultrashort pulse durations. The introduction of Yb-doped crystals in laser technology has paved the way for a new generation of laser sources that bridge the gap between industrial and academic requirements, combining high average power with ultrashort pulse capabilities. These advancements enable the integration of compact, adaptable front-end stages, making such lasers versatile for scientific applications. In Lisbon, the Laboratory of Intense Lasers leverages this technology with a system that combines commercial and custom-built front-end stages to enhance operational flexibility. In this paper, we present the current status of this facility and outline upcoming upgrades. We also showcase applications enabled by these high-power laser sources, including semiconductor studies, bi-photonics, and time-resolved spectroscopy.

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Multi-mJ Scaling of 5-Optical Cycle, 3 µm OPCPA

Cited by 3 publications

References 35 publications

Mid-infrared quasi-parametric chirped-pulse amplification based on Sm:LGN crystals

Mid-infrared quasi-parametric chirped-pulse amplification based on Sm:LGN crystals

Breakdown of the single-collision condition for soft x-ray high harmonic generation in noble gases

Multidisciplinary Laser Facility Driven by New-Generation High-Repetition Laser

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