Abstract

A comparative analysis of AgGaSe₂, GaSe, CdGeAs₂, and Te for second harmonic generation (SHG) of a picosecond CO₂ laser at intensities up to 50 GW/cm² is presented. We demonstrate external energy conversion efficiency of >20% in AgGaSe₂. Conversion efficiency >5% is measured in GaSe and CdGeAs₂. Self-focusing and multifilamentation are found to severely limit the SHG process in CdGeAs₂ and Te at such high fields. Demonstration of ≥150 MW SH pulses for a 10 $\mathrm{\mu}$m picosecond pump, in combination with femtosecond CO₂ laser development, will open new strong-field applications in the 4.5–5.5 $\mathrm{\mu}$m range.

© 2022 Optica Publishing Group

High-power, mid-infrared, picosecond pulses generated by compression of a CO₂ laser beat-wave in GaAs

J. J. Pigeon, S. Ya. Tochitsky, and C. Joshi
Opt. Lett. 40(24) 5730-5733 (2015)

10-µJ few-cycle 12-µm source based on difference-frequency generation driven by a 1-kHz mid-wave infrared OPCPA

Martin Duda, Lorenz von Grafenstein, Martin Bock, Dennis Ueberschaer, Pia Fuertjes, Lukáš Roškot, Martin Smrž, Ondřej Novák, and Uwe Griebner
Opt. Lett. 47(11) 2891-2894 (2022)

High-power 671 nm laser by second-harmonic generation with 93% efficiency in an external ring cavity

Xing-Yang Cui, Qi Shen, Mei-Chen Yan, Chao Zeng, Tao Yuan, Wen-Zhuo Zhang, Xing-Can Yao, Cheng-Zhi Peng, Xiao Jiang, Yu-Ao Chen, and Jian-Wei Pan
Opt. Lett. 43(8) 1666-1669 (2018)

High-efficiency second-harmonic generation in coupled nano Fabry–Perot thin resonators

Tomasz Matthia, Baptiste Fix, Léna Soun, Christophe Dupuis, Nathalie Bardou, and Patrick Bouchon
Opt. Lett. 47(17) 4415-4418 (2022)

Single-pass, second-harmonic generation of high-power, ultrafast mid-IR Cr²⁺:ZnS laser at 2360  nm

Anirban Ghosh, Deepika Yadav, and G. K. Samanta
Opt. Lett. 44(14) 3522-3525 (2019)