What is it about?

Deep-UV coherent sources have great application prospects and exciting possibilities in numerous fields including laser physics, materials science, biomedicine, and industrial manufacturing. Based on the 1.1 μm laser radiation obtained by parametrically amplifying Yb:YAG laser using frequency doubling of Nd:YAG laser, a 220 nm deep-UV coherent source was systematically presented via the efficient fifth-harmonic generation in NH4H2PO4 (ADP) and KD2PO4 (DKDP) crystals.

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Why is it important?

The highest conversion efficiencies in ADP and DKDP crystals from 1101 nm laser radiation to 220 nm were 17.5% and 23.6%, respectively, and the results prove the effectiveness and feasibility of obtaining deep-UV laser radiation near 200 nm via the fifth-harmonic generation in KDP-family crystals.


This research shows that the fifth-harmonic generation of 1.1 μm laser with large angular acceptance in both ADP and DKDP crystals can be efficiently achieved near room temperature, which has important practical significance, and this work also paves the way for obtaining high-energy and high-peak-power deep-UV and even vacuum-UV laser sources based on KDP-family large-aperture crystals.

Zijian Cui
Shanghai Institute of Optics and Fine Mechanics

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This page is a summary of: 220 nm deep-UV coherent source based on fifth-harmonic generation in ADP and DKDP crystals, AIP Advances, November 2022, American Institute of Physics,
DOI: 10.1063/5.0124017.
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